Gallons per Square Foot Calculator

Your details

Coverage rate mode fits most paints and sealers. Mils mode is used for epoxies and industrial coatings where thickness is specified. Depth mode suits irrigation, concrete curing, or waterproofing membranes.
Total area you need to coat or water, in square feet.
sq ft
Check the label on your paint or sealer. Interior latex typically covers 350-400 sq ft per gallon; exterior paint 250-350; stucco and brick 150-200.
sq ft / gal
Most paints require 2 coats for full coverage. Primers and sealers often need only 1. Technical coatings may specify 3 or more.
Extra material to allow for overspray, spills, uneven surfaces, and touch-ups. A 10% buffer is typical for roller application; spray application may need 15-20%.
%
Optional. Enter the price per gallon from your paint can or store receipt to get a total material cost estimate.
USD
Total gallons needed
3.14

Including all coats and waste factor

Gallons per sq ft0.0063
Sq ft per gallon159.1
Total gallons3.14
Sq ft per gallon159.1

You need 3.14 gallons for this project.

  • You need about 3.14 gallons - buy 4 full gallons to cover 500 sq ft with 2 coats.
  • Your effective coverage is 159 sq ft per gallon after accounting for the 10% waste factor.

Next stepRound up to the nearest gallon when purchasing. Leftover paint in a sealed can lasts 2-5 years and is useful for touch-ups.

 = Powered by OnlyCalculators