Paint calculator
Estimate how much paint you need for your walls.
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More practical tools for your next project.
Free tools for everyday decisions
Know what things really cost.
Plan DIY projects, work out garden materials, estimate energy bills and keep your household budget on track — with simple calculators built for the UK.
✓ Free to use✓ No account needed✓ Calculations run on your device✓ UK-friendly units
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Simple estimates, with the assumptions shown
RealCost UK helps you estimate quantities and costs before you start a project. Enter your measurements, prices or usage figures to get a result you can use for planning. Always check product packaging, supplier specifications and your actual tariff before buying materials or making a financial decision.
Remember: these tools provide estimates, not quotes. Allow for waste, uneven surfaces, product coverage differences and unexpected costs. Energy results depend on the unit rate and standing charge you enter.
Frequently asked questions
Are the calculators free?
Yes. The calculators are free to use and do not require an account or payment.
Do you store my measurements or budget?
The calculations run in your browser. This page does not send the numbers you enter to a RealCost UK server or store them in a database. If advertising or analytics is added, those third-party services may process technical information subject to the relevant privacy and consent requirements.
Why should I add extra materials for waste?
Cuts, breakages, awkward room shapes and future repairs can mean you need more material than the exact measured area. The recommended allowance varies by material and project, so adjust it to your situation and supplier guidance.
Are energy costs exact?
No. Enter the unit rate and standing charge from your own bill or tariff. Actual bills can also depend on meter conversion factors, discounts, taxes, time-of-use rates and changes in usage.
Can I rely on these results as a professional quote?
No. They are planning estimates only. Check measurements, supplier specifications, building requirements and costs with an appropriate professional when necessary.