Resin weight vs volume
A mixing ratio has two parts: the numbers and the measurement basis. Keep both from the instructions for your exact resin product.
Equal volume does not necessarily mean equal weight
Millilitres and US fluid ounces measure liquid volume. Grams and weight ounces measure mass. A 1:1 ratio by volume asks for equal liquid volumes of Part A and Part B. It does not automatically ask for equal weights.
Component densities can differ. ArtResin, for example, publishes 1:1 by volume and 100:84 by weight. That example belongs to that formula; it is not a preset for every resin with “1:1” on the bottle.
276 g at 100:84 by weight
There are 184 total ratio parts. Part A = 276 × 100 ÷ 184 = 150 g. Part B = 276 × 84 ÷ 184 = 126 g. Together: 276 g.
Which number should you enter?
| Your label says | Measure with | Enter in the tool |
|---|---|---|
| 2:1 by volume | Graduated containers | Volume, 2 parts A and 1 part B |
| 100:43 by weight | A suitable scale | Weight, 100 parts A and 43 parts B |
| Only 1:1, with no basis | Check the exact product instructions | Confirm the basis before calculating |
Can I turn mold volume into grams?
Density is mass divided by volume. If a mixed material has a documented density of 1.10 g/mL, 100 mL corresponds to an estimated 110 g of mixed material. This is a hypothetical density example, not a recommended setting.
A mixed density alone does not establish the separate component weights for a volume ratio. You need the manufacturer’s weight ratio or adequate component-density information. ResinBatch therefore keeps mold volume and known-weight ratio calculations separate.
Calculate your batch
Use the mold and batch calculator to find the total volume. If you already know the total amount and the product ratio, use the mixing ratio calculator.