Terms of service - ConcretesMath

Please read these terms carefully before using ConstructionCalc’s free construction guides, resources, and PDF report generators.

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Effective:1 January 2026

Updated:24 May 2026

By using our articles or resources you agree to these terms. If you disagree, please do not use our services.

Important Notice — Read Before Using

ConstructionCalc’s guides and resources are provided forgeneral informational and estimation purposes only. All results must be verified by a qualified structural engineer, quantity surveyor, or other licensed professional before being used for procurement, construction, tendering, or any other purpose.Never rely solely on guide outputs for structural engineering decisions.

Acceptance of Terms

These Terms of Service (“Terms”) constitute a legally binding agreement between you (“User”, “you”, or “your”) and ConstructionCalc (“we”, “us”, “our”, or “ConstructionCalc”) governing your access to and use of the website located at ConstructionCalc.com, including all guides, resources, report generators, reference guides, and other content and services made available on or through the website (collectively, the “Services”).

By accessing or using any part of the Services — including but not limited to loading any guide page, entering values, generating results, downloading a PDF report, or reading any reference content — you acknowledge that you have read, understood, and agree to be bound by these Terms in their entirety. If you do not agree to these Terms, you must immediately stop using the Services.

If you are accessing the Services on behalf of an organisation, company, or other legal entity, you represent and warrant that you have the authority to bind that entity to these Terms, and references to “you” in these Terms shall refer to that entity. If you do not have such authority, you must not use the Services on behalf of that entity.

Description of Services

ConstructionCalc provides a suite of free online resources designed to assist construction professionals, quantity surveyors, engineers, contractors, and self-builders with common construction estimates and documentation. The Services currently include, but are not limited to, the following resources:

All Services are provided free of charge and without requirement for user registration, account creation, or payment. We reserve the right to add, modify, suspend, or discontinue any Service or feature at any time without notice or liability to you.

The Services are made available on an “as is” and “as available” basis. We do not guarantee continuous, uninterrupted, or error-free access to the Services. We accept no responsibility for any downtime, service interruption, or loss of access.

Permitted Use & Restrictions

3.1 Permitted Uses

Subject to your compliance with these Terms, we grant you a limited, non-exclusive, non-transferable, revocable licence to access and use the Services for the following purposes:

Personal, non-commercial use for construction estimation, planning, and reference purposes
Professional use by engineers, quantity surveyors, contractors, and construction professionals as a computational aid and reference resource — subject always to independent professional verification of all results
Educational use by students and academics studying civil engineering, construction management, and related disciplines
Generation and download of PDF reports for use within your own project documentation and quality records
Sharing links to our guides with colleagues, clients, or on professional platforms

3.2 Prohibited Uses

You must not use the Services in any manner that:

Violates any applicable local, national, or international law or regulation
Involves scraping, crawling, or automatically harvesting content, data, or results from our website without prior written permission
Attempts to reverse-engineer, decompile, disassemble, or derive the source code of our guides or resources
Involves framing, embedding, or incorporating our guides or resources within another website or application without prior written permission
Misrepresents worked estimates as the output of your own proprietary estimate resource or software
Uses automated systems (bots, scripts, or otherwise) to access or interact with the Services
Transmits any viruses, malware, or other harmful code to or through our website
Attempts to gain unauthorised access to any part of our systems, servers, or networks
Uses the Services in a way that could damage, disable, overburden, or impair our servers or the experience of other users
Removes, obscures, or alters any copyright, trademark, or other proprietary notices from any content downloaded from the Services

Disclaimer of Warranties

TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, THE SERVICES AND ALL CONTENT, RESULTS, ESTIMATES, REPORTS, AND OTHER MATERIALS AVAILABLE THROUGH OR IN CONNECTION WITH THE SERVICES ARE PROVIDED ON AN“AS IS”AND“AS AVAILABLE”BASIS, WITHOUT ANY WARRANTIES OF ANY KIND, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE.

WITHOUT LIMITING THE FOREGOING, WE EXPRESSLY DISCLAIM ALL WARRANTIES INCLUDING, BUT NOT LIMITED TO:

Accuracy and Completeness:We do not warrant that any estimate result, reference value, price estimate, material quantity, or other output is accurate, complete, current, or suitable for any particular purpose
Fitness for Purpose:We do not warrant that the Services are fit for any specific construction, engineering, procurement, tendering, or legal purpose
Uninterrupted Access:We do not warrant that access to the Services will be continuous, error-free, or virus-free
Results of Use:We do not warrant that any particular result will be achieved by using the Services, or that the results obtained from using the Services will be accurate or reliable
Reference Data Currency:We do not warrant that any reference data (material prices, concrete grade parameters, admixture dosage ranges, standard values) is current as of the date you access it. Market conditions change frequently
Compliance with Standards:While we design our guides and reports to align with published engineering standards (IS 456, IS 516, ASTM C494, etc.), we do not warrant that any worked example or generated report will satisfy all requirements of any specific standard, project specification, or regulatory requirement

Some jurisdictions do not allow the exclusion of certain warranties. In such jurisdictions, the above exclusions may not apply to you to the extent required by applicable law, and our liability will be limited to the greatest extent permitted.

