Terms of Service

— Quick version

The short version.

If you only have a minute, here's what these terms boil down to:

• This site is free to use. There are no accounts, no payments, no contracts to sign.
• The calculators give estimates for ordering materials. They aren't structural design and don't replace a licensed engineer.
• You can use the calculators for personal and professional work, including paid client work. You just can't scrape, copy, or rebuild the site somewhere else.
• The content and code are ours. The numbers you type in are yours — we never see them.
• Don't try to hack the site, run automated abuse against it, or use it to harass other people. Standard rules.
• We provide the site "as is." Use the output with normal professional judgement. Our liability is limited to what's permitted by law where you live.
• If you live in the UK, EU, Australia, or Canada, your statutory consumer rights are unaffected. The "as is" wording above doesn't override them.

The rest of this page is the detailed version of those bullets, plus the formal language lawyers expect.

— 2 · Agreement

Agreeing to these terms.

By accessing or using concretecalculatorpro.net (the "Site"), you agree to be bound by these Terms of Service ("Terms"). If you don't agree with any part of them, please don't use the Site.

You don't have to click anything or sign anything for these Terms to apply — continuing to use the Site is how you accept them. This is sometimes called a "browsewrap" agreement. We've tried to make the rules easy to find: there's a link in the footer of every page, in the legal submenu of the main navigation, and in your country selector area.

If you're using the Site on behalf of a company or other entity, you're confirming you have authority to bind that entity, and "you" in these Terms means both you personally and that entity.

You must be old enough to enter a binding contract in your jurisdiction (typically 18, sometimes 16, depending on where you live) to use the Site. If you're younger than that, please use the Site with a parent or guardian.

— 3 · What we offer

What we provide.

The Site is a collection of free concrete-related calculators and reference content, covering slabs, footings, columns, blocks, costs, and material volumes. It also includes a Mix Guide that explains strength classes, mix ratios, and exposure classes for the US, UK, Australia, and Canada.

The calculators run entirely in your browser. You type in dimensions, and the page does the maths client-side. We don't store the numbers you enter, we don't share them anywhere, and we don't transmit them back to our servers. (See our Privacy Policy for the full data story.)

Content on the Site is reviewed by licensed engineers in each country we cover — credentials are visible on the calculator pages. The site is provided as a free reference resource. There is no charge to use it and there is no commercial transaction between you and us.

— 4 · Engineering disclaimer

What the calculators are — and what they aren't.

This matters because concrete work can fail in ways that hurt people. A slab that's too thin for its load can crack and trip someone. A footing that's too shallow can heave in winter and tilt a deck post into a child's swing set. A column with the wrong rebar can collapse under a roof load. We don't want anyone to read a number from one of our calculators and pour a structure that fails.

Here's how to use the Site responsibly:

• For ordering materials — totally fine. Use our cubic-yard or cubic-metre figures to call your ready-mix supplier or buy bags at the hardware store.
• For early-stage budgeting — fine. Get a sense of what a project will cost before you commit.
• For comparing options — fine. See how 4-inch vs 6-inch thickness, or 3,000 psi vs 4,000 psi, changes the order.
• For designing a load-bearing structure — no. Hire a P.E. (US), CEng MICE (UK), CPEng (Australia), or P.Eng (Canada) — or the local equivalent. They'll specify the right concrete grade, the actual rebar schedule, footing dimensions sized for your soil bearing capacity, and frost depth for your specific lot.
• For permit drawings — no. Building departments require stamped engineering drawings for any structure they need to approve. The output of a free online calculator isn't an acceptable substitute and shouldn't be submitted as one.

The calculators use widely accepted formulas (cubic-yard math, π × r² × H for columns, the stack-of-blocks rule for stairs, etc.), reference standards (ACI 318-19, BS 8500, AS 3600, CSA A23.1), and default values for things like rebar cover, frost depth, and bag yields. These defaults reflect typical residential and light-commercial conditions in each country. Your actual project may differ — and that's why an engineer needs to confirm it before anything structural is built.

If anyone on the Site has presented themselves as personally licensed in your jurisdiction (e.g. a reviewer named on a particular calculator page), that doesn't establish an engineer–client relationship between you and them. They reviewed the content of the page, not your specific project.

— 5 · Your licence

Your licence to use the Site.

Subject to these Terms, we grant you a personal, non-exclusive, non-transferable, revocable licence to access and use the Site for your own information and for your project planning — whether personal or professional.

You can:

• Use the calculators for your own building, renovation, or estimating work.
• Use the calculators while doing paid client work (a contractor estimating for a homeowner, a quantity surveyor preparing a tender, an engineer doing a quick check).
• Quote short passages from the content with attribution, the way you'd quote any web source.
• Link to the Site from anywhere — no permission required for inbound links.
• Print or save a page for your own reference.

