Mixing Ratio Calculator

How to use the mixing ratio calculator

What this calculator does

This calculator converts two or more component amounts into their shares of one mixture, then applies one common multiplier to create a larger or smaller batch. It is useful for recipes, paints, cleaning solutions, laboratory preparations, resins, fertilizers, and any other situation where every component is measured in the same kind of unit. It reports a mathematical proportion; it does not decide whether a chemical combination is safe, compatible, stable, or suitable for a particular process.

When to use it

Use it when you need to reproduce a formula from parts, compare which ingredient dominates a blend, scale a proven mixture to a new batch size, or document a current formulation for colleagues. For hazardous products, always follow the manufacturer's instructions and safety data rather than improvising a ratio.

How to calculate

1. The calculator opens with a complete demonstration: 100 parts pineapple juice, 200 parts apple juice, 50 parts grenadine, and a 2× multiplier. The results and a validated Excel workbook are available immediately.
2. Choose the Shared unit. Then replace each component name and amount. All amounts must use that same unit.
3. Use Add component for up to 15 entries or the × button to remove one. Enter a positive Multiply every amount by value to scale the batch.
4. Read the total, percentages, chart, and component table. Choose Download Excel to export the current validated state.
5. Reset clears the demonstration data. Excel export stays disabled until you enter a complete valid mixture again.

Input guide

Shared unit is required and labels every amount; examples include parts, grams, milliliters, liters, cups, fluid ounces, or moles. Select the unit actually used for all entries. Mixing 100 g with 200 mL is not a valid same-unit ratio unless density is used in a separate conversion. NIST explains the distinction between SI mass units and SI volume units.

Each component name is required text, such as “Base resin” or “Hardener.” Each adjacent amount is a required positive decimal in the chosen unit, such as 2.5, 100, or 350. Commas, scientific notation, negative values, zero, and fractions written with a slash are rejected to prevent ambiguous interpretation. A larger amount increases that component's percentage and its scaled amount. Multiply every amount by is required, must be greater than zero, and may be below one for a smaller batch. It changes the total and scaled amounts but never the percentages.

Output guide

Scaled mixture total is the base total multiplied by the common factor. Base total is the sum of all original amounts. Multiplier repeats the scaling factor. In the table, Base amount is the entered quantity, Share is that quantity divided by the base total and expressed as a percentage, and Scaled amount is the base amount times the multiplier. The donut chart shows the same percentage shares as the table. A very small share means the component contributes little to the whole; percentages always total 100% apart from display rounding.

Worked example

For the startup mixture, the base total is 100 + 200 + 50 = 350 parts. Pineapple juice contributes 100 ÷ 350 × 100 = 28.57%, apple juice contributes 57.14%, and grenadine contributes 14.29%. Applying the 2× multiplier produces 200, 400, and 100 parts, for a scaled total of 700 parts. The percentage composition stays exactly the same because every component was multiplied by the same number. This is the same general “constituent divided by total” idea used in the IUPAC definition of amount fraction.