Convert m³, ft³, yd³, cm³, mm³, litres, US gallons, UK gallons & more — instantly. Built for concrete, earthwork, drainage, and construction estimates.
Volume conversion is one of the most frequent estimates performed on construction sites, in design offices, and by quantity surveyors working on concrete, earthwork, drainage, and civil engineering projects. Whether you are converting cubic metres of ready-mix concrete to cubic yards for a US supplier quote, estimating the volume of a soakaway in litres, or checking how many gallons of water a tank holds, this guide and conversion guide resource covers every unit you need.
This 2026 volume conversion guide covers all standard metric and imperial volume units — from cubic millimetres (mm³) used in precise engineering to cubic yards (yd³) used in earthwork and excavation — with full conversion factor tables, worked construction examples, and practical guidance on which units to use for different construction applications.
Concrete Volumes
Convert m³ to yd³ for ready-mix ordering, ft³ for small batches
Earthwork & Excavation
yd³ to m³ for bulk earthwork quantities and bulking estimates
Drainage & Tanks
Litres, gallons (US & UK), and m³ for tanks and drainage design
Precision Engineering
cm³, mm³, mL for precise material volumes and admixture dosing
Fluid Volumes
US/UK gallons, barrels, quarts for liquid material specifications
Full Reference Tables
Complete factor tables for all 12 volume units, metric and imperial
Why Volume Conversion Matters in Construction 2026
Construction projects in 2026 span multiple countries, standards, and unit systems. Accurate volume conversion is critical across concrete, earthworks, drainage, and procurement.
Ready-Mix Concrete Ordering
Ready-mix concrete is ordered in cubic metres (m³) in the UK and most of Europe, but in cubic yards (yd³) in the USA and some other markets. Incorrect conversion when comparing international supplier quotes or specifying cross-border projects can lead to significant over- or under-ordering.
Earthwork Cut and Fill
Excavation and earthwork volumes are estimated in m³ (metric) or yd³ (imperial). The relationship between cut volume (in-situ) and fill or disposal volume (loose or compacted) depends on the material bulking or shrinkage factor — a critical estimate for any civil engineering project.
Drainage and Hydraulics
Surface water storage volumes, soakaway design (BS EN 752), attenuation tank sizing, and pipe flow estimates use litres and m³. Water treatment and pump specifications often use US gallons or gallons per minute (GPM). Accurate conversion between litres and gallons is essential for procurement of imported equipment.
Admixture and Chemical Dosing
Concrete admixtures, waterproofing compounds, and chemical products are often dosed in litres per m³ of concrete or millilitres per kg of cement. Converting these dosage rates to the volumes needed for a specific pour — or to imperial measures for US product data sheets — requires precise unit conversion.
International Projects and Procurement
In 2026, construction procurement is increasingly global. Plant, tanks, and prefabricated elements are sourced from the US, Middle East, and Asia — all with different unit conventions. Volume unit errors in procurement specifications have caused costly delivery errors and delays on major international projects.
Bills of Quantities and Cost Plans
Quantity surveyors in the UK measure concrete and earthwork in m³ per RICS New Rules of Measurement (NRM2). International projects may use ft³ or yd³. Converting between measurement systems accurately is essential for producing compliant Bills of Quantities and comparing tender returns from contractors working in different unit systems.
Volume Unit Conversion — Base Formula and Key Relationships
All volume unit conversions use a single multiplication factor. Understanding the base relationships makes conversion quick and reliable.
Volume Conversion Formula
Result = Input Value × Conversion Factor
All volume conversions are direct multiplications— there is no offset or additive constant (unlike temperature conversion). Simply multiply by the appropriate factor from the table below.
Most Important Construction Conversion Factors (FROM 1 m³):
1 m³ =1,000 litres(exact) | 1 m³ =1,000,000 cm³(exact)
1 m³ =35.3147 ft³1 m³ =1.30795 yd³
1 m³ =264.172 US gallons1 m³ =219.969 UK gallons
1 m³ =61,023.7 in³1 m³ =6.28981 oil barrels
Inverse — FROM 1 ft³ and 1 yd³:
1 ft³ =0.028317 m³=28.317 litres=7.4805 US gal
1 yd³ =0.764555 m³=764.555 litres=201.97 US gal=27 ft³(exact)
1 US gallon =3.78541 litres1 UK gallon =4.54609 litres
Complete Volume Conversion Factor Table 2026
Multiply the value in the left column unit by the factor shown to get the equivalent in the column unit. All factors are exact or rounded to 6 significant figures.
