Resin Mix Ratio Calculator
A 2 : 1 resin divides the total into three shares — two of resin, one of hardener — so 220 g is 146.7 g of A and 73.3 g of B. The ratio here is by weight. Products routinely print both, a 2 : 1 by volume alongside 100 : 45 by weight, so read the weight figure when you are working on a scale.
Your numbers
Part A
146.7g
Part B
73.3g
Formula
Part A = Resin needed × Ratio part A ÷ (Ratio part A + Ratio part B)
Off-ratio resin does not cure. Extra hardener does not make it harder; it stays tacky, or the heat concentrates and it cracks. Use a scale that reads to 0.1 g, and for small pours under about 20 g mix a little extra and pour from it, because the error weighs more than the resin does. Decanting into a second cup shifts the ratio by whatever stayed in the first.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Resin needed (g)Resin needed in total, parts A and B together. | 220 | 1 and up |
| Ratio part AThe A side of the mix ratio. | 2 | 0.1 and up |
| Ratio part BThe B side of the mix ratio. | 1 | 0.1 and up |
Step by step
Quick reference table
Results when only Resin needed (g) changes and everything else stays put.
| Resin needed (g) | Part A (g) | Part B (g) |
|---|---|---|
| 110 | 73.3 | 36.7 |
| 165 | 110 | 55 |
| 220 | 146.7 | 73.3 |
| 330 | 220 | 110 |
| 440 | 293.3 | 146.7 |
What each result means
| Result | At default values |
|---|---|
| Part A (g)How much part A to weigh out. | 146.7 |
| Part B (g)How much part B; eyeballing this is why resin fails to cure. | 73.3 |
Common mistakes
Off-ratio resin does not cure. Extra hardener does not make it harder; it stays tacky, or the heat concentrates and it cracks. Use a scale that reads to 0.1 g, and for small pours under about 20 g mix a little extra and pour from it, because the error weighs more than the resin does. Decanting into a second cup shifts the ratio by whatever stayed in the first.
Glossary
- Resin needed
- Resin needed in total, parts A and B together.
- Ratio part A
- The A side of the mix ratio.
- Ratio part B
- The B side of the mix ratio.
- Part A
- How much part A to weigh out.
- Part B
- How much part B; eyeballing this is why resin fails to cure.
Frequently asked questions
Q. How is Resin Mix Ratio Calculator calculated?
Part A = Resin needed × Ratio part A ÷ (Ratio part A + Ratio part B) — A 2 : 1 resin divides the total into three shares — two of resin, one of hardener — so 220 g is 146.7 g of A and 73.3 g of B. The ratio here is by weight. Products routinely print both, a 2 : 1 by volume alongside 100 : 45 by weight, so read the weight figure when you are working on a scale.
Q. Can you walk through an example?
With Resin needed 220g, Ratio part A 2, Ratio part B 1, the answer is Part A 146.7g.
Q. What do I need to enter?
Enter Resin needed, Ratio part A, Ratio part B. The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Resin needed (g) moves the answer to Resin needed (g) 110 → Part A (g) 73.3 and Resin needed (g) 440 → Part A (g) 293.3. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
Off-ratio resin does not cure. Extra hardener does not make it harder; it stays tacky, or the heat concentrates and it cracks. Use a scale that reads to 0.1 g, and for small pours under about 20 g mix a little extra and pour from it, because the error weighs more than the resin does. Decanting into a second cup shifts the ratio by whatever stayed in the first.
Related calculators
Materials differ in density and absorption. If your label states a figure, use it — the defaults here are only common values.