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Epoxy Resin Calculator

Running out of epoxy mid-pour can ruin a project. This calculator works out the mixed resin volume for rectangular or round pours, splits it into resin and hardener by your mix ratio and tells you how many kits to buy.

Enter your measurements

Measurements
in
in
in

Coating resins are usually poured about 1/8 in (3 mm) per layer; deep-pour resins allow much thicker pours. Check your product's maximum depth.

%

For river tables, the percentage of the mould occupied by wood that resin will not fill.

Material & assumptions

Use the ratio printed on your kit. Some products specify the ratio by weight instead.

US gal
%

Resin left in mixing cups, on tools and lost to leaks or seal coats. 10–15% is a sensible margin.

Enter your measurements and press Calculate to see quantities, a material breakdown and an optional cost estimate.

How the calculation works

  • Volume = Area × Pour depth × (1 − Insert %) × (1 + Waste %)
  • Resin = Volume × Resin parts ÷ Total parts
  • Kits = Volume ÷ Kit size (rounded up)

One US gallon is 231 in³ and one litre is 1,000 cm³. For round pours, area = π × radius².

Assumptions used

  • Pour depth is uniform.
  • The mix ratio is by volume. Products specifying ratios by weight need converting with the product's data.

Example calculation

A 48 × 24 in table top flood coat at 1/8 in deep, 1:1 ratio, no waste.

  1. 1Area: 48 × 24 = 1,152 in²
  2. 2Volume: 1,152 × 0.125 = 144 in³
  3. 3Gallons: 144 ÷ 231 = 0.62 gal
  4. 4Resin and hardener: 0.31 gal each

Result: Just over half a gallon; a 1 gallon kit covers it with margin for losses.

How to measure your project

  • Measure the inside of the mould, or the surface to coat, at its widest points.
  • For live-edge river tables, estimate the share of the mould filled by wood and enter it as the insert percentage.
  • Check the product's maximum pour depth; deep pours may need several layers.

Frequently asked questions

How much area does a gallon of epoxy cover?

At 1/8 in deep, one US gallon covers about 12.8 ft². At 1/16 in it covers about 25.7 ft².

How thick can I pour epoxy in one layer?

Coating (table-top) resins are usually limited to around 1/8–1/4 in per layer. Deep-pour casting resins can be poured much thicker. Exceeding the limit can cause overheating and cracking.

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Results are estimates based on the measurements and assumptions you enter. Always confirm product specifications, local building codes and final quantities with your supplier or a qualified professional. See our disclaimer.