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- From ↓ To →: 1 m³; m³: 1; ft³: 35.3147; yd³: 1.30795; Litre (L): 1,000; US Gal: 264.172; UK Gal: 219.969; in³: 61,023.7
- From ↓ To →: 1 ft³; m³: 0.028317; ft³: 1; yd³: 0.037037; Litre (L): 28.3168; US Gal: 7.48052; UK Gal: 6.22884; in³: 1,728
- From ↓ To →: 1 yd³; m³: 0.764555; ft³: 27; yd³: 1; Litre (L): 764.555; US Gal: 201.974; UK Gal: 168.179; in³: 46,656
- From ↓ To →: 1 Litre (L); m³: 0.001; ft³: 0.035315; yd³: 0.001308; Litre (L): 1; US Gal: 0.264172; UK Gal: 0.219969; in³: 61.0237
- From ↓ To →: 1 US Gallon; m³: 0.003785; ft³: 0.133681; yd³: 0.004951; Litre (L): 3.78541; US Gal: 1; UK Gal: 0.832674; in³: 231
- From ↓ To →: 1 UK Gallon; m³: 0.004546; ft³: 0.160544; yd³: 0.005946; Litre (L): 4.54609; US Gal: 1.20095; UK Gal: 1; in³: 277.419
- From ↓ To →: 1 in³; m³: 0.0000164; ft³: 0.000579; yd³: 0.0000214; Litre (L): 0.016387; US Gal: 0.004329; UK Gal: 0.003605; in³: 1
- From ↓ To →: 1 cm³; m³: 0.000001; ft³: 0.0000353; yd³: 0.00000131; Litre (L): 0.001; US Gal: 0.000264; UK Gal: 0.000220; in³: 0.061024
- From ↓ To →: 1 mL; m³: 0.000001; ft³: 0.0000353; yd³: 0.00000131; Litre (L): 0.001; US Gal: 0.000264; UK Gal: 0.000220; in³: 0.061024
- From ↓ To →: 1 Oil Barrel; m³: 0.158987; ft³: 5.61458; yd³: 0.207947; Litre (L): 158.987; US Gal: 42; UK Gal: 34.9723; in³: 9,702
- From ↓ To →: 1 US Quart; m³: 0.000946; ft³: 0.033420; yd³: 0.001238; Litre (L): 0.946353; US Gal: 0.25; UK Gal: 0.208169; in³: 57.75
Cubic Metres to Cubic Feet Conversion Table — m³ to ft³ (2026)
The most commonly used volume conversion in UK-to-US construction projects. 1 m³ = 35.3147 ft³. Use this table for quick reference without estimate.
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- m³: 0.1 m³; ft³: 3.531 ft³; yd³: 0.131 yd³; Litres: 100 L; US Gal: 26.42 gal; UK Gal: 22.00 gal
- m³: 0.25 m³; ft³: 8.829 ft³; yd³: 0.327 yd³; Litres: 250 L; US Gal: 66.04 gal; UK Gal: 54.99 gal
- m³: 0.5 m³; ft³: 17.657 ft³; yd³: 0.654 yd³; Litres: 500 L; US Gal: 132.09 gal; UK Gal: 109.98 gal
- m³: 1 m³; ft³: 35.315 ft³; yd³: 1.308 yd³; Litres: 1,000 L; US Gal: 264.17 gal; UK Gal: 219.97 gal
- m³: 2 m³; ft³: 70.629 ft³; yd³: 2.616 yd³; Litres: 2,000 L; US Gal: 528.34 gal; UK Gal: 439.94 gal
- m³: 3 m³; ft³: 105.944 ft³; yd³: 3.924 yd³; Litres: 3,000 L; US Gal: 792.52 gal; UK Gal: 659.91 gal
- m³: 4 m³; ft³: 141.259 ft³; yd³: 5.232 yd³; Litres: 4,000 L; US Gal: 1,056.69 gal; UK Gal: 879.88 gal
- m³: 5 m³; ft³: 176.573 ft³; yd³: 6.540 yd³; Litres: 5,000 L; US Gal: 1,320.86 gal; UK Gal: 1,099.85 gal
- m³: 6 m³; ft³: 211.888 ft³; yd³: 7.848 yd³; Litres: 6,000 L; US Gal: 1,585.03 gal; UK Gal: 1,319.81 gal
- m³: 7 m³; ft³: 247.203 ft³; yd³: 9.156 yd³; Litres: 7,000 L; US Gal: 1,849.20 gal; UK Gal: 1,539.78 gal
- m³: 8 m³; ft³: 282.517 ft³; yd³: 10.464 yd³; Litres: 8,000 L; US Gal: 2,113.38 gal; UK Gal: 1,759.75 gal
- m³: 9 m³; ft³: 317.832 ft³; yd³: 11.771 yd³; Litres: 9,000 L; US Gal: 2,377.55 gal; UK Gal: 1,979.72 gal
- m³: 10 m³; ft³: 353.147 ft³; yd³: 13.080 yd³; Litres: 10,000 L; US Gal: 2,641.72 gal; UK Gal: 2,199.69 gal
- m³: 15 m³; ft³: 529.720 ft³; yd³: 19.619 yd³; Litres: 15,000 L; US Gal: 3,962.58 gal; UK Gal: 3,299.54 gal
- m³: 20 m³; ft³: 706.294 ft³; yd³: 26.159 yd³; Litres: 20,000 L; US Gal: 5,283.44 gal; UK Gal: 4,399.38 gal
- m³: 25 m³; ft³: 882.867 ft³; yd³: 32.699 yd³; Litres: 25,000 L; US Gal: 6,604.30 gal; UK Gal: 5,499.23 gal
- m³: 50 m³; ft³: 1,765.73 ft³; yd³: 65.398 yd³; Litres: 50,000 L; US Gal: 13,208.6 gal; UK Gal: 10,998.5 gal
- m³: 100 m³; ft³: 3,531.47 ft³; yd³: 130.795 yd³; Litres: 100,000 L; US Gal: 26,417.2 gal; UK Gal: 21,996.9 gal
- m³: 250 m³; ft³: 8,828.67 ft³; yd³: 326.988 yd³; Litres: 250,000 L; US Gal: 66,043.0 gal; UK Gal: 54,992.3 gal
- m³: 500 m³; ft³: 17,657.3 ft³; yd³: 653.975 yd³; Litres: 500,000 L; US Gal: 132,086 gal; UK Gal: 109,985 gal
- m³: 1,000 m³; ft³: 35,314.7 ft³; yd³: 1,307.95 yd³; Litres: 1,000,000 L; US Gal: 264,172 gal; UK Gal: 219,969 gal
Cubic Yards & Cubic Feet to Cubic Metres — ft³ & yd³ to m³ (2026)
Imperial to metric conversion reference — essential for reading US specifications and converting earthwork quantities. 1 yd³ = 0.764555 m³. 1 ft³ = 0.028317 m³.
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- 1 ft³ — 0.02832 m³ — 28.32 L — 1 yd³ — 0.7646 m³ — 764.6 L
- 2 ft³ — 0.05663 m³ — 56.63 L — 2 yd³ — 1.529 m³ — 1,529 L
- 3 ft³ — 0.08495 m³ — 84.95 L — 3 yd³ — 2.294 m³ — 2,294 L
- 4 ft³ — 0.11327 m³ — 113.3 L — 4 yd³ — 3.058 m³ — 3,058 L
- 5 ft³ — 0.14158 m³ — 141.6 L — 5 yd³ — 3.823 m³ — 3,823 L
- 10 ft³ — 0.28317 m³ — 283.2 L — 10 yd³ — 7.646 m³ — 7,646 L
- 20 ft³ — 0.56634 m³ — 566.3 L — 20 yd³ — 15.29 m³ — 15,291 L
- 27 ft³ — 0.76455 m³ — 764.6 L — 50 yd³ — 38.23 m³ — 38,228 L
- 50 ft³ — 1.41584 m³ — 1,416 L — 100 yd³ — 76.46 m³ — 76,456 L
- 100 ft³ — 2.83168 m³ — 2,832 L — 500 yd³ — 382.3 m³ — 382,278 L
- 250 ft³ — 7.07921 m³ — 7,079 L — 1,000 yd³ — 764.6 m³ — 764,555 L
- 500 ft³ — 14.1584 m³ — 14,158 L — 5,000 yd³ — 3,823 m³ — 3,822,775 L
Litres to Gallons Conversion Table — US & UK Gallons (2026)
Note: US and UK gallons are different. 1 US gallon = 3.785 litres. 1 UK (Imperial) gallon = 4.546 litres. Always specify which gallon is intended in international specifications.
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- Litres (L): 1 L; US Gallons (gal): 0.2642 US gal; UK/Imperial Gallons (gal): 0.2200 UK gal; m³: 0.001 m³; ft³: 0.03531 ft³; US Quarts: 1.0567 qt
- Litres (L): 5 L; US Gallons (gal): 1.321 US gal; UK/Imperial Gallons (gal): 1.100 UK gal; m³: 0.005 m³; ft³: 0.1766 ft³; US Quarts: 5.284 qt
- Litres (L): 10 L; US Gallons (gal): 2.642 US gal; UK/Imperial Gallons (gal): 2.200 UK gal; m³: 0.01 m³; ft³: 0.353 ft³; US Quarts: 10.57 qt
- Litres (L): 20 L; US Gallons (gal): 5.283 US gal; UK/Imperial Gallons (gal): 4.399 UK gal; m³: 0.02 m³; ft³: 0.706 ft³; US Quarts: 21.13 qt
- Litres (L): 25 L; US Gallons (gal): 6.604 US gal; UK/Imperial Gallons (gal): 5.499 UK gal; m³: 0.025 m³; ft³: 0.883 ft³; US Quarts: 26.42 qt
- Litres (L): 50 L; US Gallons (gal): 13.209 US gal; UK/Imperial Gallons (gal): 10.998 UK gal; m³: 0.05 m³; ft³: 1.766 ft³; US Quarts: 52.83 qt
- Litres (L): 100 L; US Gallons (gal): 26.417 US gal; UK/Imperial Gallons (gal): 21.997 UK gal; m³: 0.1 m³; ft³: 3.531 ft³; US Quarts: 105.67 qt
- Litres (L): 200 L; US Gallons (gal): 52.834 US gal; UK/Imperial Gallons (gal): 43.994 UK gal; m³: 0.2 m³; ft³: 7.063 ft³; US Quarts: 211.34 qt
- Litres (L): 500 L; US Gallons (gal): 132.086 US gal; UK/Imperial Gallons (gal): 109.985 UK gal; m³: 0.5 m³; ft³: 17.657 ft³; US Quarts: 528.34 qt
- Litres (L): 1,000 L; US Gallons (gal): 264.172 US gal; UK/Imperial Gallons (gal): 219.969 UK gal; m³: 1.0 m³; ft³: 35.315 ft³; US Quarts: 1,056.7 qt
- Litres (L): 2,000 L; US Gallons (gal): 528.344 US gal; UK/Imperial Gallons (gal): 439.938 UK gal; m³: 2.0 m³; ft³: 70.629 ft³; US Quarts: 2,113.4 qt
- Litres (L): 5,000 L; US Gallons (gal): 1,320.86 US gal; UK/Imperial Gallons (gal): 1,099.85 UK gal; m³: 5.0 m³; ft³: 176.57 ft³; US Quarts: 5,283.5 qt
- Litres (L): 10,000 L; US Gallons (gal): 2,641.72 US gal; UK/Imperial Gallons (gal): 2,199.69 UK gal; m³: 10.0 m³; ft³: 353.15 ft³; US Quarts: 10,567 qt
️ US vs UK Gallon Warning:The US gallon (3.785 L) and UK Imperial gallon (4.546 L) arenot the same— the UK gallon is approximately 20% larger. Always clarify which gallon is being used when working with US specifications, imported equipment datasheets, or international procurement. “Gallon” in a UK context means the Imperial gallon unless stated otherwise.
