Construction & Materials
Paint Calculator
Paint — paint Calculator divides the wall area by the coverage (square feet per gallon) and multiplies by the number of coats. This page runs that same calculation on your numbers, in your browser: no signup, no uploads, nothing stored.
Use Paint Calculator to estimate paint for a job: give it your wall area, coats and coverage, press Calculate, and read off the paint quantity to buy — all worked out on your device.
Estimate only — not a professional specification. Paint and wallpaper coverage varies with the surface, the number of coats or the pattern repeat and the product you choose, so confirm coverage rates and buy a little extra.
About this calculator
Get paint right and the rest of the task gets easier. Paint Calculator divides the wall area by the coverage (square feet per gallon) and multiplies by the number of coats. It matters before you buy: a clean volume estimate plus a waste allowance beats a guess every time. Walls totalling 60 m² at ~10 m² per litre per coat need 6 L per coat, so two coats = 12 litres . The tool above does the same computation in your browser — free, private, nothing stored.
How to use
- Enter the wall area in square feet.
- Enter the number of coats.
- Enter the coverage per gallon from the can.
- Tap Calculate to see the gallons needed.
Why use the Paint Calculator
Instant
Every quantity is worked out on your device the moment you tap Calculate.
Private
The numbers you enter stay in your browser and are never uploaded or saved.
Free
No signup, no paywall, and no ads placed inside your results.
Works offline
Once the page has loaded it keeps working on a weak or dropped connection.
Mobile-first
Laid out for phones and tablets on site just as much as for desktops.
Planning estimates
Results are simplified planning estimates; real material needs vary by product size, waste, layout, local codes, and site conditions, so confirm before you buy or build.
Common uses
Use it for wall area and the number of coats
Use it for an interior or exterior job
Use it for a room repaint or feature wall
Use it when reducing wasted paint
Use it for decorator and client quotes
Use it when sizing an order to wall area
Technical notes
Paint Calculator divides the wall area by the coverage (square feet per gallon) and multiplies by the number of coats.
Coverage depends on the surface, colour and number of coats; buy a little extra for touch-ups.
Nothing you type is uploaded — the calculation happens entirely on your device.
Worked example
Walls totalling 60 m² at ~10 m² per litre per coat need 6 L per coat, so two coats = 12 litres.
FAQ
Can I change the coverage per gallon?
Yes. Enter the coverage printed on your paint can so the estimate matches that product.
Does the Paint Calculator upload my area?
No. The Paint Calculator runs in your browser and your figures are never sent to a server.
How are coats handled?
The area is multiplied by the number of coats before dividing by the coverage per gallon.
Why is the coverage required?
Spread rate varies by paint and surface, so coverage drives the gallons and must be greater than zero.