Mixing Ratio Calculator
Split a batch of resin into part A and part B for any ratio, by volume and by weight, with the percentage each part takes.
At a glance
- What you enter
- Common ratio, Part A in the ratio, Part B in the ratio, Total mixed resin you need, Density of part A, Density of part B
- What you get
- Part A by volume, Part B by volume, Part A by weight, Part B by weight, Part A as a percentage, Part B as a percentage, Weight of the whole batch, Density of the mixed resin
- Formula shown
- Yes, every step, right below your results.
- Cost and privacy
- Free, no account needed, and nothing you type is stored.
See worked examples ↓ Read the FAQ ↓ Share this calculator ↓
Results are estimates for general information only, always verify with a professional or official source before acting on them.
How to use the Mixing Ratio Calculator
- 1 Enter Common ratio, A convenience list. The two ratio numbers below are what the calculation actually uses, so set them to whatever your product specifies.
- 2 Enter Part A in the ratio, The first number of the ratio. For 2:1 enter 2 here and 1 below.
- 3 Enter Part B in the ratio, The second number of the ratio.
- 4 Enter Total mixed resin you need (ml)
- 5 Enter Density of part A (g/ml), Resin is often near 1.1 to 1.2 grams per millilitre. Check the technical data sheet for your product.
- 6 Enter Density of part B (g/ml), Hardener is often slightly less dense than resin, near 0.95 to 1.05 grams per millilitre.
- 7 Press Calculate. You get Part A by volume, Part B by volume, Part A by weight, Part B by weight, Part A as a percentage, Part B as a percentage, Weight of the whole batch, Density of the mixed resin, and every intermediate step stays visible under "How is this calculated?"
- 8 Change one number at a time to see what moves the result, that is usually the most useful thing a calculator can tell you.
Worked examples
Real numbers run through this calculator. Open any example to load it into the form above and change it.
300 ml batch at 2:1
A 2:1 mix by volume, 300 millilitres in total, with part A at 1.15 and part B at 1.0 grams per millilitre.
You enter
- Common ratio
- 2
- Part A in the ratio
- 2
- Part B in the ratio
- 1
- Total mixed resin you need
- 300 ml
- Density of part A
- 1.15 g/ml
- Density of part B
- 1 g/ml
You get
- Part A by volume
- 200.00 ml
- Part B by volume
- 100.00 ml
- Part A by weight
- 230.00 g
- Part B by weight
- 100.00 g
- Part A as a percentage
- 66.67 %
- Part B as a percentage
- 33.33 %
- Weight of the whole batch
- 330.00 g
- Density of the mixed resin
- 1.10 g/ml
200 millilitres of part A and 100 of part B, which weigh 230 grams and 100 grams, so the batch is 330 grams.
Small 30 ml batch at 1:1
A 1:1 mix for a couple of small pieces, where the tolerance matters more.
You enter
- Common ratio
- 1
- Part A in the ratio
- 1
- Part B in the ratio
- 1
- Total mixed resin you need
- 30 ml
- Density of part A
- 1.15 g/ml
- Density of part B
- 1 g/ml
You get
- Part A by volume
- 15.00 ml
- Part B by volume
- 15.00 ml
- Part A by weight
- 17.25 g
- Part B by weight
- 15.00 g
- Part A as a percentage
- 50.00 %
- Part B as a percentage
- 50.00 %
- Weight of the whole batch
- 32.25 g
- Density of the mixed resin
- 1.08 g/ml
15 millilitres of each part, about 17.3 grams of A and 15 grams of B. This is a small enough batch that a household scale is the weak point.
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Frequently asked questions
How do I split a 2:1 mix into the two parts?
Is a 1:1 ratio by weight the same as 1:1 by volume?
What happens if the ratio is slightly wrong?
How accurate does my scale need to be?
Do I need to account for the resin left in the cup?
Terms used here
Short, plain-language definitions of the words this calculator uses.