Paint Calculator
Fill in the values and the answer updates as you type.
How the Paint Calculator works
Wall area = 2 × (length + width) × height, minus 1.8 m² per door or window. Paint covers about 10 m² per liter per coat.
Inputs and results
The Paint Calculator takes 5 inputs and gives 3 results.
What you enter
- Room length (m) — starts at 5.
- Room width (m) — starts at 4.
- Wall height (m) — starts at 2.5.
- Doors and windows — starts at 2.
- Coats — starts at 2.
What you get
- Paint needed (liters)
- Wall area (m2)
- Cans of 5 L
Example: Paint Calculator with the starting values
With room length 5 m, room width 4 m, wall height 2.5 m, doors and windows 2 and coats 2, the calculator returns:
| Paint needed (liters) | 8.3 |
|---|---|
| Wall area (m2) | 41.4 |
| Cans of 5 L | 2 |
Change any value above and the results update straight away.
Paint Calculator FAQ
How do I use the Paint Calculator?
Enter room length, room width, wall height and doors and windows in the fields, then read paint needed (liters), wall area (m2) and cans of 5 l in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Paint Calculator calculate?
Paint needed to cover the walls of a room. It returns paint needed (liters), wall area (m2) and cans of 5 l from the 5 values you provide.
What values does the Paint Calculator start with?
It opens with room length 5 m, room width 4 m, wall height 2.5 m and doors and windows 2 so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Paint Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Paint Calculator for important decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm important decisions with a qualified professional. See the Disclaimer for more.