About this calculator

Most emulsion covers ~10 m²/L per coat. Doors and windows reduce paintable area but most decorators ignore that for safety and use 2 coats.

Frequently asked questions

What does the Paint Coverage Calculator do?

Work out how many litres or gallons of paint you need for a room or wall. Most emulsion covers ~10 m²/L per coat. Doors and windows reduce paintable area but most decorators ignore that for safety and use 2 coats.

Is the Paint Coverage Calculator free to use?

Yes. Every calculator on Calcora is free, works in your browser without sign-up, and can be embedded on your own website.

How accurate is the Paint Coverage Calculator?

Results are calculated in real time using industry-standard formulas. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified painting & decorating professional before committing to a purchase or a job.

What inputs does the Paint Coverage Calculator need?

Enter values for: Wall length (m), Wall height (m), Coats, Coverage (m²/L). Sensible defaults are pre-filled where possible so you can start with a single change.

Can I embed the Paint Coverage Calculator on my own website?

Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcora.