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build.paint-area Calculator
Calculates paintable area from wall and ceiling dimensions less doors and windows, and converts to litres needed at the product's stated coverage rate. Standard interior paint covers 10–12 m²/litre — porous surfaces or dark colour changes require two coats.
Inputs
L
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
W
Horizontal extent perpendicular to the length.
H
Vertical measurement. For health calculators, typically standing height without shoes.
Cov
Age in completed years. Many health and fitness formulas adjust for age.