Solve the rule of three locally: from "A corresponds to B" you work out what belongs to C - plus value per unit, no upload.
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
The rule of three is probably the most used school calculation: if a quantity A corresponds to a value B, how much belongs to a quantity C? This calculator solves exactly that via the unitary method. First the value of a single unit of A is found, then it is multiplied by C. That lets you quickly convert prices, quantities, recipes or scales.
The calculation runs entirely locally in your browser, in pure JavaScript - nothing is uploaded and nothing is stored. The value per unit is B divided by A; the result is that value times C, that is B times C divided by A. Example: 3 kilograms cost 12, you want 5 kilograms - one unit costs 4, five cost 20. The results are plain numbers without a fixed unit; you decide what they mean. Change an input and everything updates instantly.
An honest note: this is the direct (proportional) rule of three - more of A means more of the result. The inverse rule of three, where more of A means less (for example more workers, less time), is not modelled by this calculator. For plain percentage questions use the percentage calculator. The results are unitless numbers.
| Input formats | Form inputs (no file) |
|---|---|
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: The direct (proportional) rule of three via the unitary method; the inverse rule of three (more A, less result) is not modelled. The results are unitless numbers whose meaning you set yourself. For plain percentage questions use the percentage calculator.
No. The calculation runs entirely locally in the browser (pure JavaScript); nothing is sent or stored.
Via the unitary method: value per unit = B divided by A, result = value per unit times C. In short: result = B times C divided by A.
No, this calculator solves the direct (proportional) rule of three. With the inverse rule more of A means less result - that is not modelled here.
In none fixed - the results are plain numbers. You decide whether they mean euros, kilograms, items or something else.