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Calculators

Proportion, meteors, free fall, lightning, discount, tips and electricity — with history, works offline.

Proportion

Find X from three known numbers

Optional — so you remember what it was for.

Enter the values and the result will appear here.

Formula

A : B = C : XX = C · BA

A relates to B the same way C relates to X.

A finished calculation is added to the history automatically.

History

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Nothing yet — finished calculations will appear here by themselves.

Calculations are stored on this device only and never sent anywhere. The page also opens without internet once you have visited it.