Volume Units in Construction — When to Use Each Unit
Different volume units are standard for different construction applications. Using the right unit for the context avoids confusion and errors.
Cubic Metres (m³) — The Standard Metric Construction Unit
Cubic metres are the standard unit for concrete volumes, earthwork, and all large construction quantities in the UK, Europe, Australia, and most of the world. Ready-mix concrete is ordered in m³ (minimum typical order 1 m³). Concrete pumps are rated in m³/hour. Earthwork cut and fill quantities in civil engineering Bills of Quantities (NRM2) are measured in m³. Drainage storage volumes for attenuation tanks and soakaways are estimated and specified in m³. Water storage tanks are specified in m³ or litres. Key relationship:1 m³ = 1,000 litres = 35.315 ft³ = 1.308 yd³.
Cubic Yards (yd³) — US Earthwork and Concrete Standard
Cubic yards are the standard unit for earthwork, concrete, and bulk material quantities in the USA, Canada, and some other markets. Ready-mix trucks in the US are typically 8–10 yd³. Earthwork haul distances and production rates are expressed in yd³ in US specifications. 1 yd³ = 0.7646 m³ = 27 ft³ (exactly) = 764.6 litres. When converting US earthwork quantities to metric for a UK or international project, multiply yd³ by 0.7646 to get m³. A common error is using 0.75 as an approximation — use 0.7646 for accuracy on large volumes. Seeearthwork estimating guidancefor production rate conversion.
Cubic Feet (ft³) — Small Concrete Batches and Residential
Cubic feet are used for small concrete volumes in the US and sometimes in the UK for bag-mix concrete products. A standard 25 kg bag of concrete mix typically yields approximately 0.01 m³ (10 litres) of concrete — equivalent to 0.353 ft³. Precast concrete products (kerbs, blocks, panels) may have their volumes stated in ft³ in US product literature. 1 ft³ = 0.02832 m³ = 28.32 litres = 7.48 US gallons. For bag concrete estimation: divide the required volume in ft³ by 0.45 to get the approximate number of 60 lb (27 kg) bags needed.
Litres (L) — Drainage, Admixtures, and Liquid Specifications
Litres are used for drainage design (soakaway volumes per BS EN 752, attenuation storage per Sewers for Adoption), concrete admixture dosing (litres per m³ of concrete or per 100 kg of cement), water demand per person (typically 150–200 litres/person/day in design), pump flow rates (litres per second, L/s), pipe flow capacities, and domestic water storage tanks. Key relationships: 1 litre = 1,000 mL = 0.001 m³ = 1 dm³ (exact). The density of water is 1.000 kg/litre at 4°C — meaning 1 litre of water = 1 kg, simplifying weight-to-volume conversions for water in structural and hydraulic estimates.
Gallons — Tanks, Pumps, and Fluid Storage
Gallons remain in common use for water storage tanks (rainwater harvesting, fire suppression, process water), pump selection (gallons per minute, GPM in US or gallons per hour, GPH in UK), fuel storage tanks, and bitumen/asphalt product specifications. In the UK, the Imperial gallon (4.546 litres) is standard; in the US, the US gallon (3.785 litres) is used. When specifying pump flow rates for imported US pump equipment, always convert GPM to L/s or m³/h: 1 US GPM = 0.0631 L/s = 0.227 m³/h. For UK pump specifications, 1 UK GPM = 0.0758 L/s. Always state “US gallons” or “Imperial gallons” explicitly in international specifications.
Worked Examples — Construction Volume Conversions 2026
Example 1: Ready-Mix Concrete Order — m³ to yd³
Structural slab dimensions 12.5m × 8.0m × 0.25m thick
Gross volume 12.5 × 8.0 × 0.25 = 25.0 m³
Add 5% waste/over-pour 25.0 × 1.05 = 26.25 m³ ordered
Convert to cubic yards (US supplier) 26.25 × 1.30795 = 34.33 yd³
Convert to cubic feet 26.25 × 35.315 = 927.0 ft³
Convert to litres 26.25 × 1,000 = 26,250 litres
Order 26.25 m³ | 34.33 yd³ | 927.0 ft³ | 26,250 litres
Example 2: Earthwork Excavation — yd³ to m³ with Bulking Factor
Excavation plan area 40m × 30m
Excavation depth 1.8m average
In-situ volume (bank measure) 40 × 30 × 1.8 = 2,160 m³
Soil bulking factor (clay) × 1.25 (clay bulks 25% when excavated)
Loose volume for haulage 2,160 × 1.25 = 2,700 m³ loose
Convert to yd³ (US contractor) 2,700 × 1.30795 = 3,531 yd³ loose
Truck capacity (15 yd³ per load) 3,531 ÷ 15 = 235 truck loads
2,160 m³ (bank) → 2,700 m³ loose → 3,531 yd³ → 235 truck loads
Example 3: Attenuation Tank Sizing — Litres to m³
Required storm storage (drainage design) 85,000 litres
Convert to m³ 85,000 ÷ 1,000 = 85.0 m³
Convert to US gallons 85.0 × 264.172 = 22,455 US gal
Convert to UK gallons 85.0 × 219.969 = 18,697 UK gal
Convert to yd³ 85.0 × 1.30795 = 111.2 yd³
Tank dimensions (3.0m dia. × L) Vol = π/4 × 3² × L → L = 85 ÷ 7.069 = 12.0m long
85 m³ | 85,000 L | 22,455 US gal | 18,697 UK gal | 111.2 yd³
Earthwork Bulking and Shrinkage Factors — Volume Conversion Guide 2026
Earthwork volumes change between the in-situ (bank), loose (excavated), and compacted states. Applying the correct factor is essential for accurate haulage estimation and fill design.
