How this instrument works
A mixing ratio is just a way of describing how much of each ingredient goes into a combined whole — 2 parts blue paint to 1 part yellow, or 100 fl oz of pineapple juice to 200 fl oz of apple juice to 50 fl oz of grenadine. On its own, a ratio like that doesn't tell you what fraction of the finished mixture each component actually is; for that you need to divide each amount by the total of all amounts combined, then multiply by 100 to express it as a percent.
That's the entire calculation this instrument runs, for up to three components at once: it adds every amount you enter to get the mixture's total, then reports each component's amount as a percentage of that total. The units you use for the amounts don't matter — fluid ounces, grams, parts by weight, cups — as long as every component is measured in the same unit, since the percentages come out of a ratio and the units cancel.
This kind of breakdown shows up anywhere something is blended from named components: cocktail and food recipes, paint and dye mixing, concrete and mortar mix ratios, fertilizer blends, and simple lab mixtures where you already know the amount of each substance rather than needing to solve for it. It's a more general, table-of-parts tool than a dilution calculation, which instead solves for an unknown volume needed to hit a target concentration.
- Enter the amount of the first substance into Amount of substance A, using any consistent unit (grams, fluid ounces, parts).
- Enter the amount of the second substance into Amount of substance B, in that same unit.
- Enter the amount of the third substance into Amount of substance C, in that same unit — enter 0 if your mixture only has two components.
- Read Substance A (%), Substance B (%), and Substance C (%) below the inputs; the three always add up to 100%.
- For a mixture with more than three components, group two of the closest-related ones together into a single amount before entering it, since this calculator handles exactly three.
Worked example — a three-juice punch recipe
Enter 100 into Amount of substance A (100 fl oz pineapple juice), 200 into Amount of substance B (200 fl oz apple juice), and 50 into Amount of substance C (50 fl oz grenadine). The total mixture comes to 350 fl oz, and the calculator reports Substance A (%) = 28.57%, Substance B (%) = 57.14%, and Substance C (%) = 14.29%.
Those three percentages describe the punch's composition independent of batch size — scale the whole recipe up to make five gallons instead of 350 fl oz, and as long as you keep the same 100:200:50 amounts relative to each other, the percentages stay exactly 28.57% / 57.14% / 14.29%. That's the practical value of converting raw amounts into percentages: it separates the recipe's proportions from whatever total batch size you happen to be making.
Questions
Do the three percentages always add up to 100%?
Yes, by construction — every component's percentage is that component's amount divided by the sum of all three amounts, so adding the three percentages back together necessarily reconstructs the whole mixture, which is 100% of itself. If your displayed percentages don't sum to almost exactly 100% (allowing for rounding), double-check that every amount was entered in the same unit.
What if my mixture only has two components?
Enter 0 into Amount of substance C. With C set to zero, that component's percentage comes out to 0% and the total mixture size is just A plus B, so the calculator behaves exactly like a two-component ratio-to-percentage tool without needing a separate two-input version.
Does the unit I use for the amounts matter?
No, as long as every amount uses the same unit. Because each percentage is a ratio of one amount to the sum of all amounts, any consistent unit — grams, fluid ounces, cups, liters, parts by weight — cancels out of the calculation entirely. Mixing units (entering one amount in grams and another in ounces) will silently produce a wrong answer, since the calculator has no way to know the amounts aren't already comparable.
How is this different from a dilution calculation?
This tool converts known amounts into percentages of a mixture you're building from named quantities — you already know how much of each thing you're combining, and just want each one's share of the whole. A dilution calculation instead works backward: you know a target concentration and volume, and solve for the unknown volume of stock solution needed to reach it. Use this one for describing an existing recipe or blend; use a dilution formula when you're trying to hit a specific target concentration.
Can I use this for a mixture with more than three ingredients?
Not directly with three separate percentages, since this instrument is fixed at three components. A practical workaround is to combine two closely related ingredients into a single combined amount before entering it — for instance, lumping 'sand' and 'gravel' together as one 'aggregate' amount in a concrete-mix calculation — which reduces a four-ingredient mixture to three inputs at the cost of losing the breakdown between those two combined ingredients.