The Floor Paint for Room calculator computes the number of gallons of floor paint needed for a floor area of a rectangular room, deck, slab or portch based on the length and width of the room and the coverage per gallon.
INSTRUCTIONS: Choose units and enter the following:
- (L) Length of Room
- (W) Width of Room
- (PC) Paint Coverage (Default: 400 ft2 for many floor paints)
Floor Paint (nG): The calculator returns the total area in square feet and square meters. However, this can be automatically converted compatible units via the pull-down menu.
The Math / Science
The formula for the area of a rectangular room and number of gallons of floor paint is:
A = L ⋅ W
nG = ceil(A/PC)
where:
- nG = Number of Gallons of Floor Paint
- A = Floor Area of Room
- L = Length of Room
- W = Width of Room
- PC = Paint Coverage per Gallon
Floor Paint Calculators
- Floor Paint for Area: Floor paint, stain, sealer or coating for an area based on the size of the area and coverage per gallon of paint (etc).
- Floor Paint for Room: Floor paint for a Rectangular Room based on the dimensions and coverage per gallon.
- Floor Paint for Room with Angled Bump-out: Floor paint for Rectangular Room with one or more Angled Bump-out based on dimensions and coverage per gallon.
- Floor Paint for Room with Squared Bump-out: Floor paint for Rectangular Room with one or more Squared Bump-out based on dimensions and coverage per gallon.
Most rooms are simple rectangles with a length and a width. The only common departure are rooms with bump-outs. Some bump-outs are angular and taper down from an opening. Some bump-outs have squared corners. To compute the square feet of these floors are simple geometry based on the measurements of the main floor and the bump-out dimensions.
To compute the area of a floor with a different shape (e.g., circular, oval, or polygon), see the Area Calculator.