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Numio

Rule of Three Calculator (Dreisatz with Steps)

Solve direct and inverse proportion problems with the rule of three, showing each calculation step. Runs in your browser.

Mode

Input

Result

Type or paste on the left — the result updates as you type.

Solves a rule-of-three problem and shows the calculation step by step.

Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.

Format references

Tool page updated: