Paint Calculator
Calculate paint needed for walls, rooms, and projects. Estimate paint coverage, gallons needed, and cost for interior and exterior painting.
Paint Calculator
Paint Results
Enter dimensions to calculate paint needed
About the Paint Calculator
Our free paint calculator estimates litres or gallons of paint needed for walls and rooms. Enter dimensions and number of coats; get volume and coverage. Coverage depends on surface and paint type—use the calculator as a guide and buy slightly more for touch-ups. For area only use our area calculator.
You may also find our area calculator useful.
Frequently Asked Questions
How much paint do I need for a room?
Multiply total wall area (length × height × number of walls, minus windows/doors) by number of coats, then divide by coverage per litre. This calculator does it when you enter room dimensions.
What is typical paint coverage?
Often 10–12 m² per litre per coat for interior walls. Coverage varies by product and surface; check the tin.
How many coats should I plan for?
Two coats are standard for most walls. Dark colours or big colour changes may need more; the calculator lets you set coat count.