Epoxy Science

Interactive planning tool

Epoxy mix ratio calculator

Split a planned batch into Component A and Component B using the exact ratio and measurement basis printed in the product instructions. Weight and volume remain separate.

Measurement mode

Choose the mode specified by the manufacturer. The calculator does not convert between volume and weight.

Ratio and batch
Examples only. Select the product's specified ratio.
Enter the total amount of mixed material you plan to make.

Calculated batch

Component amounts

Enter a valid planned amount. Results update when you calculate or change a completed input.

Component A
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Component B
—
Total
—
Mode
Volume
Ratio
2:1

Planning arithmetic only. Confirm the product ratio, measurement basis, allowable batch size, and mixing instructions before use.

How the calculator divides a batch

For a manufacturer-specified ratio A:B and target total T, the calculator uses:

  • Component A = T × A ÷ (A + B)
  • Component B = T × B ÷ (A + B)

If you know only A, it calculates B = known A × B ÷ A. If you know only B, it calculates A = known B × A ÷ B. All displayed values retain the unit you selected; no physical-unit conversion occurs.

Use the ratio from the exact product

The 1:1, 2:1, and 3:1 presets are arithmetic shortcuts, not recommendations. Confirm which component is A, which is B, and whether the ratio is stated by volume or by weight. The detailed epoxy mix-ratio guide explains the chemistry and common interpretation errors.

A 2:1 volume ratio is not automatically 2:1 by weight. Component densities can differ. This calculator intentionally does not perform density conversion because a mathematically derived value does not establish that the manufacturer permits weight batching.

Worked examples

For a product documented as 2:1 by volume and a target total of 750 mL, the three total ratio parts are 250 mL each. Component A is 500 mL and Component B is 250 mL.

For a product documented as 100:44 by weight and a target total of 720 g, Component A is 500 g and Component B is 220 g. That example does not mean every product labeled 2:1 by volume has a 100:44 weight ratio.

What the result does not establish

  • It does not identify the correct ratio or component order.
  • It does not define acceptable measuring error.
  • It does not prove a scale or cup is accurate enough.
  • It does not approve partial kits or establish minimum/maximum batch size.
  • It does not determine working time, cure speed, or safe batch mass.
  • It does not confirm that pumps are calibrated for the selected system.

Choose measuring equipment after the calculation

The smallest component amount is the demanding number. It must be large enough for the selected cup graduations, scale performance, or approved dispensing system. The measuring-tools and scales guide compares equipment by capacity, resolution, verification, vessel fit, and system compatibility.

Future commercial modules may connect a documented product ratio to suitable cups, scales, pumps, containers, mixers, and timers. No product data, retailer destination, or affiliate link is preloaded. Review the affiliate disclosure and return to the tools hub for related calculators.

Safety and privacy

The calculator runs entirely in your browser. It has no form action, network request, storage, account, analytics event, or data submission. Values are kept only in the page while it is open and are cleared by Reset or navigation.

Calculation is not a safety assessment. Review the exact resin and hardener SDSs and instructions. Do not change the ratio to control cure speed, and do not exceed documented batch limits; reacting epoxy can build heat in a contained mass.

Sources

Sources accessed September 2026. Verify the current TDS, label, and instructions for the exact product before measuring.