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Resin and hardener mix ratio calculator

Enter the target weight of the finished mix and the weight-based mix ratio from the label (e.g. 2 parts resin to 1 part hardener). The calculator works out how much of each component to weigh out.

Result

Component A needed

—

Ratio —
Component B needed —
Batch cost —

Your inputs are stored in this browser, so everything is still here next time. Nothing is sent to a server.

This calculation is for informational purposes only and does not replace advice from a qualified professional. Formulas and rates may not fit your exact situation — double-check the figures before making decisions.

How it is calculated

Component A weight = target weight × A's parts ÷ (A's parts + B's parts); component B weight is the remainder up to the target weight. The exact ratio is always specified by the manufacturer on the label or data sheet — deviating from it changes the cured material's properties, sometimes irreversibly.

Weighing is more accurate than measuring by volume: most resins and hardeners have different densities, so equal volumes almost never give the stated weight ratio.

Batch cost = (weight A ÷ 1000 × price A) + (weight B ÷ 1000 × price B), when both prices are given.

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