Countertop Epoxy Calculator
Add your counter sections, the front edge height and your coats. You get the epoxy for the top and edges, the number of kits and what it costs.
Epoxy needed
– gal
– sq ft of top and edge
| Seal coat | – |
| Flood coat(s) | – |
| Resin + hardener (1:1) | – |
| Kits to buy | – |
| Cost | – |
Next steps
Table tops and bar topsWhen the counter can be usedHow thick will the epoxy you have go?How to use this calculator
- Measure each counter run along the wall and its depth. Add an island as the third section.
- Enter the edge height and the total length of edges the epoxy will run over (usually the front edges).
- Choose a seal coat for porous surfaces and how many flood coats you plan.
How the calculation works
- Area = sum of (length × depth) + edge length × edge height
- Gallons per coat = area × thickness ÷ 231, plus the extra for drips
- Kits = total gallons ÷ gallons per kit, rounded up
Cut-outs for sinks and cooktops are not subtracted: the extra helps cover their edges.
Epoxy for common counter runs
25.5 inch deep, 1.5 inch front edge, one 1/8 inch flood coat, 15% extra:
| Counter length | Gallons |
|---|---|
| 6 ft | 1.2 |
| 8 ft | 1.6 |
| 10 ft | 2 |
| 12 ft | 2.4 |
| 15 ft | 3 |
Tips for epoxy countertops
- Tape plastic under the edges to catch drips, and run a gloved finger or foam brush along the edge to smooth them.
- Remove the sink and cover the cooktop opening before pouring.
- Epoxy is not heat proof. Use trivets for hot pans even after a full cure.
Frequently asked questions
How much epoxy do I need for a countertop?
A 10 ft run of standard 25.5 inch deep counter with a 1.5 inch front edge needs about 2 gallons for one 1/8 inch flood coat, including 15% for drips off the edges.
How many square feet does a gallon of countertop epoxy cover?
About 12.8 square feet at 1/8 inch. Edges and drips use part of that, so most kits list 10–12 sq ft per gallon for a flood coat.
Do I need a seal coat before the flood coat?
On porous surfaces such as wood, laminate with seams or old tile, a thin seal coat stops air bubbles rising into the flood coat. Leave the seal coat at 0 if your surface is already sealed.
How thick should countertop epoxy be?
Most countertop epoxies self-level at about 1/8 inch per coat. Some designs add a second flood coat for more depth; add it in the calculator if your plan has one.