No Professional Engineering or Technical Advice

This section contains critically important limitations that you must understand before using our Services for any construction, engineering, or procurement purpose.

5.1 Not a Substitute for Professional Engineering Judgement

All worked estimates, reference data, grade recommendations, material quantities, cost estimates, and other outputs from our Services arecomputational estimates and informational references only. They are not, and must not be treated as, a substitute for the independent professional judgement of a qualified and licensed:

Structural or civil engineer (for structural element sizing, concrete grade selection, reinforcement design, and load-bearing estimates)
Geotechnical engineer (for foundation design and soil-bearing capacity assessment)
Quantity surveyor or cost consultant (for formal Bill of Quantities, tender pricing, contract valuation, or official cost estimates)
Materials technologist or concrete technologist (for concrete mix design, admixture selection, and quality control)
Architect or building designer (for compliance with building codes, bye-laws, and planning requirements)
Contractor or sub-contractor (for method statements, construction sequencing, and site safety)

5.2 Mandatory Professional Verification

Before using any worked example, reference value, cost estimate, or generated PDF report for any of the following purposes, youmusthave the results independently reviewed and verified by a suitably qualified and licensed professional:

Structural design, sizing, or specification of any load-bearing concrete element
Concrete procurement and ready-mix ordering where an incorrect volume could cause a structural defect (cold joint, under-strength concrete)
Formal tender preparation, bill of quantities, or contract pricing documents
Regulatory submissions, building permit applications, or compliance certification
Dispute resolution, expert witness reports, or legal proceedings
Insurance valuation or reinstatement cost assessment
Safety-critical decisions relating to formwork loading, concrete placement rates, or construction sequencing

5.3 Admixture and Material Selection

Our Admixture Dosage Guide and related resources provide indicative dosage ranges based on published manufacturer guidance and industry standards. Actual admixture selection, dosage, and compatibility for any specific concrete mix must be confirmed through laboratory trial mixes and approved by a qualified concrete technologist or materials engineer before use on structural works. Admixture overdosage can result in complete concrete failure, and we accept no liability for any such outcome.

5.4 Material Prices and Cost Estimates

All material price ranges shown in our cost guide and reference tables are indicative market estimates based on publicly available data at the time of our last update. Actual prices vary significantly by region, season, supplier, purchase volume, and market conditions.All prices must be verified directly with your local suppliers before being used in any formal estimate, tender, or budget document.

Published Estimates & Methodology

We take great care to ensure that the mathematical formulas and unit conversions implemented in our guides are correct. All arithmetic is performed using IEEE 754 double-precision floating-point arithmetic, providing 15–17 significant digits of internal precision. Results are rounded for display purposes only, and no rounding occurs during intermediate estimate steps.

6.1 What Our Accuracy Guarantee Covers

Our accuracy guarantee covers themathematical correctnessof our estimates — that is, the arithmetic operations performed on the values you enter produce the mathematically correct result based on the formulas we have implemented. The formulas used are the widely accepted industry standard formulas referenced in IS 456, IS 10262, IS 516, ASTM C494, ACI 212.3R, and BS EN 934-2, as applicable to each guide.

6.2 What Our Accuracy Guarantee Does Not Cover

Our accuracy guarantee does not cover:

Thesuitability or appropriatenessof any specific concrete grade, admixture dosage, reinforcement ratio, or element size for your project — these are professional engineering judgements
Theaccuracy of reference datashown in tables (bags per m³, dosage ranges, material prices, concrete grade properties) — these are indicative values that may differ from your specific project’s approved mix design, market conditions, or manufacturer’s recommendations
Results arising fromincorrect values entered by the user— garbage in, garbage out applies to all guides
Thecompletenessof estimates — our guides estimate only what they are designed to estimate; they do not account for factors not included in their scope (e.g., reinforcement deduction, complex geometric shapes outside the supported types)
Design mix proportions for M30 and above— the material quantities shown for M30+ grades are indicative estimates; actual proportions must be determined by laboratory design mix per IS 10262:2019

For full details of our accuracy methodology, verification estimates, and the scope of our accuracy commitment, please read ourAccuracy Guarantee page.

Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL CONSTRUCTIONCALC, ITS OWNERS, OPERATORS, EMPLOYEES, CONTRACTORS, AGENTS, LICENSORS, OR SERVICE PROVIDERS BE LIABLE FOR ANY:

Direct damages— including but not limited to the cost of concrete or materials ordered in excess or deficit due to reliance on guide outputs without professional verification
Indirect or consequential damages— including loss of profits, loss of business, loss of data, loss of goodwill, or any other indirect or consequential losses
Structural or construction defects— including but not limited to cold joints, under-strength concrete, incorrectly specified grades, inadequate reinforcement, or any other structural issue arising from reliance on our guide outputs without professional verification
Cost overruns— arising from reliance on our material cost guide or price reference tables without obtaining current local supplier quotes
Project delays— caused by procurement errors, incorrect quantities, or material shortfalls arising from reliance on our guides
Personal injury, property damage, or death— resulting directly or indirectly from reliance on any worked example, reference value, or generated report without appropriate professional review and verification
Regulatory non-compliance— arising from use of our resources in preparing compliance submissions or certifications
Loss of data— including loss of any data entered into our guides or generated reports (since we do not store user data, no recovery is possible)

THE ABOVE LIMITATION OF LIABILITY APPLIES WHETHER THE CLAIMED LIABILITY IS BASED ON CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY, OR ANY OTHER LEGAL OR EQUITABLE THEORY, AND EVEN IF WE HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

TO THE EXTENT THAT ANY JURISDICTION DOES NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES, THE ABOVE LIMITATION MAY NOT APPLY TO YOU. IN SUCH CASES, OUR AGGREGATE LIABILITY SHALL BE LIMITED TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW.

BECAUSE OUR SERVICES ARE PROVIDED FREE OF CHARGE, AND TO THE FULLEST EXTENT PERMITTED BY LAW, OUR TOTAL AGGREGATE LIABILITY TO YOU FOR ALL CLAIMS ARISING OUT OF OR RELATING TO THESE TERMS OR YOUR USE OF THE SERVICES SHALL NOT EXCEED THE AMOUNT YOU PAID US IN THE TWELVE MONTHS PRECEDING THE CLAIM — WHICH IN THE CASE OF OUR FREE SERVICES IS ZERO (0).

Intellectual Property

8.1 Our Content

The Services and all content, features, and functionality — including but not limited to all text, graphics, user interface design, logos, guide code and logic, PDF report templates, layout and formatting, reference tables, explanatory content, and documentation — are owned by ConstructionCalc or its licensors and are protected by applicable copyright, trademark, and other intellectual property laws.

8.2 Limited Licence to You

Subject to these Terms, we grant you a limited, personal, non-exclusive, non-sublicensable, non-transferable, revocable licence to access and use the Services for your own lawful purposes. This licence does not include any right to:

Copy, reproduce, or distribute the source code, guide logic, or user interface of our resources for any purpose other than your own personal or professional use
Publish, broadcast, or publicly display our content on any other website, platform, or media without our prior written permission
Create derivative works based on our guide designs, report templates, or proprietary content
Sell, sublicense, or otherwise commercially exploit any part of the Services or our content

8.3 Permitted Sharing

You may share links to our individual guide pages on social media, professional forums, email, or messaging applications. You may include brief quotations from our reference material (properly attributed to ConstructionCalc.com) in reports, articles, or educational materials. You may not reproduce substantial portions of our content without our express written consent.

8.4 Your Generated Content

PDF reports generated using our Report Generator resource using data you input are your own documents. We claim no ownership over the specific project data, test results, or other information you enter into our resources or include in generated reports. However, the underlying report template design, formatting, structure, and layout remain our intellectual property.

8.5 Feedback

If you provide us with any feedback, suggestions, or ideas regarding the Services, you grant us a perpetual, irrevocable, worldwide, royalty-free, fully paid-up licence to use, reproduce, modify, and incorporate that feedback into the Services without any compensation or attribution obligation to you.

Privacy & User Data

When you close the browser tab or navigate away, all data you have entered is permanently lost. We have no means of recovering any data entered into our resources after the browser session ends.

9.2 Website Analytics

We may use standard web analytics resources (such as page view counters or anonymised traffic analytics) to understand how our website is used in aggregate. Any analytics data collected is anonymised and does not identify individual users or contain the data entered into our guides. Analytics data is used solely to improve the Services.

9.3 Cookies

Our website may use cookies or similar technologies for functional purposes such as maintaining your preferences during a session (e.g., the last selected unit system). We do not use tracking cookies for advertising or cross-site tracking purposes. By using the Services, you consent to the use of strictly necessary functional cookies.

