How to use epoxy mix ratio calculator
What this calculation does
A mix-ratio split divides a target batch between resin and hardener according to entered ratio parts on a compatible mass or volume basis.
Select mass or volume, choose a compatible unit, then enter total batch amount and the exact product ratio.
Enter the measurements
- Mixing basis: Choose the mass or volume basis specified by the product maker.
- Entered quantity unit: Select a unit compatible with the chosen mass or volume basis.
- Total mixed batch amount: Enter the total mixed batch in the selected unit.
- Resin ratio parts: Enter resin parts from the product instructions.
- Hardener ratio parts: Enter hardener parts from the same instructions.
Formula and variables
Resin amount = total × resin parts ÷ (resin parts + hardener parts). Hardener amount = total × hardener parts ÷ (resin parts + hardener parts).
Each component equals total amount times its own parts divided by total ratio parts. Mass and volume units are not converted into one another.
Read the result
A 24 US fl oz batch at 2:1 by volume contains 16 fl oz resin and 8 fl oz hardener.
Worked example
Inputs: 24 U.S. fl oz total at a 2:1 volume ratio
- Total parts = 2+1 = 3.
- Resin = 24×2÷3 = 16 fl oz; hardener = 24×1÷3 = 8 fl oz.
Expected result: 16 U.S. fl oz resin and 8 U.S. fl oz hardener
Frequently asked questions
Can I use a 2:1 ratio for any epoxy?
No. Use the exact ratio and basis specified for the selected product.
Can the calculator convert mass to volume?
No. Select a unit compatible with the chosen basis.
Conditions, presets and technical notes
Use the exact manufacturer ratio and its specified volume or mass basis. Select a unit compatible with that basis; this calculator does not convert mass to volume, infer a product ratio, account for pot life or authorize a different product mix.