Finishing calculator
Epoxy Mixing Ratio Calculator
Divide a total batch or a known component amount into the correct amount of Part A and Part B.
What the ratio means
A 2:1 ratio contains two equal measures of Part A for every one equal measure of Part B. The completed mixture has three total parts.
Formula
Part A = total × A ratio ÷ total ratio parts
Part B = total × B ratio ÷ total ratio parts
Common mistakes
- Using a ratio by weight as though it were by volume.
- Assuming 2:1 means two equal halves.
- Adding extra hardener to make it cure faster.
- Measuring a small batch with tools that are not precise enough.
Weight and volume are not interchangeable
Use the method printed by the manufacturer. A 100:45 ratio by weight may not be the same ratio by volume because the two liquids may not have the same density.