Paint calculator
How many gallons of paint a room takes. Enter the room, the wall height, the coats and the coverage printed on the can.
The editor opens with this room, inside sizes and wall height, ready to draw the rest of the home.
Our own starting value. Use the number on your can.
- Area first, then gallons
- Check the label on the can
Add up the walls (the distance around the room times the height), take off doors and windows, multiply by the coats and divide by the coverage on the can. The calculator starts at 350 sq ft per gallon, our own starting value. Updated · How we calculate
How we calculate
How we calculate
The wall area comes from our calculation core: the distance around the room times the wall height. Doors and windows you enter are taken off; the ceiling is added when you tick it.
Coverage differs per paint and per wall. We found no public, neutral source for one number, so the calculator starts at 350 sq ft per gallon, our own starting value. Use the number printed on your can.
| What | Figure |
|---|---|
| Coverage per gallon | 350 sq ft, our own starting value; use your can · No public source yet |
No public, neutral source found yet; the starting values in the calculator are our own and you can change them.
From one room to the whole home
From one room to the whole home
This calculator works one room at a time. In the editor you draw your whole home: each room shows its floor area inside the walls and its perimeter, and each wall side gets its own color.
Before you buy
Before you buy
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Check the can
Coverage is printed on the can and differs per paint and finish.
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Rough walls take more
New drywall and rough surfaces take more paint than primed, smooth walls.
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Mix the cans
If you buy several cans of one color, mix them in a bucket so the color stays even.
Other materials
Other materials
- Work it out →
Drywall calculator
How many drywall sheets a room takes.
- Work it out →
Wallpaper calculator
How many rolls of wallpaper a room takes.
- Work it out →
Flooring calculator
How much flooring to buy for a room, with extra for cuts and waste.
- Open the calculator →
Room square feet
The area of every room, and the total for the home.
How many square feet does a gallon of paint cover?
It is printed on the can and differs per paint and per wall. We found no public, neutral source for one number; the calculator starts at 350 sq ft per gallon, our own starting value.
How much paint do I need for a room?
Add up the walls (the distance around the room times the height), take off doors and windows, multiply by the number of coats and divide by the coverage on the can.
How do I add the ceiling?
Tick the ceiling box: the calculator adds the floor area of the room as the ceiling.
How do I measure walls for paint?
Measure the length and width of the room at floor level and the height from floor to ceiling. Measure doors and windows and add their areas up.
Start with your first floor plan
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