Polyurethane Calculator
How much poly to buy for your project
Total Coverage Needed
300ft²
Gallons Needed
0.5gal
Pints Needed
4.0pt
How to use this polyurethane calculator
Enter your surface area and how many coats you’re planning — three is typical for a durable finish on furniture or flooring. Pick your application method, since spray finishes lose more material to overspray than a foam applicator or brush lays down directly.
Formula
Total Coverage = Area × Coats
Gallons Needed = Total Coverage ÷ Coverage Rate
Gallons Needed = Total Coverage ÷ Coverage Rate
Poly is often sold in pints and quarts for smaller projects rather than full gallons — this tool shows both so you’re not stuck buying a full gallon for a project that only needed a pint.