Paint Calculator for One Room
Work out how many liters of paint a room, wall, ceiling or facade needs: wall area from dimensions or direct input, minus doors and windows, times coats — with can sizes to buy.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
This page opens the paint calculator in room mode: enter the room's length, width and ceiling height, and it computes the wall area as perimeter × height — the same measurement you would take with a tape measure, done for you. Doors and windows are then subtracted at standard sizes (1.9 m² per door, 1.4 m² per window), because nobody paints over the glass.
A worked example: a 4 × 5 m room with 2.7 m ceilings has 2 × (4 + 5) × 2.7 = 48.6 m² of wall. Take off one door and two windows and 43.9 m² remain; at two coats and a typical coverage of 11 m² per liter that is about 8 liters of paint — say a 5 L can plus three 1 L cans, or one 10 L can with a comfortable reserve.
Two practical notes: this preset covers the walls only — calculate the ceiling separately (there is a dedicated ceiling page for that), and buy roughly 10% extra for touch-ups and future repairs, since color batches vary between production runs. Strong color changes or fresh plaster may need a third coat, which you can set directly in the coats field. Everything is calculated locally in your browser.
Example. A 12 square meter wall, no doors or windows, one coat, and coverage of 11 square meters per liter returns 1.1 liters.
Limit. Each door is subtracted as 1.9 square meters and each window as 1.4 square meters, and can sizes are only 10, 5, 2.5, and 1 liter.