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Concrete Calculator UK
How much concrete to order, in m³, bags or site mix
Working out the volume is the easy part. This goes on to what you actually order in the UK: ready-mix rounded up to the next quarter m³, with a warning when you are under the usual 3 to 4m³ minimum load; 25kg or 20kg bags; or cement, ballast and water to mix on site, with mixer loads. It names the BS 8500 mix to ask for, prices the job at 2026 rates and shows the working. Slabs, footings, post holes and steps, in metric or feet and inches. Free, no signup.
Hi Product Hunt,
We build websites for UK tradespeople, and alongside that we publish free tools for the sums they do every week. This is the concrete calculator.
Getting the cubic metres is the easy part. The questions after it are harder: how much do I actually order, is ready-mix worth it for a job this size, and which mix do I ask for? So the calculator answers those too:
• ready-mix rounded up to the next quarter of a cubic metre, with a warning when you are under the usual 3 to 4m³ minimum load and will pay a part-load charge
• the number of 25kg or 20kg bags if you are buying from the merchant
• cement, ballast and water if you are mixing on site, with the number of mixer loads
• the BS 8500 mix name to give the supplier, such as GEN3 for a shed base or PAV1 for a drive
• a cost estimate at 2026 UK prices, excluding VAT
We were careful with the site mix figures. Suppliers and other calculators disagree by 10 to 20%, so every mix is checked so the cement, sand and gravel add up to what a cubic metre of placed concrete weighs, about 2.3 to 2.5 tonnes.
It works in metric or feet and inches, shows its working, and there is no signup.
If you pour concrete for a living, tell us what it gets wrong or leaves out.
About Concrete Calculator UK on Product Hunt
“How much concrete to order, in m³, bags or site mix”
Concrete Calculator UK was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #155 on the daily leaderboard. Working out the volume is the easy part. This goes on to what you actually order in the UK: ready-mix rounded up to the next quarter m³, with a warning when you are under the usual 3 to 4m³ minimum load; 25kg or 20kg bags; or cement, ballast and water to mix on site, with mixer loads. It names the BS 8500 mix to ask for, prices the job at 2026 rates and shows the working. Slabs, footings, post holes and steps, in metric or feet and inches. Free, no signup.
On the analytics side, Concrete Calculator UK competes within Construction, Home improvement and DIY — topics that collectively have 4k followers on Product Hunt. The dashboard above tracks how Concrete Calculator UK performed against the three products that launched closest to it on the same day.
Who hunted Concrete Calculator UK?
Concrete Calculator UK was hunted by Janusz Wozniak. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Concrete Calculator UK including community comment highlights and product details, visit the product overview.
Janusz Wozniak