You can't:

• Republish whole pages or large parts of the content on another website or in a product.
• Embed our calculators in another product (a third-party app, a contractor's website, a SaaS tool) without our written permission.
• Translate and re-host the content under a different brand.
• Use the Site or any part of it to train a machine-learning model without permission.
• Remove or obscure copyright notices or attribution.

If you'd like to do any of the things in the "can't" list — particularly for educational or non-commercial purposes — write to us. We're often happy to say yes; we just like to know.

— 6 · Acceptable use

Acceptable use.

The Site is available for honest, lawful use. Most people just open a calculator, type in dimensions, and get on with their day — that's the use case we built it for, and it works without any rules to memorise.

We ask that you use the Site in good faith — respect what it's for, don't try to game it for purposes it wasn't designed for, and don't make life harder for the next person who uses it.

— 7 · What's not allowed

What's not allowed.

While using the Site you agree not to do any of the following:

We may, in our reasonable discretion, block access from IP addresses or networks that violate these rules. We may also report serious abuse to your internet provider or law enforcement where the conduct rises to that level.

— 8 · Intellectual property

Intellectual property.

The Site as a whole — its name, branding, design, calculator code, written content, illustrations, and curation of reference material — is protected by copyright, trademark, and other intellectual property laws. Unless something is clearly marked as third-party content (the typeface, certain reference standards we link to, regulator websites we cite), it's ours.

Reference standards we cite (such as ACI 318, BS 8500, AS 3600, CSA A23.1) are owned by their respective standards bodies, and we cite them under fair use / fair dealing principles. We don't reproduce the standards themselves; we describe their requirements and link to the publishers.

The numbers you enter into the calculators are yours. We don't claim any rights over your project dimensions, your costs, or anything else you type in. As described in the Privacy Policy, the calculator inputs stay in your browser and never reach our servers.

If you believe content on the Site infringes your copyright, please send a notice in writing to the contact address below. Include enough detail for us to identify the work claimed to be infringed and the page or element you believe to be infringing. We respond to good-faith DMCA notices (and equivalents under UK, EU, AU, CA law) and will remove infringing material once we've confirmed the claim.

— 9 · Third-party links

Third-party links and services.

The Site links out to a number of external sources — building codes and standards (ACI, BS, AS, CSA, NBCC, NHBC), regulator websites, government publications, and the documentation pages of our service providers (Google's privacy policy, for example).

We link to these because they're useful and authoritative for the reader. We don't control them, we don't endorse everything on them, and we can't be responsible for changes to those sites after we linked. If a linked page becomes broken, out of date, or moves to a paywall, please tell us and we'll update the link.

If you click an external link and end up on another service, your use of that service is governed by their terms and privacy policy, not ours.

— 10 · No warranties

No warranties — the Site is provided "as is".

The Site is offered free of charge and provided "as is" and "as available". To the maximum extent permitted by law, we make no warranties, express or implied, about:

• The accuracy or completeness of the calculator output for any specific project.
• The fitness of the Site or its content for any particular purpose.
• The uninterrupted availability of the Site (servers go down sometimes; we restore them as quickly as we can).
• The absence of bugs, errors, or omissions in code or content.
• The currency of cited standards, codes, and prices, which change over time.

We work hard to keep the content accurate and current. The calculator pages list the date they were last reviewed, and we update them when codes change or pricing materially shifts. But codes and prices change in ways we can't always catch immediately, and the calculators can't know your specific site conditions. You're responsible for verifying any number that matters for safety or budget against current local information and, where appropriate, a licensed professional.

Nothing in this section limits any warranty or right that cannot be lawfully excluded — see the consumer-rights section below.

— 11 · Limitation of liability

Limitation of liability.

To the maximum extent permitted by applicable law, we (the site operator and anyone who contributed content) are not liable for:

• Indirect, incidental, special, consequential, or punitive damages of any kind.
• Lost profits, lost revenue, lost data, or business interruption.
• Loss arising from your use of, or inability to use, the Site or its calculators.
• Loss arising from any error in or omission from content.
• Loss arising from your reliance on an estimate that should have been independently confirmed by a licensed professional.

Because the Site is provided free of charge and there is no commercial transaction between you and us, our aggregate liability to you for any claim relating to the Site is, to the maximum extent permitted by law, limited to the amount you paid us to use it — which is zero.

Some jurisdictions don't allow certain limitations on warranties or damages (in particular for personal injury caused by negligence, fraud, or any other liability that can't be excluded by law). In those jurisdictions, our liability is limited to the minimum extent permitted by law rather than excluded altogether. The next section describes how this works in specific regions.

