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Alligation Calculator

Chemistry
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Calculates the alligation ratios needed to mix two solutions of different concentrations to achieve a desired intermediate concentration.

More tools:Science & Lab Calculators
How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Concentration of Solution A, Concentration of Solution B, and Desired Concentration of Mixture in the units shown.

Step 2

Read Parts of Solution B, Parts of Solution A, Total Parts, Ratio of Solution B, and Ratio of Solution A in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Example 1

Concentration of Solution A: 70 %; Concentration of Solution B: 30 %; Desired Concentration of Mixture: 50 %

Parts of Solution B: 20; Parts of Solution A: 20; Total Parts: 40; Ratio of Solution B: 50 %; Ratio of Solution A: 50 %

Example 2

Concentration of Solution A: 90 %; Concentration of Solution B: 10 %; Desired Concentration of Mixture: 45 %

Parts of Solution B: 45; Parts of Solution A: 35; Total Parts: 80; Ratio of Solution B: 56.25 %; Ratio of Solution A: 43.75 %

Example 3

Concentration of Solution A: 60 %; Concentration of Solution B: 25 %; Desired Concentration of Mixture: 40 %

Parts of Solution B: 20; Parts of Solution A: 15; Total Parts: 35; Ratio of Solution B: 57.14 %; Ratio of Solution A: 42.86 %

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