In-Situ (Bank) Volume
The volume of material as it exists undisturbed in the ground — the “bank cubic metre” or BCM. This is the starting point for all earthwork estimates and matches the excavation volume estimated from ground survey data. All other states are derived from bank volume by applying bulking or shrinkage factors. Used in Bills of Quantities and measured works valuation.
Loose (Excavated) Volume
Material expands when excavated — the “loose cubic metre” (LCM). Trucks are loaded by loose volume. The bulking factor converts bank volume to loose volume: Loose Volume = Bank Volume × Bulking Factor. Clay: 1.25–1.30 | Sand/gravel: 1.10–1.15 | Rock: 1.30–1.50 | Topsoil: 1.20–1.30. Incorrect bulking factors are one of the most common causes of cost overruns in earthwork contracts.
Compacted Fill Volume
Material placed and compacted in fill shrinks below its bank volume. The shrinkage factor converts bank volume to compacted fill volume. Shrinkage Factor = 1 ÷ Swell Factor. Clay: 0.85–0.90 | Sand/gravel: 0.95–1.00 | Rock: 1.05–1.15 (rock fills can be larger than bank due to voids). A shrinkage factor below 1.0 means more material is needed to achieve the required compacted volume — critical for fill design.
Clay — Typical Earthwork Factors
Bank → Loose (bulking): × 1.25 to 1.30. Bank → Compacted: × 0.85 to 0.90. Example: 1,000 m³ of clay (bank) → 1,250–1,300 m³ loose (truck loads) → 850–900 m³ compacted fill. Clay is the most common material in UK earthwork projects and requires the most careful factor selection — vary by plasticity and moisture content.
Sand & Gravel — Typical Earthwork Factors
Bank → Loose (bulking): × 1.10 to 1.15. Bank → Compacted: × 0.95 to 1.00. Granular materials have lower bulking factors than cohesive soils and can generally be placed as structural fill with minimal volume change. 1,000 m³ bank → 1,100–1,150 m³ loose → 950–1,000 m³ compacted. Widely used as engineered fill in foundations and road sub-bases.
Rock — Typical Earthwork Factors
Bank → Loose (bulking): × 1.30 to 1.50. Bank → Compacted fill: × 1.05 to 1.15 (rock fill is often bulkier than bank due to irregular fragment shape and voids). Rock excavation requires blasting or hydraulic breaking — significantly higher cost than soil excavation. The swell factor for rock must be agreed between client and contractor in the earthwork contract — see CIRIA C706 guidance.
Concrete Volume Estimate Guide — From Dimensions to m³ (2026)
Estimating concrete volume for common structural elements before converting to the required unit for ordering or cost estimation.
Slab or Raft Foundation Volume
Volume (m³) = Length (m) × Width (m) × Thickness (m). Example — 10m × 8m × 0.300m slab: 10 × 8 × 0.300 =24.0 m³. Convert: 24.0 × 1.308 = 31.39 yd³. Always add 5–10% over-order allowance for formwork inaccuracies, settlement, and waste. For stepped or irregular slabs, divide into regular rectangular zones and sum the volumes.
Column Volume (Circular)
Volume (m³) = π ÷ 4 × D² × H, where D = column diameter (m) and H = column height (m). Example — 600mm dia. × 4.5m high column: π/4 × 0.6² × 4.5 = 0.7854 × 0.36 × 4.5 =1.272 m³. For a rectangular column: Vol = Width × Depth × Height. For 12 identical columns: 12 × 1.272 = 15.26 m³ total — 15.26 × 1,000 = 15,260 litres.
Beam Volume
Volume (m³) = Width (m) × Depth (m) × Length (m). Example — 400mm × 600mm beam, 6.5m span: 0.4 × 0.6 × 6.5 =1.56 m³. Deduct the slab depth from beam depth if the slab is cast monolithically (beam acts as downstand). For T-beams, estimate the web and flange volumes separately. Total for 8 beams: 8 × 1.56 = 12.48 m³ = 16.33 yd³.
Pile Volume (Bored Concrete Pile)
Theoretical volume (m³) = π ÷ 4 × D² × L, where D = pile diameter and L = pile length. Example — 600mm dia. × 12m deep CFA pile: π/4 × 0.36 × 12 =3.393 m³theoretical. In practice, actual concrete used in CFA piles is typically 120–150% of theoretical volume due to overbreak and pile bulbing — always confirm with the specialist piling contractor for their assumed over-consumption factor. Convert to yd³: 3.393 × 1.308 = 4.44 yd³.
