Exterior Paint Calculator for Facades
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 preset for exterior walls: direct area input with coverage lowered to 8 m² per liter, because facade surfaces — render, roughcast, masonry, fiber cement — are more porous and textured than interior plaster and drink noticeably more paint. Measure each facade as width × height, add them up, and subtract windows and doors using the openings fields.
A worked example: 100 m² of facade at two coats and 8 m²/L needs 25 liters — two 10 L cans plus a 5 L can. Two coats is the norm outdoors: the first partly disappears into the substrate, the second builds the weatherproof film. On bare or patched render, add a primer coat first; primer is calculated separately and often halves the topcoat's absorption.
Real coverage outdoors swings widely — smooth painted render can reach 10 m²/L while coarse roughcast can drop to 4–6 m²/L, so check the range printed on your specific paint and adjust the coverage field. Buy in large cans from the same batch number where possible: facades are unforgiving of tint differences, and a 10–15% reserve saves a second trip and a visible patch. 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.