About Us — Concrete Calculator Pro

— Why we built this

Why this site exists.

Every contractor, homeowner, and engineer who has ever ordered ready-mix has had the same frustrating experience: you need to know how many cubic yards (or cubic metres) to order, you Google "concrete calculator," and you land on a page that either makes you watch an ad first, asks for your email, hides the answer behind a sign-up, or — worst of all — gives you a number that's just wrong for your country and your code.

We started this site because we kept hitting that wall ourselves. The US calculators don't understand UK exposure classes. The UK calculators don't know about Australian site classifications. The Australian tools don't speak Canadian. And almost none of them tell you where the numbers come from, which makes it impossible to verify whether a default cover or rebar minimum reflects current code in your jurisdiction.

So we built one site that does four countries properly, cites the standard for every default, and stays out of your way. No accounts. No paywalls. No ads. No email capture. Open a calculator, type your numbers, get your answer. That's the entire user experience we set out to build.

One thing we promise.

If a number on this site is wrong — a typo in a table, an out-of-date code reference, a calculator producing a weird result — we'll fix it within two business days of being told. The "corrections" email goes straight to the engineers who review the page in question, not a generic inbox. Tell us about something broken and you'll see it change.

— What's on the site

What we cover.

Three types of content, all interlinked:

6 tools

Calculators

Slab, footing, column, block, yard (multi-shape), and cost. Each switches between US, UK, AU, and CA units and conventions with one click.

5,200+ words

Mix Guide

The long-form reference: PSI/MPa conversion, country naming conventions, exposure classes, water-cement ratio, slump, admixtures, and how to specify concrete to a supplier.

4 markets

Country pages

A dedicated home for each country covering the codes, mix grades, and conventions that apply locally — with cross-references to the calculators that use them.

We pair this with an Engineering References page that lists every code, standard, and authority body we cite — ACI 318, BS 8500, AS 3600, CSA A23.1:24, NBCC 2020, and the rest. If you want to verify a calculator default against the actual standard, that page is the lookup table.

— The reviewers

The four engineers who review the content.

Every calculator page, every reference table, and the entire Mix Guide is reviewed by a licensed engineer in the country it covers. Each reviewer signs off on their country's content before we publish, and they re-audit annually against the current edition of each cited standard. Their credentials are real, current, and listed below.

Jordan Mireles, P.E.

Civil Engineer · Texas P.E.

United States reviewer

Fourteen years across residential and light commercial concrete — slabs, footings, basements, parking pads, retaining walls. Most of Jordan's professional time has gone to the kind of work the calculators on this site cover: 1- to 3-storey residential structures, small commercial slabs, and the rebar and footing schedules to support them.

P.E. — Texas ASCE member ACI 318 / 332 / 306R IRC 2024

Olivia Bennett, CEng MICE

Chartered Civil Engineer · MICE

United Kingdom reviewer

Twelve years across UK residential and commercial concrete, including substantial time on clay-site foundations in the South-East and warehouse slabs in the Midlands. Olivia has a particular focus on translating BS 8500 designated mixes into orderable specifications and on the NHBC trench depth rules that drive most UK domestic footing decisions.

CEng — UK Engineering Council MICE — Institution of Civil Engineers BS 8500 / Eurocode 2 NHBC Standards

Liam Hartigan, CPEng RPEQ

Chartered Professional Engineer · RPEQ

Australia reviewer

Eleven years across NSW and QLD residential and coastal concrete. Liam has worked on enough sub-tropical houses within 1 km of surf to have strong opinions about B2 exposure class detailing, and on enough reactive-clay sites in western Sydney to take AS 2870 site classification very seriously. Speaks fluent Boral, Hanson, and Cement Australia.

CPEng — Engineers Australia RPEQ — Queensland register AS 3600 / AS 2870 / AS 1379 NCC Volume Two

Marc Tremblay, P.Eng

Professional Engineer · Ontario & Québec

Canada reviewer

Thirteen years across cold-climate concrete in Ontario and Quebec — basement walls, garage slabs, driveways exposed to road salt, the works. Marc takes air entrainment personally, having seen too many non-air-entrained slabs scale to gravel after one Ottawa winter. Licensed in two provinces because the work pattern follows the lake.

P.Eng — PEO Ontario Ing. — OIQ Québec CSA A23.1:24 / A23.3:19 NBCC 2020

An important boundary.

Our reviewers verify the content of this site against the standards they're licensed under. They are not your engineer-of-record. Emailing the site, reading a page reviewed by Jordan or Olivia or Liam or Marc, or using a calculator they signed off on does not create an engineer–client relationship between you and them. For a structural design that goes to a building department or insurance company, hire a licensed engineer in your jurisdiction directly.

— How we work

Four principles we hold ourselves to.

These aren't aspirational — they're how we decide what goes on the site and what doesn't.

01 / Honest scope

Estimates, not engineering.

The calculators tell you how much material to order. They are not a stamped structural design. We say this clearly on every relevant page, and we don't soften it for the sake of looking more authoritative than we are.

02 / Real sources

Every default has a citation.

If the slab calculator's default rebar cover is 75 mm, you can trace that back to CSA A23.1 in Canadian mode or ACI 318 §20.5.1 in US mode. The Engineering References page is the bibliography for the whole site.

03 / No dark patterns

You don't pay with your data.

No accounts, no email gates, no newsletter pop-ups, no remarketing pixels, no ads. The numbers you enter never leave your browser. The full data picture is in our Privacy Policy — it's a short read.

04 / Real corrections

Mistakes get fixed fast.

If we publish something wrong, the correction process goes through the engineer who reviewed that page — not a generic web form. Mention what's wrong and we'll have it corrected within 48 hours or tell you why we disagree.

— Honest about boundaries

What we aren't.

So you can decide quickly if we're useful to you:

We're not an engineering firm. We don't sign drawings, we don't issue letters of approval, we don't carry professional indemnity for client projects. For a real design, hire your own engineer.
We're not a contractor. We don't pour concrete. The calculators are reference tools for people who do, or for homeowners getting quotes.
We're not a ready-mix supplier. We don't sell concrete. The pricing in the cost calculator is current market data, not our quote.
We're not a building consultancy. We don't do paid consultations, project reviews, or design checks. The site is free and stays free.
We're not your warranty. Our liability for any use of the calculator output is capped at zero, because the service is free and provided "as is." The Terms of Service have the formal version of this.

What we are is a small reference site run by people who care about getting the numbers right and being honest about what the numbers mean. That's the entire pitch.

— Get started

Where to go from here.

Depending on what you're trying to do, one of these is probably the right next click:

We build the calculators we wished existed.