Understanding This Calculator
Epoxy floor coatings are applied in multiple thin coats rather than one thick layer, since each coat needs to cure and bond properly for a durable, chemical-resistant finish. Buying the right amount matters — epoxy kits are expensive, have a limited pot life once mixed, and running short mid-coat can leave a visible seam.
This calculator multiplies your floor area by the number of coats you plan to apply, then divides by the coverage rate listed on your specific product (which varies by porosity of the substrate and film thickness), rounding up to the next full gallon so you order enough for the whole job.
- Area floor area in square feet
- Coats number of coats to apply
- Coverage Rate sq ft covered per gallon, per coat
| Floor condition | Typical coverage | Notes |
|---|---|---|
| Sealed / dense concrete | 200-250 sq ft/gal | Less absorption, coating sits on top |
| Porous / untreated concrete | 125-175 sq ft/gal | First coat soaks in more |
Frequently Asked Questions
Why does the first coat use more epoxy than later coats?
Bare concrete is porous and absorbs some of the first coat into the surface before it builds a film. Many installers budget extra material for the base coat and use the labeled coverage rate for subsequent coats.
Should I round up or buy the exact calculated amount?
Always round up to the next full gallon or kit size, and consider a small extra margin — epoxy is mixed in fixed ratios right before application, so you can’t easily buy a partial batch mid-project if you run short.