Epoxy Calculator
Estimate epoxy resin or floor coating in gallons and kits from area, coats and manufacturer coverage.
Loading calculator…
Currency: Amounts are calculated in the currency you select; this site does not convert between currencies and does not use live exchange rates.
What this tool does
Estimate epoxy resin or floor coating in gallons and kits from area, coats and manufacturer coverage. Coverage defaults to 250 sq ft per gallon per coat, a typical manufacturer figure for a ~10 mil coat on sealed concrete; porous or rough surfaces drink more. Two-part epoxy must be used within its pot life once mixed.
How to use the Epoxy Calculator
- Enter or select floor / surface area in sqft.
- Enter or select number of coats.
- Enter or select coverage per gallon per coat (sq ft) in sqft.
- Enter or select kit size (gallons).
- Enter or select price per kit.
- Read the calculated result; change any measurement to compare alternatives.
Formula
gallons = area × coats / coverage per gallon; kits = ceil(gallons / kit size)
- area
- Floor / surface area (sqft, before metric conversion)
- coats
- Number of coats
- coverage
- Coverage per gallon per coat (sq ft) (sqft, before metric conversion)
- kit
- Kit size (gallons)
- kitPrice
- Price per kit
Coverage defaults to 250 sq ft per gallon per coat, a typical manufacturer figure for a ~10 mil coat on sealed concrete; porous or rough surfaces drink more. Two-part epoxy must be used within its pot life once mixed.
Worked example
For epoxy calculator, the following measurements illustrate the exact method: Floor / surface area: 400; Number of coats: 2; Coverage per gallon per coat (sq ft): 250; Kit size (gallons): 1.5; Price per kit: 120.
Inputs
- Floor / surface area400 sq ft
- Number of coats2
- Coverage per gallon per coat (sq ft)250 sq ft
- Kit size (gallons)1.5
- Price per kit120
Result
- Epoxy needed3.2 gal
- Kits to buy3
- Epoxy purchased4.5 gal
- Estimated kit cost$360.00
Results explained
- Epoxy needed
- Epoxy needed from the formula above, expressed in gal before metric conversion. Coverage defaults to 250 sq ft per gallon per coat, a typical manufacturer figure for a ~10 mil coat on sealed concrete; porous or rough surfaces drink more. Two-part epoxy must be used within its pot life once mixed.
- Kits to buy
- Kits to buy from the formula above. Coverage defaults to 250 sq ft per gallon per coat, a typical manufacturer figure for a ~10 mil coat on sealed concrete; porous or rough surfaces drink more. Two-part epoxy must be used within its pot life once mixed.
- Epoxy purchased
- Epoxy purchased from the formula above, expressed in gal before metric conversion. Coverage defaults to 250 sq ft per gallon per coat, a typical manufacturer figure for a ~10 mil coat on sealed concrete; porous or rough surfaces drink more. Two-part epoxy must be used within its pot life once mixed.
- Estimated kit cost
- Estimated kit cost from the formula above. Coverage defaults to 250 sq ft per gallon per coat, a typical manufacturer figure for a ~10 mil coat on sealed concrete; porous or rough surfaces drink more. Two-part epoxy must be used within its pot life once mixed.
Frequently asked questions
Two coats at 250 sq ft/gal coverage need 400 × 2 / 250 = 3.2 gallons — three 1.5 gal kits, with a little left for touch-ups.
Typically 200–300 sq ft per coat depending on film thickness and surface porosity; the manufacturer's data sheet for your product is the authority — enter its figure.
On bare or porous concrete, a primer/sealer coat is usually recommended and counts as a coat here. Skipping it risks bubbles and peeling.
Resin and hardener must be mixed in an exact ratio; kits are pre-measured. Never split a kit by eye — weigh the parts if you must mix a partial batch.
At 250 sq ft per gallon, the wet film is about 6.4 mils (a gallon spread over 250 sq ft); high-build garage systems target 10–20 mils total across coats.