Paint Calculator
Litres or gallons of paint needed, allowing for doors and windows.
m
m
m²/L
Paint needed
8.07L
for 2 coats
Wall area
44.4m²
Area to cover
88.8m²
Buy (2.5 L tins)
4 tins
ShowHide the working
- 1Wall area = 20 × 2.4 − 2 openings × 1.8 = 44.4 m²
- 2Over 2 coats = 88.8 m²
- 3÷ 11 m²/L = 8.07 L
Formula
litres = wall area × coats ÷ coverageHow it works
Estimates paint from wall area, coats and coverage, subtracting an average allowance for each door and window.
Example
48 m² of wall over 2 coats at 11 m²/L needs about 8.4 L.
Coverage varies by paint and surface. Buy about 10% extra for touch-ups.
About the Paint Calculator
Litres or gallons of paint needed, allowing for doors and windows. It sits in the Home & Construction section of NWS Calc, a free collection of calculators that run entirely in your browser. There is no signup, no paywall and no tracking — open the page, enter your numbers, get an answer.
Frequently asked questions
- Is the Paint Calculator free to use?
- Yes. Every calculator on NWS Calc is completely free, with no signup, no usage limits and no ads.
- Does my data leave my device?
- No. The Paint Calculator runs entirely in your browser using JavaScript. Nothing you type is uploaded, logged or stored on a server.
- Can I use the Paint Calculator on my phone?
- Yes. The page is fully responsive and works in any modern mobile or desktop browser — there is nothing to install.
- What else is in Home & Construction?
- Paint, tile, concrete, flooring, lumber and material estimates. You can browse the full Home & Construction category for related calculators.