Epoxy Calculator

How much epoxy resin you need for a river table, mould or floor coating: volume in gallons, fl oz or litres, split into resin and hardener.

Epoxy is measured by volume. For a pour, such as a river table or a mould, the volume is length × width × depth: a river 6 ft long, 6 in wide and 1.5 in deep is 0.375 cubic feet, about 2.8 US gallons, before extra. For a coating, it's area × thickness: one US gallon spread 1 mil (a thousandth of an inch) thick covers 1,604 ft², so a 10 mil floor coat covers about 160 ft² per gallon, and a 1/8 in flood coat on a tabletop covers about 12.8 ft² per gallon. Products with less than 100% solids leave a thinner dry film, so you need more. Enter your pour or surface and the mix ratio, and the calculator gives the total and how much resin and hardener to mix.

Units
Job
Pour
ft
ft
in
Feet and inches work too: type 12'6 or 12.5.
%
Mixed epoxy
3.09 gal

11.68 L · 395 fl oz

Part A (resin)
1.54 gal

197.5 fl oz

Part B (hardener)
1.54 gal

197.5 fl oz

How it was worked out
  1. Area: 6 ft × 0.5 ft = 3 ft²; × 1.5 in (0.125 ft) deep = 0.37 ft³
  2. Plus 10% for mixing cups, edges and drips = 3.09 gal
  3. Mixed 1 : 1 by volume: 1.54 gal resin (part A) + 1.54 gal hardener (part B)

Deep pours need a deep-pour resin and are often poured in layers: never pour deeper than the product's maximum in one go. Weigh or measure by volume exactly as the maker says, as ratios by weight and by volume differ.

Common use cases

  • A river table or live-edge slab pour
  • Moulds, coasters and resin art
  • Garage floor and concrete floor coatings
  • Bar tops and tabletop flood coats

How to use

  1. Choose Pour for river tables and moulds, or Coating for floors and tabletops.
  2. Enter the size and depth of the pour, or the area and coat thickness.
  3. Choose the mix ratio from the product (1:1, 2:1 or 3:1 by volume) and the extra.
  4. Read the total epoxy and the amounts of resin (part A) and hardener (part B).

FAQ

How much epoxy do I need for a river table?

Multiply the river's length × average width × depth. In inches, divide cubic inches by 231 for US gallons; in centimetres, divide cubic centimetres by 1,000 for litres. Add about 10% for the mixing cups, edges and leaks into the mould.

How far does a gallon of epoxy go?

For a coating at 100% solids: 1,604 ft² at 1 mil, about 160 ft² at 10 mils and about 12.8 ft² at 1/8 in. In metric, a litre covers 1 m² at 1 mm thick.

How deep can I pour epoxy?

Each product has a maximum depth per pour; going deeper can overheat, crack or yellow the resin. Deep-pour resins are made for thick pours, and coating resins are usually poured in thin layers. Follow the product's limits.

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