Calculator · Free

Paint Calculator

Calculate paint, primer and putty for a room, with the best mix of can sizes and an estimated cost.

Your result

Enter your numbers to see the result.

How this works

Wall area = 2 × (length + width) × height, minus 21 sq ft per door and 15 sq ft per window; the ceiling is length × width.
Coverage per litre per coat: economy 90, premium 110, luxury 120, exterior 80 sq ft. Primer covers about 110 sq ft/L; putty about 15 sq ft/kg for two coats.
Cans are combined from 20 L, 10 L, 4 L and 1 L packs with the least leftover.

Estimates are for planning only. Prices vary by city, brand and season — confirm with local suppliers and a qualified engineer.

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