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Paint calculator

Gallons of finish paint and primer for walls and ceilings. Enter your dimensions: the result updates as you type.

Your dimensions

Units

Starting values: the exterior walls of a 28' x 40' bungalow (136 ft, 1 side) and the main floor ceiling (1,047.5 sq. ft).

ft
e.g. 136, 42'-6" or 12.5 m
ft
e.g. 8'-1 1/8", 9' or 2.44 m
Partition: 2 sides. Exterior wall: 1 side.
sq. ft
Length × width of each room, added up. 0 = walls only.
Primer is counted separately (1 coat).
sq. ft
Printed on the can, often 350 to 400 sq. ft per gallon.
%
Added to every quantity.

Results

Finish paint
—

Primer
—

Wall paint
—

Ceiling paint
—

Wall area to paint
—

How it's calculated

  • Wall area = length × height × painted sides.
  • Finish paint = area × coats ÷ coverage of one gallon, + waste, rounded up (walls and ceilings calculated separately).
  • Primer = area ÷ coverage of one gallon (1 coat), + waste, rounded up.

Measure once. The rest follows.

In KOR, this calculation happens on its own from your plans: the paint reuses the walls already measured for the framing, and the height follows the wall's.

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