How the split works
A 2:1 ratio by volume has three parts in total: two parts resin A and one part hardener B. For 3 US gallons, that is 2 gallons of A and 1 gallon of B.
Resin A = total × A parts ÷ (A parts + B parts)
The same calculation works in liters. You can enter a custom ratio when your product requires one.
Check the label first
Always follow the mixing ratio specified by your epoxy manufacturer. Some products specify ratios by weight instead of volume; this calculator is for volume ratios only. Do not change the ratio to adjust cure time.
Need to find the total first? Use the epoxy volume calculator.