— 12 · Your statutory rights

Consumer-rights carve-outs by region.

If you live in a jurisdiction with mandatory consumer-protection laws, those laws apply on top of these Terms and override anything in them that would conflict. Here's how that plays out in the main regions we serve:

— 13 · Indemnification

Indemnification.

To the maximum extent permitted by law, you agree to defend, indemnify, and hold harmless the Site operator, our contributors, and our service providers from and against any claims, damages, losses, costs, and expenses (including reasonable legal fees) arising out of or related to:

• Your violation of these Terms.
• Your violation of any law or third-party right.
• Your misuse of the Site, including submitting calculator output as stamped engineering drawings or using estimates for structural design without independent engineering review.
• Any claim that arises because of something you did to or with the Site that wasn't authorised under these Terms.

This obligation survives termination of these Terms. We'll notify you promptly of any claim that may trigger this clause and reasonably cooperate with your defence (at your expense). You may not settle any claim that imposes obligations on us without our prior written consent.

This section doesn't apply where prohibited by law, including in the consumer contexts described in section 12.

— 14 · Changes

Changes to the Site and to these Terms.

We update the Site continuously — adding calculators, refining existing ones, updating reference content as codes change, fixing bugs. Sometimes we'll remove a feature that hasn't worked well, or restructure a section. We can do this at our discretion, with or without notice. We try not to remove things that people are clearly relying on, but the Site evolves.

We also update these Terms from time to time. When we do, we revise the "Effective" and "Last reviewed" dates at the top of this page, bump the version number, and (for material changes) add a brief note to the changelog at the bottom of this page or to the page itself. Material changes that affect rights or obligations will, where applicable law requires, be brought to your attention before they take effect.

Continued use of the Site after a change to these Terms means you accept the updated version. If you don't agree to a change, your remedy is to stop using the Site. (We don't have a way to delete an "account" since there are no accounts.)

— 15 · Termination

Termination.

These Terms apply for as long as you use the Site. Both sides can end the relationship freely.

Your side — you can stop using the Site at any time. Close the tab, delete your bookmark, clear your browser's localStorage. There's nothing to cancel because there's no account.

Our side — we can suspend or block access from your IP address, network, or device if you materially breach these Terms (for example, by running automated abuse against the Site or attempting unauthorised access). For honest mistakes, we'd usually email or warn first; for active abuse, we may act immediately.

Provisions of these Terms that, by their nature, should survive termination will do so — including the intellectual property provisions, the warranty disclaimers, the limitation of liability, the indemnification, the governing law clause, and any obligation that arose before termination.

— 16 · Governing law

Governing law and dispute resolution.

These Terms are governed by the laws of the State of Delaware, United States, without regard to its conflict-of-law principles. Any dispute that can't be resolved by direct discussion will be subject to the exclusive jurisdiction of the state and federal courts located in Delaware, except as described below.

If you live in a region with mandatory consumer-protection law (the UK, EU/EEA, Australia, Canada, or any other jurisdiction where local law gives you a non-waivable right to bring claims in your home courts), nothing in this section prevents you from doing so. The Delaware choice-of-law and forum clause above applies only to the extent it's permitted by your local law.

Before bringing a formal dispute, please write to us at the contact address below. Most issues — a confusing calculator output, a typo in a table, a question about how we treat data — get resolved by email in a few hours and don't need anyone's lawyers involved.

The United Nations Convention on Contracts for the International Sale of Goods does not apply to these Terms.

— 17 · General provisions

General provisions.

Entire agreement

These Terms, together with our Privacy Policy and any other legal notices we publish on the Site, are the entire agreement between you and us about your use of the Site. They supersede any prior oral or written agreements on the same subject.

Severability

If any part of these Terms is held by a court to be unenforceable or invalid, the rest of these Terms continue in full effect. The unenforceable part will be replaced (where possible) by a valid provision that comes as close to the original intent as the law allows.

No waiver

If we don't enforce a right or provision in these Terms on a particular occasion, that doesn't mean we've waived our right to enforce it later or in another situation.

Assignment

You can't transfer your rights or obligations under these Terms to anyone else without our written consent. We can transfer ours (for example, if the Site is sold) to a successor that agrees to honour these Terms.

Force majeure

Neither side is liable for failures caused by events outside our reasonable control — internet outages, natural disasters, government actions, large-scale service-provider failures, that kind of thing.

Headings

The headings and section tags in these Terms are for convenience and don't affect interpretation.

Language

These Terms are written in English. If we ever publish a translation, the English version remains the controlling version for interpretation and dispute purposes.

— 18 · Contact

Contact.

For privacy-specific questions and rights requests, use the address in our Privacy Policy instead. For copyright takedown notices, you can use the legal address above and include the information required under section 8.