Know what it'll cost
before you start the build.
BuildCalcuk is a growing library of free, no-signup calculators for UK homeowners, self-builders and tradespeople — working out cost, quantities, weight and volume to UK measurements and UK suppliers' conventions.
Every job on a self-build or renovation starts as a shape with dimensions — that's exactly what each BuildCalcuk tool turns into a materials list.
Most UK building and renovation projects start with the same question: what will this actually cost, and how much material do I need to buy? BuildCalcuk answers both, one job at a time. Rather than a single do-everything calculator, each tool on this site is built around one specific task — a concrete pour, a build cost estimate, a room's worth of materials — so the inputs and the units match how UK merchants, builders and ready-mix suppliers actually quote. There's no account to create and no email to hand over: enter your dimensions, get a working estimate you can take to a supplier, and treat it as a starting point for a quote rather than a final invoice.
Calculators, organised by the job you're doing
Start with the tool for the job in front of you. New categories are added as they're built and tested — this page always reflects what's actually live.
Materials & quantities
Work out how much of a material a job needs — volume, weight and bag or bulk-order quantities.
Open Concrete Calculator →Concrete cost estimate
Turn your concrete volume into a total price — enter your own £ per m³, delivery fee and pump surcharge.
Open cost estimate →Ready-mix truck estimate
See how many ready-mix truck loads your pour needs, and how full the last load will be.
Open truck estimate →Costs & budgeting
A dedicated build, extension or renovation cost calculator — per square metre or per project, with delivery and labour factored in.
Structural & sizing
Joists, stud spacing, stair rise-and-go and other numbers that need to match Building Regs.
Land & groundworks
Area, gradient and excavation figures for gardens, driveways and site prep.
Built for UK jobs
Bag sizes, densities and units match what UK merchants and suppliers actually quote in.
No account, ever
Every calculator runs in the page — nothing to sign up for or hand over.
Shows its working
Each tool states the formula and assumptions it uses, not just a final number.
Estimates, stated plainly
Results are a planning starting point — always confirm final quantities with your supplier.
About BuildCalcuk
What is BuildCalcuk?
BuildCalcuk is a free library of building and renovation calculators for the UK market. Instead of one general-purpose tool, each calculator is built for a specific job — the first being the Concrete Calculator — so the numbers match how that job is actually measured and bought.
Is BuildCalcuk free to use?
Yes. Every calculator on the site is free, with no account or sign-up required, and that isn't going to change as more tools are added.
Which calculators are available right now?
The Concrete Calculator is live today, covering slabs, footings, holes, columns, curbs and stairs. Costs, structural and land/groundworks calculators are in progress — this homepage is kept up to date as each one launches.
Is there a free construction calculator on this site?
Yes — the Concrete Calculator is live now and free to use with no sign-up. More free UK construction calculators, covering costs, structural sizing and groundworks, are in progress.
Are the results accurate enough to order materials with?
Each calculator is built around the standard formula and assumptions for that job, shown on the page alongside the result. They're a solid planning estimate — but site conditions vary, so always confirm final quantities with your supplier before ordering.
Can I suggest a calculator you don't have yet?
Yes — get in touch through the Contact page with the job you're planning and what a useful calculator for it would look like.