Epoxy Resin Calculator
How much epoxy resin a river table, casting or countertop pour takes, how many kits to buy, and how much resin and hardener to measure out.
Result
Buy 4 kitsEstimate
Rounded up to whole kitsNo extra is added by default. Some epoxy always stays in the cups and soaks into the wood.
- Pour volume
- 3.74 gal (478.753 fl oz, 864 in³)
- Epoxy to mix
- 3.74 gal (478.753 fl oz, 864 in³)Estimate
- Resin to measure
- 1.87 gal (239.377 fl oz, 432 in³)Estimate
- Hardener to measure
- 1.87 gal (239.377 fl oz, 432 in³)Estimate
https://calcgallery.com/lumber-carpentry/epoxy-resin-calculator/
Results are estimates for planning only. Actual needs vary with site conditions, products and workmanship. Always confirm quantities with your supplier and follow local building codes and manufacturer instructions. Read the full disclaimer
How to use the Epoxy Resin Calculator
- Choose a rectangle or river, or a round pour.
- Enter the length and average width, or the diameter, and the depth of the pour.
- Enter the size of one kit, both parts together, and the mix ratio by volume from the label.
- Read the kits to buy and how much resin and hardener to measure out.
How it is calculated
pour volume = length × average width × depth (rectangle or river) = π × (diameter ÷ 2)² × depth (round)epoxy to mix = pour volume × (1 + allowance)kits = ⌈epoxy to mix ÷ kit size⌉resin = epoxy to mix × resin parts ÷ (resin parts + hardener parts)A US gallon is exactly 231 cubic inches, so a pour of 11 × 7 × 3 inches is exactly one gallon.
Before you pour
Seal the mould and the wood first: end grain and open knots soak up resin and release bubbles, which is where most of the extra goes. Mix only what you can pour within the working time on the label. For a thin flood coat on a tabletop, the epoxy floor coating calculator may suit better, since it works from the coverage printed on the kit rather than from a depth.
With your numbers
- Pour volume = 3.74 gal
- With 0% extra = 3.74 gal, split 1 : 1
- Kits = ⌈3.74 gal ÷ 1 gal⌉ = 4
Quick reference
No extra is added by default. Some epoxy always stays in the cups and soaks into the wood.
| Job | Kits to buy |
|---|---|
| 72 × 8 × 1 1/2 in river | 4 |
| 48 × 24 in top, 1/8 in coat, 2:1 | 2 |
| 24 in round × 1/2 in | 1 |
| 96 × 10 × 2 in river | 9 |
| 180 × 20 × 4 cm river | 4 |
| 60 cm round × 2 cm | 2 |
Common questions about the Epoxy Resin Calculator
- How many epoxy kits do I need for a river table?
- Measure the river's length, its average width and the depth of the pour. A river 72 inches long, 8 inches wide on average and 1 1/2 inches deep holds 864 cubic inches, about 3.74 US gallons, so four one-gallon kits with a little left over.
- How do I find the average width of a river?
- Measure across the gap every foot or so along its length, add the measurements and divide by how many you took. Live edges wander, so more measurements give a better average.
- My kit is mixed by weight, not volume. Can I still use this?
- Use the volume and kit count, which do not depend on the ratio. For the split between resin and hardener, follow the label. A weight ratio and a volume ratio are different numbers because the two parts have different densities, and this page does not store product densities.
- Can I pour it all at once?
- That depends on the product. Deep-pour and coating epoxies have very different maximum layer thicknesses, and pouring too deep can overheat as it cures. Check the product data sheet and pour in layers if it says so.