Retaining Wall Volume
For an L-shaped retaining wall: Volume = [(Base thickness × Base width) + (Wall stem width × Wall height)] × Wall length. Example — 600mm base, 2.4m wide; 350mm stem, 2.5m high; 20m long wall: [(0.6 × 2.4) + (0.35 × 2.5)] × 20 = [1.44 + 0.875] × 20 = 2.315 × 20 =46.3 m³= 60.6 yd³ = 46,300 litres. Always include kicker and haunch volumes in the actual pour estimate.
Ordering Allowances and Rounding
When placing a ready-mix concrete order: estimate net volume → add 5% minimum (10% for complex pours or those placed by pump) → round up to the nearest 0.5 m³ for orders under 10 m³, or nearest 1.0 m³ for larger orders. Ready-mix trucks typically carry 6–8 m³. Minimum loads are usually 3 m³ (with a short-load charge below this). Always confirm minimum order and delivery lead time with your ready-mix supplier — typically 24–48 hours notice required for standard mix delivery in 2026.
Pro Tips for Volume Conversion in Construction — 2026
Avoid the most common mistakes in volume unit conversion for concrete, earthwork, and drainage estimates.
Never Confuse US and UK Gallons
The US gallon (3.785 L) and UK Imperial gallon (4.546 L) differ by approximately 20%. Using the wrong gallon in a pump specification, tank estimate, or liquid admixture dosage estimate leads to significant errors. Always explicitly state “US gal” or “UK gal” in specifications. US equipment datasheets almost always use US gallons; UK and European datasheets use litres or Imperial gallons.
m³ = 1,000 Litres (Exact)
The conversion 1 m³ = 1,000 litres is exact by SI definition — no rounding error. Use this to quickly convert between the two most common metric volume units. A standard IBC (intermediate bulk container) holds 1,000 litres = 1.0 m³ exactly. A standard fire hydrant flow rate is typically 22.5–27.3 m³/hour = 22,500–27,300 litres/hour.
1 yd³ = 27 ft³ Exactly
Since 1 yard = 3 feet exactly, 1 yd³ = 3³ = 27 ft³ (exact). This is a useful check when converting between these two imperial units. For US concrete batching: a standard US mixer truck holds approximately 9–10 yd³ = 243–270 ft³ = 6.88–7.65 m³. Knowing these relationships allows quick sanity-checking of volume estimates in the field.
Always Apply Bulking Before Haulage Estimate
Excavated soil volume (for truck loading and disposal quantities) is always GREATER than the in-situ excavation volume because soil expands when disturbed. Never estimate truck loads from bank (in-situ) volume — always multiply by the bulking factor first. For clay at 1.25× bulking: 1,000 m³ excavation = 1,250 m³ of truck loads. Using bank volume for haulage underestimates truck numbers by 20–50% depending on material.
Add Over-Order Allowance to Concrete
Always order more concrete than the theoretical net volume. Minimum 5% over-order for straightforward pours with good formwork; 7–10% for complex shapes, pump losses, sloped ground, or wet/contaminated subgrades that may absorb water. Running short of concrete mid-pour — particularly for slabs — creates cold joints that can compromise structural integrity and are expensive to remedy.
1 Litre of Water = 1 kg (at 20°C)
The density of water at 20°C is approximately 0.9982 kg/litre — close enough to 1.000 for construction purposes. This means water volumes in litres convert directly to mass in kilograms without a separate density factor. For concrete water-cement ratio estimates, 180 litres of mixing water = 180 kg. For admixture dosing, 5 litres of liquid admixture ≈ 5–6 kg depending on the admixture specific gravity (typically 1.0–1.2).
Round Up, Never Down, for Concrete Orders
When finalising a ready-mix order, always round up to the nearest practical order increment — typically 0.5 m³ or 1.0 m³. The cost of one extra half-cubic metre is minimal compared to the cost of a short pour, emergency top-up truck, cold joint, or failed inspection. Discuss minimum load and short-load charges with your supplier — some suppliers charge premium rates for loads under 4–5 m³.
Concrete admixture dosage rates are specified per m³ of concrete or per 100 kg of cement — typically in litres. For a 25 m³ pour with a plasticiser dosed at 0.8 litres/100 kg cement, and a cement content of 380 kg/m³: Admixture per m³ = 0.008 × 380 = 3.04 litres/m³. Total admixture = 3.04 × 25 = 76.0 litres = 0.076 m³ = 20.1 US gallons. Always confirm the admixture quantity with your concrete supplier or technologist before ordering.
Quick Reference Volume Conversion Cards — 2026
The most commonly needed volume conversion factors for construction, earthwork, drainage, and concrete work — all in one place.
