Alligation Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

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A small unit or concentration mistake can move a solution calculation by orders of magnitude. Alligation Calculator keeps the relevant quantities visible and applies the configured equation on a consistent basis.

What this calculator does

The Alligation Calculator uses Higher concentration, Lower concentration, Required concentration, Higher concentration volume, and Lower concentration volume. With the bundled default scenario, the primary result is shown as “Alligation ratio (higher : lower)” and the displayed value is 20 : 20. Supporting outputs include Higher volume, Lower volume, Required volume. The answer is tied to the exact fields and calculation branch exposed on this page; it does not invent missing sample composition, laboratory conditions, or reference data.

How to use it

Use the calculator from left to right: select the chemical mode, element, or method where applicable, then enter Higher concentration, Lower concentration, Required concentration, Higher concentration volume, and Lower concentration volume. When comparing scenarios, change one variable at a time so you can see which assumption actually moves the result.

How the calculation works

The page’s calculation model is: Calculates how much of two concentrations to mix to obtain a target concentration. It uses only the inputs exposed by the calculator and does not silently infer missing composition, purity, mechanism, or laboratory conditions.

Worked example

For a reproducible worked check, enter Higher concentration = 50; Lower concentration = 10; Required concentration = 30; Required concentration volume = 100 mL. The calculator returns 20 : 20 for “Alligation ratio (higher : lower)”. The same run reports Higher volume = 0.05 L; Lower volume = 0.05 L. This default case is useful for confirming that the expected units, selectors, formula, and sign convention are active before you replace the values with your own data.

How to interpret the result

For Alligation Calculator, the primary output should be read in context. Interpret the result within the stated concentration and acid–base model. Real solutions can depart from ideal behavior at high ionic strength or concentration, and measured pH can also depend on temperature and instrument calibration. If the result looks surprising, recheck units, prefixes, signs, chemical formula or species selection, and whether every value belongs to the same sample or condition.

Limitations and practical notes

For Alligation Calculator, keep this limitation in mind: Most compact solution calculators use idealized relationships. Activity effects, mixed buffers, polyprotic systems, temperature-dependent constants, or density corrections may require a more detailed model.

For repeated use, record the inputs beside the Alligation Calculator result. That matters in laboratory and coursework settings because the final number alone does not show which concentration basis, temperature, species, or assumptions produced it.