Find the coverage rate — gallons applied per square foot — for paint, sealant, or any liquid spread over a surface.
How it works
Coverage rate is gallons used divided by the area covered: coverage = Gallons ÷ Area. 50 gallons over 200 square feet works out to a coverage rate of 0.25 gallons per square foot.
What this does not include
This calculates an actual coverage rate from real usage — it doesn’t predict how many gallons a specific product’s label claims will cover, which varies by product and surface porosity.
How to use this calculator
- Enter the gallons used.
- Enter the area covered.
Why does actual coverage often differ from the can’s stated coverage?
Porous or rough surfaces absorb more material than the smooth test surfaces manufacturers often use to establish label coverage rates.
How can I use this to plan a future project?
Calculate the coverage rate from a small test area, then divide your total project area by that rate to estimate how much material to buy.
Does this account for multiple coats?
No — enter the gallons and area for a single coat; multiply the result by the number of coats planned if applying more than one.
