Epoxy calculator
How much epoxy resin a tabletop, art piece or river table takes, split into resin and hardener, or how many kits a garage floor needs.
You need
83.8 fl oz
- Resin (part A)
- 41.9 fl oz
- Hardener (part B)
- 41.9 fl oz
- Mix ratio
- 1:1 by volume
- Total
- 0.65 gal, 2.62 qt
- Metric
- 2,478 ml (2.48 L)
- Pours
- 1 (up to 1/4 in. each)
- Floor area
- 0 sq ft
- Coating
- 0.00 gal in kits
- Estimated cost
Volume is length × width × depth (fl oz = gallons × 128). Mix by volume at your product's ratio, and pour no thicker than its maximum layer; deeper pours are done in layers after each one sets. Check your product's label: ratios and limits differ. Kits = area × coats ÷ the coverage on the kit's label; rough or porous concrete covers less. Gallons are for the 240 fl oz kit cited below.
How much epoxy do I need?
Epoxy is measured by volume: the area you're covering times how thick the resin will be. Then split it by the mix ratio printed on your kit.
- Volume = length × width × depth, all in inches = cubic inches (round: π × diameter² ÷ 4 × depth)
- Gallons = cubic inches ÷ 231; fl oz = gallons × 128; ml = cubic inches × 16.387
- Resin and hardener: split by the ratio, e.g. 1:1 is half and half, 2:1 is two-thirds resin
- Floor kits = area × coats ÷ coverage per kit
Worked example
A 48 × 24 in. tabletop with one 1/8 in. coat is 48 × 24 × 1/8 = 144 cubic inches. Divided by 231, that's 0.623 gallons, or 79.8 fl oz: 39.9 fl oz of resin and 39.9 fl oz of hardener at 1:1. A river channel 72 in. long, 8 in. wide on average and 1.5 in. deep is 864 cubic inches, 3.74 gallons of deep pour resin.
Epoxy for common tabletop sizes
One 1/8 in. coat, no extra.
| Size | fl oz | Gallons | ml |
|---|---|---|---|
| 12 × 12 in. | 10.0 | 0.078 | 295 |
| 24 × 24 in. | 39.9 | 0.312 | 1,180 |
| 48 × 24 in. | 79.8 | 0.623 | 2,360 |
| 60 × 30 in. | 124.7 | 0.974 | 3,687 |
| 72 × 36 in. | 179.5 | 1.403 | 5,309 |
Epoxy per square foot by depth
| Depth | fl oz per sq ft | ml per sq ft |
|---|---|---|
| 1/8 in. | 10.0 | 295 |
| 1/4 in. | 19.9 | 590 |
| 1/2 in. | 39.9 | 1,180 |
| 1 in. | 79.8 | 2,360 |
| 2 in. | 159.6 | 4,719 |
Mix ratios and layer limits
| Resin | Mix by volume | Thickest layer | Source |
|---|---|---|---|
| Tabletop or art coating | 1:1 | 1/4 in. | ArtResin |
| Deep pour (river table, casting) | 2:1 | 2 in. | TotalBoat Fathom |
Two examples, not every brand: each product's label gives its own ratio and limit. Floor kit coverage: Rust-Oleum EpoxyShield 2-part garage floor kit, 240 fl oz (Lowe's listing), up to 500 sq ft per kit.
Epoxy questions
How much epoxy do I need for a table top?
For one 1/8 in. coat, about 80 fl oz for a 48 × 24 in. table (2,360 ml): length × width × depth in inches, divided by 231 for gallons. ArtResin self-levels to 1/8 in. on a flat surface; for a thicker look, add coats rather than pouring one thick layer. Resin that runs over the edges adds to the total, so buy a little extra.
How much epoxy do I need for a river table?
Measure the river's length, its average width and its depth: a 72 in. river 8 in. wide and 1.5 in. deep takes about 3.74 gallons. River tables use deep pour resin, which TotalBoat's Fathom allows up to 2 in. deep per layer for river tables; deeper rivers are poured in layers. Seal the wood and the form first, because resin soaks in and finds gaps.
How much epoxy per square foot?
A square foot 1/8 in. deep is 18 cubic inches, about 10.0 fl oz (295 ml). Every extra 1/8 in. adds the same again; the table above lists other depths.
What is the mix ratio for epoxy resin?
It depends on the product. ArtResin mixes equal parts by volume (1:1); TotalBoat's Fathom deep pour mixes 2 parts resin to 1 part hardener by volume. Use the ratio on your kit, measure carefully and mix thoroughly; the wrong ratio can leave resin that never fully cures.
How much epoxy do I need for a garage floor?
Rust-Oleum's EpoxyShield 2.5-car kit is listed as covering up to 500 sq ft, so a 20 × 20 ft garage takes 1 kit for one coat and 1,000 sq ft takes 2. Rough or porous concrete soaks up more, and a second coat doubles it. Use the coverage on the label of the product you buy.
How much does epoxy cost?
Enter the price per gallon (or per floor kit) and the calculator multiplies it out. Resin prices vary widely by brand and kit size, and hired floor coating adds prep and labor, so compare quotes using these quantities.