Paint calculator
- how much paint should i buy
- how much paint should i buy for a bedroom
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- how much does 1 litre of paint cover
1 gallon of paint coverage.
Paint Calculator
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- Calculating how much paint you need
- Paint calculation example
Calculating how much paint you need
In order to calculate how many gallons or litres of paint you need to paint a room, house, or an exterior surface, you need to either know the measurements by plan, or have a long measurement tape ready (10 or 20 meter / 33 or 65 foot long is advised) before you can use this paint calculator.
If you are painting an interior surface, you need to know the room's width, length and height.
How much paint is needed for a 12x12 room?
Rooms with non-rectangular layout can be approximated to rectangles. If you need to paint a ceiling or external wall, switch to "External" in the calculator and just enter the total width and height of the wall (or width and length instead, for a ceiling).
Usually the room or exterior will have openings for windows and doors which need to be excluded from the total surface area.
Accurate measurement of the windows is important, especially if there are many of them. Our tool only supports one set of window dimensions,
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