// multi-utility computation suite · offline · instant · precise
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home.room-paint-coverage Calculator
Calculates litres of paint required for walls, ceiling, and trim from room dimensions, door and window deductions, and the paint's stated coverage rate. Paint coverage varies significantly by surface porosity — this accounts for typical 10% waste on first coat.
Inputs
Length M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Width M
Horizontal extent perpendicular to the length.
Height M
Vertical measurement. For health calculators, typically standing height without shoes.
Num Doors
Count of items or occurrences.
Num Windows
Count of items or occurrences.
Results
paint required (litres, 2 coats)
The value at the specified point or condition.
paintable wall area (m²)
The computed two-dimensional surface area.
gross wall area (m²)
The computed two-dimensional surface area.
coverage assumption
The fraction of the total that is protected, tested, or accounted for. Higher coverage reduces risk of gaps.
include ceiling
Sample size or count used in the calculation.
primer
Reference formula or conversion factor shown for context.