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Epoxy mixing ratio calculator for resin and hardener. Calculate 1:1, 2:1, 3:1 mixes by volume or weight with simple formulas and examples.
An epoxy mixing ratio calculator helps you find the right amount of resin and hardener for a two-part epoxy system. It can calculate the mix by total amount, resin amount, or hardener amount.
Our resin mixing ratio calculator supports both volume and weight. You can enter a ratio such as 1:1, 2:1, 3:1, or 5:1. The calculator then gives the required resin, hardener, and total mixed amount.
This makes it easy to calculate epoxy resin amount for crafts, coating, casting, repairs, and other epoxy projects.
The basic epoxy and hardener ratio is written as:
Resin : Hardener = A : B
If the total epoxy amount is known, use:
Resin = Total × A ÷ (A + B)
Hardener = Total × B ÷ (A + B)
Total = Resin + Hardener
If the resin amount is known:
Hardener = Resin × B ÷ A
Total = Resin + Hardener
If the hardener amount is known:
Resin = Hardener × A ÷ B
Total = Resin + Hardener
These formulas are the core calculation used by this epoxy resin ratio calculator.
Enter the resin ratio in the A field and the hardener ratio in the B field. For example, enter 2 and 1 for a 2:1 epoxy mix ratio.
Select Volume or Weight. Volume can use fl oz, mL, L, cups, or US gallons. Weight can use g, kg, oz, or lb.
Select whether you know the total amount, resin amount, or hardener amount.
Enter the known epoxy quantity. The value must be greater than zero.
Click the calculate button. The calculator shows the required resin, hardener, and total mixed amount.
Suppose you have a 2:1 epoxy resin and hardener mixing ratio. You want 30 fl oz of mixed epoxy.
First, add the ratio parts:
2 + 1 = 3
Now calculate the resin:
Resin = 30 × 2 ÷ 3
Resin = 20 fl oz
Now calculate the hardener:
Hardener = 30 × 1 ÷ 3
Hardener = 10 fl oz
Therefore:
20 fl oz resin + 10 fl oz hardener = 30 fl oz total
So, for a 2-part epoxy mix, you need 20 fl oz of resin and 10 fl oz of hardener.
The same method works with an epoxy calculator in ounces or an epoxy resin calculator in mL. Just keep the units consistent.
An epoxy mixing ratio calculator removes the guesswork from two-part epoxy mixing. Enter the correct manufacturer-specified resin-to-hardener ratio, select volume or weight, enter your known amount, and calculate.
The key formula is:
Resin = Total × A ÷ (A + B)
Hardener = Total × B ÷ (A + B)
Always use the mixing ratio stated for your specific epoxy product. Some products use different ratios by volume and by weight.
An epoxy mixing ratio tells you how much resin to mix with how much hardener. A 2:1 ratio means 2 parts resin for every 1 part hardener.
For a 2:1 ratio, divide the total amount into three parts. Two parts are resin and one part is hardener.
For a 2:1 ratio:
Hardener = 20 × 1 ÷ 2 = 10 oz.
So you need 10 oz of hardener.
Yes. Select volume and use mL as the unit. The calculation works the same way.
Yes. Select weight and enter the correct weight-based ratio for your epoxy product.
No. Epoxy manufacturers use different mixing ratios. Always check the product instructions before mixing.