// multi-utility computation suite · offline · instant · precise
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tool.room-paint-coverage Calculator
Calculates gallons of paint for a room at a specified coverage rate, including ceiling and trim, with deductions for doors and windows. Trim and ceiling often require a different product than walls — this separates the quantities by surface.
Inputs
Room Length Ft
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Room Width Ft
Horizontal extent perpendicular to the length.
Ceiling Height Ft
Vertical measurement. For health calculators, typically standing height without shoes.
Doors And Windows
Reference formula or conversion factor shown for context.
Results
gallons for walls (1 coat)
The value at the specified point or condition.
gallons for ceiling (1 coat)
The value at the specified point or condition.
total (2 coat walls + 1 ceil)
The combined total across all inputs and components.
wall area (sq ft)
The computed two-dimensional surface area.
ceiling area (sq ft)
The computed two-dimensional surface area.
tip
Gratuity amount — the suggested amount to add to the bill as a service tip.