Paint calculator
Enter your wall dimensions, subtract windows and doors, set the number of coats — and get liters or gallons plus how many cans to buy.
Units
Typical: 350–400 sq ft per gallon (10–12 m² per liter) per coat
📐 You need
Estimates are for planning. Always confirm quantities with your supplier before ordering.
Frequently asked questions
How much paint do I need per square foot?
Most interior paints cover 350–400 square feet per gallon per coat (10–12 m² per liter). Porous or textured surfaces and strong color changes reduce coverage, so use the lower figure when in doubt.
How many coats of paint do I need?
Two coats is the standard for a uniform finish. One coat only works when repainting with the same or very similar color; covering a dark color may take three.
Do I subtract windows and doors from the wall area?
Yes. Add up the area of all openings and enter it in the openings field — a standard door is about 20 sq ft (1.6 m²) and an average window 15 sq ft (1.4 m²).
Should I buy exactly the calculated amount?
Round up to whole cans and keep the remainder for touch-ups. Paint from a later batch can differ slightly in shade, so buying everything at once is safer.
About this calculation
This calculator uses the dimensions, waste allowance and material sizes entered above. MaterialCalc is developed by Igors Beļavskis, a construction contractor in Latvia. Results are planning estimates; confirm product coverage, local rules and site conditions before ordering.
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