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Resin Mix Calculator

Split your total mix into resin and hardener

How it is calculated

The total is divided in proportion to the ratio parts: resin = total × resin parts ÷ (resin parts + hardener parts) and hardener = total × hardener parts ÷ (resin parts + hardener parts). For a 2:1 ratio, enter 2 and 1. The results are in the same unit as the total (grams, millilitres, ounces) and shown with two decimals. The total must be above zero and the parts must add up to more than zero. The tool does not know whether your ratio is by weight or by volume; that is stated on the manufacturer's label and the two cannot be swapped.

Worked example

You need 300 g of mixed epoxy at a 2:1 ratio. The parts add up to 2 + 1 = 3. Resin: 300 × 2 ÷ 3 = 200.00 g. Hardener: 300 × 1 ÷ 3 = 100.00 g. Together they add up to 300 g. Weigh 200.00 of resin and 100.00 of hardener.

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Common mistakes

  • Using a by-volume ratio with weights, or the opposite. Resin and hardener have different densities, so a 2:1 by volume mix is not 2:1 by weight.
  • Entering the total as the amount of resin only. The total is the finished mix, resin plus hardener combined.
  • Swapping the two parts, putting 1 in the resin field and 2 in the hardener field, which gives twice too much hardener and a mix that may never cure properly.
  • Rounding the amounts coarsely when making a small batch. A few grams of error shifts the ratio significantly, so weigh to the decimals shown.

About this calculator

This calculator splits a target total weight (or volume) into resin and hardener portions according to a manufacturer's specified mix ratio, such as 2:1 or 1:1 by volume for casting epoxies, or ratios expressed by weight for some art resins — dividing the total into (ratio parts) equal shares and assigning resin and hardener their respective share counts.

Resin artists, jewelry makers and woodworkers casting river tables or coatings rely on hitting the exact specified ratio, since epoxy chemistry depends on a precise stoichiometric balance between resin and hardener; too much or too little hardener leaves the mix permanently tacky, cloudy or brittle instead of curing to a hard, clear finish.

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