m³ → ft³
ft³ = m³ × 35.3147
Example: 5 m³ × 35.3147 = 176.6 ft³
ft³ → m³
m³ = ft³ × 0.028317
Example: 100 ft³ × 0.028317 = 2.832 m³
m³ → yd³
yd³ = m³ × 1.30795
Example: 50 m³ × 1.30795 = 65.40 yd³
yd³ → m³
m³ = yd³ × 0.764555
Example: 100 yd³ × 0.764555 = 76.46 m³
Litres → m³
m³ = Litres ÷ 1,000
Example: 25,000 L ÷ 1,000 = 25.0 m³
m³ → Litres
Litres = m³ × 1,000
Example: 85 m³ × 1,000 = 85,000 litres
m³ → US Gallons
US gal = m³ × 264.172
Example: 10 m³ × 264.172 = 2,642 US gal
m³ → UK Gallons
UK gal = m³ × 219.969
Example: 10 m³ × 219.969 = 2,200 UK gal
Litres → US Gallons
US gal = L × 0.264172
Example: 500 L × 0.264172 = 132.1 US gal
US Gallons → Litres
L = US gal × 3.78541
Example: 100 US gal × 3.78541 = 378.5 L
UK Gallons → Litres
L = UK gal × 4.54609
Example: 100 UK gal × 4.54609 = 454.6 L
in³ → cm³ (= mL)
cm³ = in³ × 16.3871
Example: 10 in³ × 16.3871 = 163.9 cm³
Volume Conversion Glossary — Key Terms 2026
Definitions of all volume units and related terms used in construction, concrete, earthwork, and drainage engineering in 2026.
Cubic Metre (m³)
The SI base unit of volume. Defined as the volume of a cube with sides of exactly 1 metre. 1 m³ = 1,000 litres = 1,000,000 cm³. The standard unit for concrete, earthwork, and large liquid volumes in metric practice worldwide.
Cubic Foot (ft³)
Imperial volume unit — the volume of a cube with sides of 1 foot (12 inches). 1 ft³ = 0.028317 m³ = 28.317 litres = 1,728 in³. Widely used in the US for concrete volumes and in UK residential construction for bag concrete estimation.
Cubic Yard (yd³)
Imperial volume unit — the volume of a cube with sides of 1 yard (3 feet = 36 inches). 1 yd³ = 27 ft³ (exact) = 0.764555 m³ = 764.555 litres. Standard unit for ready-mix concrete and earthwork in the USA and Canada.
Litre (L or l)
Metric unit of volume defined as 1 dm³ (cubic decimetre) = 0.001 m³. 1 litre of water at 4°C has a mass of exactly 1 kg. The standard unit for drainage design, liquid admixtures, water storage, and pump flow rates in metric practice.
US Gallon (gal)
US customary unit of volume = 3.78541 litres = 231 in³ (exact). Not the same as the UK Imperial gallon. Used for concrete, liquid volumes, and pump rates in the USA. 1 US GPM (gallon per minute) = 0.0631 litres per second.
UK/Imperial Gallon (gal)
UK Imperial unit of volume = 4.54609 litres = 277.4 in³. Approximately 20% larger than the US gallon. Still used in UK for tank volumes, fuel, and some pump specifications. 1 UK GPM = 0.0758 litres per second.
Millilitre (mL)
1 mL = 0.001 litre = 1 cm³. Used for small liquid volumes — admixture samples, laboratory water measurements, and precise dosing in concrete mix design. 1,000 mL = 1 litre (exact). Equivalent to 1 cubic centimetre (cm³).
Cubic Centimetre (cm³)
1 cm³ = 0.001 litre = 1 mL (exact). Used in precise engineering, material property testing, and admixture dosing. 1 m³ = 1,000,000 cm³. Used in concrete mix design estimates when working at the material constituent level (e.g. aggregate specific gravity testing).
Bank Cubic Metre (BCM)
Volume of material measured in its undisturbed, in-situ state in the ground. The standard measure for earthwork Bills of Quantities. Differs from loose and compacted volume by the bulking/shrinkage factor of the material.
Loose Cubic Metre (LCM)
Volume of material measured after excavation — in its disturbed, expanded state ready for loading into trucks. LCM = BCM × Bulking Factor. Used for estimating truck load quantities, productivity rates, and plant selection for earthwork operations.
Bulking Factor
The ratio of loose volume to bank volume for an excavated soil or rock material. Always greater than 1.0 — material always expands when excavated. Clay: 1.25–1.30. Gravel: 1.10–1.15. Rock: 1.30–1.50. Used to estimate haulage quantities from excavation quantities.
Shrinkage Factor
The ratio of compacted fill volume to bank volume. Usually less than 1.0 for cohesive soils — more bank material is needed than the final compacted volume. Clay: 0.85–0.90. Gravel: 0.95–1.00. Used to estimate the import volume required to achieve a specified compacted fill volume.
Oil Barrel (bbl)
A unit of liquid volume used in the petroleum industry. 1 bbl = 42 US gallons = 158.987 litres = 0.158987 m³. Not typically used in structural construction but relevant when specifying bitumen, tar, or fuel storage on civil infrastructure projects.
Flow Rate — L/s, m³/h, GPM
Volume per unit time — used for pump selection and drainage design. 1 m³/h = 0.2778 litres/second. 1 US GPM = 0.0631 L/s = 0.2271 m³/h. 1 UK GPM = 0.0758 L/s = 0.2728 m³/h. Surface water runoff rates in UK drainage design (BS EN 752) are typically expressed in litres per second (L/s).
Frequently Asked Questions — Volume Conversion 2026
How many cubic feet are in 1 cubic metre?
There are35.3147 cubic feet (ft³) in 1 cubic metre (m³). To convert m³ to ft³, multiply by 35.3147. To convert ft³ to m³, multiply by 0.028317. Example: 5 m³ × 35.3147 = 176.6 ft³. This is the most commonly used volume conversion in UK-to-US construction project work — for example, when converting a concrete specification from metric to imperial for US procurement. Use the conversion guide resource at the top of this page for instant results.
How many cubic yards are in 1 cubic metre?
