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tool.paint-calculator Calculator
Calculates litres of paint required for a room accounting for multiple coats, door and window deductions, and a 10% waste factor. A second coat requires 80% of the first coat volume — most paint calculators ignore this and the job runs short.
Inputs
Width M
Horizontal extent perpendicular to the length.
Length M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Height M
Vertical measurement. For health calculators, typically standing height without shoes.
Coverage
Age in completed years. Many health and fitness formulas adjust for age.