9.4 No Account or Registration

We do not offer user account registration and do not collect personal information such as names, email addresses, or payment information for any purpose related to the free guides and resources. No login is required to use any feature of the Services.

9.5 Third-Party Services

Our website may load third-party libraries (such as JavaScript libraries from content delivery networks) necessary for certain features (for example, jsPDF for PDF generation). These third-party services may collect limited technical data (such as your IP address) in accordance with their own privacy policies. We are not responsible for the data practices of any third-party service.

Third-Party Links & References

The Services may contain links or references to third-party websites, publications, standards documents, manufacturer technical data sheets, or other external resources. These links and references are provided for information and convenience only. We do not control, endorse, or assume responsibility for the content, accuracy, legality, or practices of any third-party website or resource.

References to specific product brands, manufacturer names (such as Sika, BASF, Fosroc, Chryso, and others), or published standards (such as IS 456, IS 10262, ASTM C494, ACI 212.3R) are made for the purposes of identifying the source of reference data and do not constitute endorsement of those products, standards, or organisations. All trademarks referenced remain the property of their respective owners.

We are not responsible for and accept no liability for any loss, damage, or inconvenience caused by your use of or reliance on any third-party website, product, or resource referenced from our Services. Your access to and use of any third-party website is subject to that website’s own terms of service and privacy policy.

Changes to These Terms

We reserve the right to update, modify, or replace these Terms at any time at our sole discretion. When we make material changes to these Terms, we will update the “Last Updated” date at the top of this page. We may also, at our discretion, provide more prominent notice of significant changes.

Your continued use of the Services after any changes to these Terms are posted constitutes your acceptance of the updated Terms. If you do not agree to the updated Terms, you must stop using the Services. We recommend checking this page periodically to stay informed of any changes.

We may also, at any time and without notice to you:

Update, modify, correct, or remove any guide, resource, reference table, or other content within the Services
Add new guides, resources, or features to the Services
Suspend or discontinue any guide, resource, or the Services entirely
Update reference data (material prices, dosage ranges, grade parameters) to reflect current industry practice

Governing Law & Dispute Resolution

12.1 Governing Law

These Terms and any dispute or claim arising out of or in connection with them or their subject matter or formation (including non-contractual disputes or claims) shall be governed by and construed in accordance with the laws applicable in the jurisdiction in which ConstructionCalc is established, without regard to any conflicts of law principles that would apply the laws of any other jurisdiction.

12.2 Dispute Resolution

In the event of any dispute arising out of or in connection with your use of the Services or these Terms, the parties agree to first attempt to resolve the dispute informally by contacting us at the details provided in Section 13 below. We will endeavour to address your concern within 14 working days.

If an informal resolution cannot be reached within 30 days of the dispute being notified to us in writing, either party may pursue resolution through the courts of competent jurisdiction as determined by the governing law applicable under Section 12.1.

12.3 Severability

If any provision of these Terms is held by a court of competent jurisdiction to be invalid, illegal, or unenforceable, that provision shall be limited or eliminated to the minimum extent necessary so that these Terms shall otherwise remain in full force and effect and enforceable.

12.4 Entire Agreement

These Terms, together with ourAccuracy Guaranteeand any other policies incorporated by reference herein, constitute the entire agreement between you and ConstructionCalc with respect to your use of the Services and supersede all prior and contemporaneous understandings, agreements, representations, and warranties.

12.5 Waiver

Our failure to enforce any right or provision of these Terms shall not constitute a waiver of that right or provision. Any waiver of any provision of these Terms will be effective only if in writing and signed by an authorised representative of ConstructionCalc.

Contact Us

If you have any questions, concerns, or feedback about these Terms of Service, the Services, or any other matter, please contact us using the following details:

For questions about whether a specific use of our guides is appropriate for your project or falls within the permitted use described in Section 3, please contact us before using the Services for that purpose. We are happy to clarify the scope and limitations of any of our resources.

Terms Summary — Key Points

Free to use:All guides, resources, and reports are provided free of charge with no registration required.

For estimation only:All results are computational estimates. They must be verified by a qualified professional before use in structural design, procurement, tendering, or regulatory submissions.

Your data is private:All estimates happen in your browser. No data you enter is ever sent to our servers or stored anywhere.

No liability:To the maximum extent permitted by law, we accept no liability for loss, damage, or injury arising from reliance on our guide outputs without professional verification.

By using our site you agree:Continued use of any part of our website constitutes acceptance of these Terms in full.

Ready to Use Our Concrete Guides?

Now that you’ve read our Terms, explore our suite of free construction guides — designed to make everyday estimation faster, more accurate, and completely free.