How Much Epoxy for a Coffee Table? (Common Sizes in Gallons)
Updated 2026-10-26
Coffee tables are a frequent first furniture pour: big enough to need real gallon math, small enough to finish in a weekend. Typical tops run 36-60 inches long and 18-30 inches deep, finished with a 1/8 inch clear flood coat (or thicker if you are filling a live-edge slab face). This page lists common sizes, shows the arithmetic, and points you to the calculators for custom dimensions.
Use the tabletop epoxy calculator for any length x width x thickness. River-gap fills belong on the river table calculator; full-slab thick casts may need the deep pour calculator.
The formula
Volume (in3) = length (in) x width (in) x thickness (in)
Gallons = in3 / 231 Fl oz = in3 / 1.8047 Liters = in3 x 0.016387
Common coffee table sizes - 1/8 inch flood coat
| Top size (in) | Area (sq ft) | Volume (in3) | Gallons | Fl oz | +10% gal |
|---|---|---|---|---|---|
| 36 x 18 | 4.5 | 81 | 0.35 | 44.9 | 0.39 |
| 40 x 20 | 5.56 | 100 | 0.43 | 55.4 | 0.48 |
| 48 x 24 | 8.0 | 144 | 0.62 | 79.8 | 0.69 |
| 54 x 28 | 10.5 | 189 | 0.82 | 104.7 | 0.90 |
| 60 x 30 | 12.5 | 225 | 0.97 | 124.7 | 1.07 |
Same sizes at 1/4 inch (two coats or a thicker build)
| Top size (in) | Volume (in3) | Gallons | +10% gal |
|---|---|---|---|
| 36 x 18 | 162 | 0.70 | 0.77 |
| 48 x 24 | 288 | 1.25 | 1.37 |
| 60 x 30 | 450 | 1.95 | 2.14 |
Confirm that your coating epoxy allows 1/4 inch in one pour; many tabletop products prefer about 1/8 inch per coat and a recoat for more thickness. See seal coat vs flood coat and deep pour vs tabletop epoxy.
Worked example: 48 x 24 inch coffee table
- Area: 48 x 24 = 1,152 in2 (8 sq ft).
- Flood coat at 1/8 inch: 1,152 x 0.125 = 144 in3.
- Gallons: 144 / 231 = 0.62 gal (about 80 fl oz).
- Edges: perimeter 2 x (48 + 24) = 144 in; 1.5 in apron at 1/16 in gives 144 x 1.5 x 0.0625 = 13.5 in3 which is about 0.06 gal.
- Subtotal: 144 + 13.5 = 157.5 in3 which is about 0.68 gal.
- Waste 10%: 0.68 x 1.10 is about 0.75 gal for the flood coat.
- Optional seal coat at about 1/32 inch on the face: 1,152 x 0.03125 is about 36 in3 which is about 0.16 gal (+10% is about 0.17 gal).
- Combined about 0.92 gal, so a 1-gallon kit is the usual purchase; buy 1.5 gal if you want a comfortable buffer or a second flood coat.
1:1 mix of 0.75 gal total means 0.375 gal A + 0.375 gal B. 2:1 mix means 0.50 gal A + 0.25 gal B (by volume).
Live-edge slabs vs flat tops
A live-edge coffee table with only a surface coating still uses the rectangle (or measured area) x thickness method above. If you are filling cracks and voids in the slab, estimate those cavities separately - see how much epoxy to fill wood cracks. A true river coffee table (resin channel between two slabs) uses river-gap volume, not full-top volume: how much epoxy for a river table.
Round and oval coffee tables
Round: V = pi x (diameter / 2)^2 x thickness
Oval (approx): V is about pi x (length / 2) x (width / 2) x thickness
Example: 42 inch round top at 1/8 inch: pi x 21^2 x 0.125 is about 173 in3 which is about 0.75 gal before waste.
Coverage shortcut
At 1/8 inch, one gallon covers about 12.8 sq ft of face area. A 8 sq ft coffee table therefore needs about 8 / 12.8 = 0.63 gal for the face - matching the 48 x 24 row. At 1/16 inch, coverage is about 25.7 sq ft per gallon. Full tables: epoxy coverage per gallon.
Face gallons = (sq ft x thickness_inches x 144) / 231
= sq ft / (231 / (thickness_inches x 144))
Comparing coffee table vs bar top vs 4x8
- Coffee table (8 sq ft, 1/8 in): about 0.6 gal face.
- Bar top (16 sq ft, 1/8 in): about 1.25 gal face - see how much epoxy for a bar top.
- 4x8 sheet (32 sq ft, 1/8 in): about 2.5 gal face - see how much epoxy for a 4x8 table.
Volume scales with area at fixed thickness, so once you trust one worked example you can proportion to any similar top.
Embedded objects and trays
Photo embeds, bottle caps or a recessed serving tray cut into the top displace resin. Measure the recess volume (L x W x depth) and subtract it from the flood volume if that recess is not being filled, or add it if you are filling the recess as a separate pour. Tray molds themselves are best measured with water: water method.
Buying checklist
- Calculate face volume at your target thickness.
- Add edge/apron volume if coating sides.
- Add a separate seal-coat estimate for bare wood.
- Apply 8-15% waste (see waste percentage guide).
- Split by mix ratio; round up to whole kits.
- Confirm max pour depth, recoat window and cure temperature on the TDS; read the SDS before mixing.
Summary
A typical 48 x 24 inch coffee table needs about 0.62 gallons for a 1/8 inch face coat; edges, seal coat and 10% waste bring a realistic order near 1 gallon. Scale with area and thickness, round up to kit sizes, and always follow the product TDS/SDS for max pour depth, mix ratio and cure conditions.