Primer Calculator
How many gallons of primer you need
Priming before you paint? Enter your wall dimensions to find how many gallons of primer to buy.
How much primer?
Primer covers a bit less than paint — about 250–300 ft² per gallon — because it soaks into porous surfaces. One coat of primer is usually enough over clean drywall or for color changes.
Frequently asked questions
Do I need primer before painting?
Yes for new drywall, bare wood, stains, or big color changes. Over a sound, similar-color wall you can often skip it.
How much does primer cover?
About 250–300 square feet per gallon, less than finish paint.