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Paint Calculator

The paint for a room's walls (and ceiling), less doors and windows, for the coats you will apply.

Construction & GeometryTop 100 · #74Runs in your browser

Result…

Units
m
m
m
m²

A standard door is about 1.9 m² (21 ft²).

m²
Ceiling too
m² per litre

On the tin; typically 10–12 m²/L (350–400 ft²/gal) on smooth walls.

 

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How it's calculated

Walls = 2 × (length + width) × height
Area = walls − doors − windows (+ ceiling)
Paint = area × coats ÷ coverage

Estimates the paint for a rectangular room from its size, the doors and windows you will not paint, and the coats you plan. Coverage is on the tin and varies by product and surface; round up to whole tins. Trim, doors and ceilings are often a different paint, so work them out separately.

Your numbers, step by step

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