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Tabletop & Countertop Epoxy Calculator
Coating a bar top, table or countertop? Enter the surface size and coat thickness to estimate epoxy volume. Optionally include the edges.
Formula
V (in³) = area (sq ft) × 144 × thickness (in) × coats
Edges: + perimeter × edge height × thickness × coats
1 sq ft at 1/8" = 18 in³ ≈ 9.97 fl oz
1 gallon at 1/8" ≈ 12.8 sq ftCoverage at common thicknesses
| Thickness | Per sq ft | Sq ft per US gallon (theoretical) |
|---|---|---|
| 1/32" | 4.5 in³ ≈ 2.5 fl oz | 51.3 |
| 1/16" | 9 in³ ≈ 5.0 fl oz | 25.7 |
| 1/8" | 18 in³ ≈ 10.0 fl oz | 12.8 |
| 1/4" | 36 in³ ≈ 19.9 fl oz | 6.4 |
Theoretical values; runoff over edges, absorption into porous wood and leftover in cups reduce real coverage.
Seal coat first
Bare wood is porous and can release air into a flood coat. A thin seal coat brushed or spread on first helps limit bubbles. Many self-leveling tabletop epoxies settle around 1/8 inch per coat; check your product's recommended thickness. Estimating the budget? See epoxy countertop cost per square foot.
Unit conversions used
- 1 US gallon = 231 in³ = 128 US fl oz
- 1 US fl oz = 1.8047 in³ = 29.5735 ml
- 1 in³ = 16.387 ml; 1 ft³ = 1,728 in³ ≈ 7.48 gal
- Weight = volume (cm³) × density. Many mixed epoxies are roughly 1.05–1.2 g/cm³; the default 1.1 is an approximation — check your product's technical data sheet and edit the field.
Frequently asked questions
How much epoxy do I need per square foot?
At 1/8 inch thick, one square foot needs 18 cubic inches, which is about 10 US fl oz (0.078 gallons).
How much epoxy for a countertop?
Multiply the area in square feet by 144 and by the thickness in inches to get cubic inches, then divide by 231 for gallons. A 20 sq ft countertop at 1/8 inch needs about 1.56 gallons before waste and edges.
Should I include the edges?
If the epoxy will flow over and coat the edges, yes. The calculator adds perimeter × edge height × thickness.
How thick should a tabletop epoxy coat be?
Many tabletop epoxies are designed to self-level at about 1/8 inch per coat, but follow your product's guidance.