Epoxy Resin Ratio Calculator: 1:1, 2:1, 3:1 & More

Epoxy mixing ratio tables

These tables split a total amount using the ratio exactly as written. Use ml or fluid oz when the ratio is by volume, and g or oz by weight when the ratio is by weight. Do not use these tables to convert between volume and weight.

1:1 ratio — Part A and Part B

2:1 ratio — Part A and Part B

3:1, 4:1 and 5:1 quick examples

💡 Example: if a product says 3:1 by volume, the 100-unit example means 75 ml + 25 ml. If a product says 3:1 by weight, it means 75 g + 25 g.

Epoxy resin mixing ratios by product

Brand names alone are not enough because manufacturers sell multiple formulas with different ratios. The examples below are formula-specific and use current manufacturer instructions.

⚠️ Never infer a weight ratio from the volume ratio. For example, ArtResin and MAS Table Top Pro are both 1:1 by volume, but their published weight ratios are 100:84 and 100:83 respectively.

How to calculate and measure an epoxy mix ratio

Step 1: Identify both the ratio and its basis

Read the exact product label or Technical Data Sheet. Record both the numeric ratio — such as 1:1, 2:1, 3:1 or 100:84 — and whether that ratio is specified by volume or by weight.

Step 2: Enter the ratio exactly as published

Choose a preset when it matches the manufacturer's ratio, or use Custom for ratios such as ArtResin's 100:84 by weight or MAS Table Top Pro's 100:83 by weight. Enter the total amount you want after mixing.

Step 3: Use the correct measuring tool

For a volume ratio, use appropriately sized graduated mixing cups↗. For a weight ratio, use a digital scale↗ with enough capacity and resolution for the batch. Do not put a volume ratio on a scale unless the manufacturer says the same numeric ratio is valid by weight.

Step 4: Mix according to the product instructions

Mixing time, transfer-to-a-second-cup instructions, working temperature, and maximum batch size vary by formula. Scrape the sides and bottom as directed and follow the exact manufacturer's mixing procedure rather than one universal timer.

Step 5: Pour within the product's working time

Once Part A and Part B are combined, the reaction has started. Use the product's published working-time and temperature guidance. See the resin temperature guide and epoxy resin cure time guide for product-specific planning examples.

Why the epoxy resin ratio must stay product-specific

Resin and hardener are formulated to be combined at a specific proportion. Changing that proportion can interfere with cure, but the correct numbers depend on the formula. The safest rule is simple: use the exact ratio and measurement basis published for the product.

The measurement method is part of the ratio. ArtResin demonstrates why: its 1:1 liquid-volume ratio becomes 100:84 by weight. MAS Table Top Pro likewise changes from 1:1 by volume to 100:83 by weight. Promise Table Top and WiseBond instead tell users to measure their referenced formulas by volume rather than substituting a scale-based ratio.

Resin already mixed but not curing as expected? Use the Sticky Resin & Cure Guide to diagnose ratio, mixing, temperature, and other possible causes.

Volume ratio vs weight ratio: what is the difference?

A volume ratio compares liquid volumes. A 2:1-by-volume mix could be 100 ml Part A + 50 ml Part B. A weight ratio compares mass. A 2:1-by-weight mix could be 100 g Part A + 50 g Part B. Those examples use the same numbers only because the hypothetical product specified the same numeric ratio in each basis.

In real epoxy systems, Part A and Part B often have different densities, so the numeric ratio can change when the basis changes. That is why this calculator does not convert a generic volume ratio into grams. If your product provides only a volume ratio, use volume. If it provides a weight ratio, enter that published weight ratio and use weight.