Calculate how much paint you need for walls, ceilings and trim based on room dimensions.
A 12×12 ft room with 8 ft ceilings has about 384 sq ft of wall area. After deducting doors/windows, you'll need roughly 2 gallons for 2 coats.
Most projects need 2 coats for even coverage. Going from a dark to light colour may require 3 coats or a tinted primer first.
No – this calculates wall paint only. For ceilings, multiply length × width and divide by the coverage rate.
Use primer on bare plaster, new wood or metal, or when making a big colour change. On fresh plaster, a watered-down mist coat seals the surface before your top coats go on.
Around 10–12 m² per litre per coat on smooth walls; rough or absorbent surfaces cover less. The calculator uses a realistic spread rate.
Calculate the number of wallpaper rolls needed for any room, accounting for pattern repeat.
OpenEstimate how much plaster you need for walls and ceilings, the number of bags and the total cost in metric or imperial units.
OpenCalculate how many litres of decking or fence stain you need based on the area and number of coats.
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