How much paint do I need?

Enter your room size and get the exact number of gallons or litres — instantly. Free paint calculator for walls, ceilings and exteriors, in feet or metres.

🖌️ Paint calculator

UnitsSurface

Length (ft)Width (ft)

Wall height (ft)Coats

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🛏️ Rooms

How much paint for common room sizes — wall paint by the square foot, plus bedrooms, kitchens and more.

⬜ Ceilings

Paint needed to cover ceilings of every common size.

What it costs to paint a room — DIY paint cost vs hiring a pro.

🏠 Exterior

Paint and stain estimates for house exteriors, fences, decks, garages and siding.

📘 Guides

Cabinets, doors, trim, coats and the math behind paint estimates.

📐 Metric (m)

Paint amounts in litres for room and ceiling sizes measured in metres.