# Mixing Ratio Calculator URL: https://speedycalculator.com/calculators/chemistry/mixing-ratio/ Last updated: 2026-10-30 > The mixing ratio calculator turns a recipe of any number of ingredients into percentages, the simplest whole-number ratio and exact amounts for any batch size – for solutions, paints, resins, fuel mixes, cleaning concentrates or punch. ## Inputs - Components – one per line, name and amount - Scale the recipe by - Multiplier - Target total amount - Unit (optional, for display) ## Results - Amounts and shares - Simplest whole-number ratio - Ratio relative to the smallest component - Recipe total - Scaled total - Scale factor - Number of components - Share of each component ## Formula ``` Share of component i = aᵢ ÷ Σa × 100% · Scaled amount = aᵢ × k, with k = target total ÷ Σa (or a multiplier you choose) · simplest ratio = aᵢ ÷ gcd(a₁, a₂, …) ``` ## Explanation A mixing ratio describes how much of each ingredient goes into a mixture relative to the others – 2 : 1 epoxy, 50 : 1 two-stroke fuel, 1 : 3 : 6 concrete or 2 : 3 blue-to-yellow paint for a particular green. The ratio is independent of batch size, so the same recipe makes a spoonful or a drum as long as every part is scaled by the same factor. Working with ratios means converting between three forms. Parts (2 : 3) are easiest to remember; percentages (40% and 60%) are easiest to compare; and absolute amounts (40 mL and 60 mL for a 100 mL batch) are what you actually measure. This calculator does all three at once for up to 30 components, reduces decimal recipes such as 0.5 : 1.25 to whole numbers (2 : 5), and scales the recipe either by a multiplier or to a total you choose. Measure every component in the same unit and on the same basis – all by volume or all by mass. Mixing a volume ratio with a mass ratio is the classic source of failed resin and paint batches, because liquids have different densities. ### How to use the Mixing Ratio Calculator - **Components – one per line, name and amount** - **Scale the recipe by** - **Multiplier** - **Target total amount** - **Unit (optional, for display)** Everything is calculated in your browser, so results appear instantly and nothing you type is sent to a server. ### How it works Each line is read as a name and an amount. The calculator sums the amounts, divides each by the total for its share, divides by the greatest common divisor for the simplest whole-number ratio, and multiplies every amount by the scale factor (target total ÷ recipe total, or your multiplier). ### Worked example A paint recipe calls for 2 parts blue, 3 parts yellow and 0.5 parts white, and you need 1,000 mL. The recipe totals 5.5 parts, so one part is 1,000 / 5.5 = 181.82 mL. Blue = 2 × 181.82 = 363.64 mL (36.36%), yellow = 545.45 mL (54.55%) and white = 90.91 mL (9.09%). In whole numbers the recipe is 4 : 6 : 1. A punch recipe of 350 oz scaled to 1,000 oz uses a multiplier of 1,000 / 350 = 2.857 for every ingredient. ### How to enter components Write one component per line as a name followed by its amount, separated by a colon, an equals sign or a space – for example *Resin: 2*, *Hardener = 1* or *Water 9*. Lines with only a number are named Part 1, Part 2 and so on. Decimal amounts are fine, and the unit you type is only used for display. ## Worked example Inputs — Components – one per line, name and amount: Blue paint: 2 Yellow paint: 3 White paint: 0.5; Scale the recipe by: A target total amount; Target total amount: 1,000; Unit (optional, for display): mL. Results — Amounts and shares = Component Recipe amount Share Scaled amount ────────────────────────────────────────────────────── Blue paint 2 36.36 % 363.6364 mL Yellow paint 3 54.55 % 545.4545 mL White paint 0.5 9.09 % 90.9091 mL Total 5.5 100 % 1,000 mL; **Simplest whole-number ratio = 4 : 6 : 1**; Ratio relative to the smallest component = 4 : 6 : 1; Recipe total = 5.5; Scaled total = 1,000; Scale factor = 181.818182. ## Key terms - **Part**: One unit of a ratio; all parts in a recipe must use the same unit. - **Mixing ratio**: The relative amounts of the components of a mixture, written a : b : c. - **Scale factor**: The number every part is multiplied by to reach the batch size. - **Greatest common divisor**: The largest number that divides all parts exactly, used to simplify a ratio. ## FAQ **How do I convert a ratio to percentages?** Divide each part by the sum of all parts and multiply by 100. For 2 : 3, the total is 5 parts, so 2/5 = 40% and 3/5 = 60%. **How do I scale a mixing ratio to a batch size?** Divide the batch size by the total number of parts to get one part, then multiply. For 1,000 mL of a 2 : 3 mix, one part is 200 mL: 400 mL and 600 mL. **What does a 50 : 1 fuel mix mean?** 50 parts petrol to 1 part two-stroke oil. For 5 L of petrol you add 5 / 50 = 0.1 L (100 mL) of oil. **How do I mix a 1 : 1 ratio?** Use equal amounts of both components – each is 50% of the mixture – measured in the same unit and on the same basis. **How do I simplify a ratio with decimals?** Multiply all parts by the same power of ten and divide by their greatest common divisor. 2 : 3 : 0.5 becomes 20 : 30 : 5, then 4 : 6 : 1. **Should I mix by volume or by weight?** Follow the product instructions – epoxies and paints often list both, and they differ because densities differ. Never mix a volume ratio using a scale. **Is a mixing ratio the same as a dilution ratio?** A dilution ratio is a two-component mixing ratio where one component is the diluent (usually water). For dilutions in the lab, see the dilution factor calculator. ## Sources - [LibreTexts Chemistry](https://chem.libretexts.org/) - [OpenStax – Chemistry 2e](https://openstax.org/details/books/chemistry-2e) - [NIST – Guide for the use of the International System of Units (SP 811)](https://www.nist.gov/pml/special-publication-811)