There are1.30795 cubic yards (yd³) in 1 cubic metre (m³). To convert m³ to yd³, multiply by 1.30795. To convert yd³ to m³, multiply by 0.764555. Example: 25 m³ of concrete = 25 × 1.30795 = 32.70 yd³. This conversion is essential when ordering ready-mix concrete from US suppliers or interpreting US-standard earthwork specifications. Note: 1 yd³ = 27 ft³ exactly (since 1 yard = 3 feet).
How many litres are in 1 cubic metre?
There are exactly1,000 litres in 1 cubic metre— this is an exact SI definition with no rounding. 1 m³ = 1,000 L = 1,000,000 mL = 1,000,000 cm³. This makes conversion between m³ and litres trivial: simply multiply or divide by 1,000. For example, a 50,000 litre water storage tank = 50 m³. Attenuation tank storage of 85,000 litres = 85 m³. Concrete water content of 195 litres/m³ = 0.195 m³ of water per cubic metre of concrete.
What is the difference between US and UK gallons?
The US gallon =3.78541 litres. The UK Imperial gallon =4.54609 litres. The UK gallon is approximately20% largerthan the US gallon. This difference is significant in practice — a 500 US gallon tank holds 1,893 litres, while a 500 UK gallon tank holds 2,273 litres. Always specify “US gal” or “UK gal” in any specification or estimate involving gallons. US product datasheets, equipment manuals, and pump curves always use US gallons unless explicitly stated otherwise.
How do I convert cubic metres to gallons for a water storage tank?
To convert m³ to US gallons: multiply by264.172. To convert m³ to UK gallons: multiply by219.969. Example: A 10 m³ water storage tank holds 10 × 264.172 =2,642 US gallonsor 10 × 219.969 =2,200 UK gallons. For reverse: US gallons to m³ — multiply by 0.003785. UK gallons to m³ — multiply by 0.004546. Use the live conversion guide resource at the top of this page to convert any volume instantly between all 12 units.
How much does 1 m³ of concrete weigh?
The fresh density of normal-weight structural concrete is approximately2,300–2,450 kg/m³depending on the mix design. A typical M25 design mix (400 kg cement, 400 kg sand, 800 kg aggregate, 200 L water) gives a theoretical fresh density of approximately 1,800 kg/m³ — however this increases to around 2,350 kg/m³ when aggregate is correctly accounted for. Lightweight concrete: 1,400–1,800 kg/m³. Heavyweight concrete (for radiation shielding): 3,000–4,000 kg/m³. Hardened concrete self-weight for design purposes per Eurocode 1:24 kN/m³ (reinforced = 25 kN/m³).
How do I estimate earthwork volumes with bulking?
Step 1: Estimate in-situ (bank) volume from survey data. Step 2: Apply bulking factor to get loose volume for haulage:Loose Volume = Bank Volume × Bulking Factor. Step 3: Estimate number of truck loads: Loads = Loose Volume ÷ Truck Capacity. Step 4: For fill design, apply shrinkage factor:Required Import Volume = Fill Volume ÷ Shrinkage Factor. Example: 500 m³ excavation in clay (bulking factor 1.25, shrinkage factor 0.88): Loose for haulage = 500 × 1.25 = 625 m³ (truck loads). If used as fill: 500 × 0.88 = 440 m³ compacted fill from this material. See theCIRIA earthwork guidancefor material-specific factor tables.
What volume unit is used for concrete in the UK in 2026?
In the UK in 2026, concrete is universally measured and ordered incubic metres (m³). Ready-mix concrete is ordered by the cubic metre, with minimum loads typically 1–3 m³ depending on the supplier. Truck capacities are typically 6–8 m³. Concrete mix design quantities are expressed per m³ (kg/m³ for cement and aggregates; litres/m³ for water and admixtures). Bills of Quantities for concrete work (NRM2, CESMM4) are measured in m³. The only context where other units appear is on small DIY projects using bag concrete (sometimes expressed in bags per project) or when comparing with US specifications (yd³).
Disclaimer — Volume Conversion guide 2026
Conversion Accuracy
All conversion factors used in this resource and reference tables are based on internationally recognised definitions accurate to at least 6 significant figures. The conversion 1 m³ = 1,000 litres, 1 yd³ = 27 ft³, and 1 US gallon = 231 in³ are exact by definition. Other factors (m³ to ft³, m³ to yd³, litres to gallons) are derived from these exact definitions and rounded to 6 significant figures. Rounding differences of less than 0.01% may occur at very high or very low values. Always carry sufficient significant figures in intermediate estimates for engineering-critical work.
Not a Substitute for Professional Engineering Estimates
Volume conversion results from this resource are for reference and guidance only. For safety-critical structural estimates, legal measurement of earthwork quantities, commercial concrete ordering, and regulatory drainage design, volume estimates must be carried out or verified by a qualified engineer or quantity surveyor using formally approved methods and survey data. The authors accept no liability for errors arising from the use of this conversion guide resource or the reference tables on this page.
Standards and Definitions Current as of May 2026
Unit definitions used in this guide are aligned with the International System of Units (SI, 9th Edition, 2019), the UK Weights and Measures Act 1985 (as amended), and NIST Special Publication 1038 (US measurement standards). Volume measurement standards for concrete (BS EN 12350-6) and earthwork (CESMM4, NRM2) are referenced as current in May 2026. Always confirm measurement standards with your contract documents and the applicable national measurement rules for your project.