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Epoxy Resin & Hardener Volume Calculator

Calculate required Epoxy Resin & Hardener in grams/ml based on mold dimensions and mix ratio (2:1, 3:1, 1:1).

cm
cm
cm

Check whether your product specifies the ratio by weight or by volume.

g/cm³
%
Mould volume
1,200 ml
1.20 litres
Resin (part A)
968 g
Hardener (part B)
484 g
Total mixture
1,452 g
Includes 10% wastage

Epoxy Resin & Hardener Volume Calculator: how it works

Epoxy quantity is volume times density, split by the mix ratio. The constraint that catches people out is maximum pour depth.

Calculating quantity

Total grams = L × W × D × density × (1 + wastage)

Dimensions in centimetres give millilitres directly
Epoxy density is typically 1.1 g/cm³

Resin = Total × ratio_A ÷ (ratio_A + ratio_B)

Hardener is the remainder

Worked example

Worked example · A 30 × 20 × 2 cm mould at 2:1

Given

  • Mould: 30 × 20 × 2 cm
  • Ratio: 2:1
  • Density: 1.1 g/cm³
  • Wastage: 10%

Working

  1. 1Volume = 30 × 20 × 2 = 1200 ml
  2. 2Mass = 1200 × 1.1 × 1.10 = 1452 g
  3. 3Resin = 1452 × 2 ÷ 3 = 968 g
  4. 4Hardener = 1452 − 968 = 484 g

968 g resin, 484 g hardener

Pour depth is the real limit

For deeper castings, either use a deep-pour formulation designed for the purpose, or pour in layers, letting each cure until tack-free before adding the next.

Getting a good result

  • Measure by weight, not volume, unless the product specifies volume. The two ratios differ.
  • Mix thoroughly for the full time specified — under-mixing leaves soft, sticky patches that never cure.
  • Scrape the sides and bottom of the mixing vessel; unmixed resin clinging there is the commonest cause of failure.
  • Warm resin flows better and releases bubbles more readily, but cures faster, shortening working time.

Frequently asked questions

Multiply length by width by depth in centimetres for millilitres, multiply by density of about 1.1 g/cm³, then split by your mix ratio. Add 10 percent for wastage.

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