Paint Calculator
Work out how much paint you need for a room in litres or gallons. Enter wall length, height, number of coats and the coverage on the tin.
Enter your values and press Calculate.
How to use the Paint calculator
Measure every wall you plan to paint and add the lengths together, then enter the wall height. The result covers the full wall area, so you will have a little paint to spare around doors and windows. Two coats are recommended for colour changes and new plaster or drywall.
Formula
Wall area = total wall length × height; paint = area × coats ÷ coverage.
Frequently asked questions
How much paint do I need for a room?
A 4 m × 3 m room with 2.4 m walls has about 34 m² of wall. Two coats at 12 m² per litre need about 5.6 litres.
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