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Paint Calculator

Calculate the amount of paint needed for a room based on size and coats.

Unit system:

Room length (m)

Room width (m)

Ceiling height (m)

Number of doors

Number of windows

Average door area (m²)

Average window area (m²)

Number of coats

Coverage (m² per liter)

Can size (liters)

About this calculator

This tool estimates the amount of paint needed for a rectangular room by calculating wall area, subtracting doors and windows, and multiplying by the number of coats. Coverage defaults are typical values (≈10 m²/L or ≈350 ft²/gal) and can vary by paint and surface. Average door/window areas are approximations and can be adjusted. Always consider surface condition and add a small safety margin if needed.