Estimate the paint needed for your room using feet-based measurements, the number of coats and optional price per litre.
Enter the room length, width and wall height in feet. The calculator estimates paint for four walls. You can optionally subtract doors and windows by entering their count and dimensions.
Paint calculator
How to use the paint calculator
- Enter room length, room width and wall height in feet.
- To subtract openings, turn on the doors and windows option, then enter their count, length and width in feet.
- Enter the number of coats. Add price per litre and select your currency if you want a cost estimate.
- Press “Calculate paint.” The estimate uses typical coverage of 10 m² per litre and includes 10% extra paint.
This quick estimate is designed to be easy to use. For multiple openings of different sizes, enter an average length and width for each type. Actual paint use can also vary with the surface and paint label. The ceiling is not included.
Frequently asked questions
What measurements do I enter?
Enter the room length, room width and wall height in feet. The tool estimates paint for the four walls.
How many coats does this estimate use?
Enter the number of coats you plan to apply. Coverage depends on the paint, surface and colour, so check the paint container.
How are doors and windows deducted?
Turn on the option and enter the count, length and width in feet. The calculator subtracts length × width × count for windows and doors separately.
Can I estimate paint cost in my currency?
Yes. Enter the price per litre and select a currency. The currency list uses the browser’s international currency data; select Other to enter a valid three-letter currency code.
Does it include the ceiling?
No. This calculator estimates the four walls only.
