Paint calculator: gallons by coats

Put in the area, the coats and the coverage on your can. Get the gallons.

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Walls

Wall area

sq ft

or Perimeter, Wall height and Openings deducted

Perimeter

Wall height

Openings deducted

sq ft

Coats

Coverage

sq ft per gallon

Use the coverage printed on the product you're buying.

Check the label. Coverage changes with the surface and the paint.

Ceilings

Ceiling area

sq ft

Same as walls

Exterior

Exterior area

sq ft

Same as walls

Primer

Primer coats

Primer coverage

sq ft per gallon

	Gallons	Whole gallons
Walls	–	–
Ceilings	–	–
Exterior	–	–
Gallons, finish	–	–
Gallons, primer	–	–

An estimate from the numbers you enter. Check your own figures.

The formula usedGallons = area × coats ÷ coverage, for each area. Primer gallons = area × primer coats ÷ primer coverage. Whole gallons = each figure rounded up.

Nothing you type here is saved. Download it if you want to keep it.

How it works out

Gallons are the area times the coats, divided by the coverage on your can. Primer is figured the same way, on its own coverage. The tool rounds up to whole gallons beside the exact figure.

Do it on the real job

Painting comes with the painting takeoff: wall area, ceiling area, exterior area, coats, trim, doors and windows.

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Questions

Does primer count as a coat?

No. Coats are the finish coats. Put primer in its own row with its own coverage.

Where do I get the coverage?

From the can or the product's data sheet. Type the number for the product you're using.

How do I get the wall area?

Multiply the room's perimeter by the wall height, then take off the doors and windows. Or type the wall area if you have it.