Mix Ratio Calculator
Enter your total amount needed and the mix ratio (like 2:1) to calculate how much of each component to use.
Last updated: September 5, 2026
Frequently asked questions
How do I calculate a 2:1 epoxy mix for 300ml total?
Divide 300 by (2+1)=3 to get 100 per unit, then multiply: Part A = 100×2 = 200ml, Part B = 100×1 = 100ml.
Does it matter if I mix by weight or by volume?
Yes - always check the product's instructions. Some epoxies and paints specify ratios by volume, others by weight, and using the wrong basis can produce an incorrectly cured or mixed product even if you follow the numeric ratio correctly.
What happens if I get the mix ratio wrong?
For epoxy and other reactive products, an incorrect ratio can prevent proper curing, leaving the mixture tacky, brittle, or never fully hardening - unlike simple dilutions, these reactions typically need close to the exact specified ratio to work correctly.
Can I use this for paint tinting or other non-reactive mixes too?
Yes - the same proportional math applies to any two-part mix ratio, reactive or not, including paint tinting, cleaning solution dilution, or fuel-oil mixes for 2-stroke engines.
How do I calculate a 3:1 mix for 500ml total?
500 ÷ (3+1) = 125 per unit. Part A = 125 × 3 = 375ml, Part B = 125 × 1 = 125ml.
What if my container only measures one component - can I still hit the ratio?
Yes - measure out Part A to the amount this calculator gives, then add Part B up to that same combined total if you're using a single graduated container, or measure both separately if precision matters more, such as with fast-curing epoxy where getting the ratio slightly wrong affects cure quality.
How is a mix ratio like 2:1 different from a percentage-based ratio like 33%?
A 2:1 ratio means for every 2 parts of A there's 1 part of B, while a percentage ratio states each component's share of the whole - 2:1 is equivalent to Part A being 66.7% and Part B being 33.3% of the total, which this calculator's 'ratio simplified' output can help you cross-check.