Everyday Calculation

Free calculators and unit converters for general and everyday use.

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Ratio Calculator


Our online tools will provide quick answers to your calculation and conversion needs. On this page, you can calculate missing value in a proportion and/ or test if two ratios are equivalent.

a : b = c : d

: = :

To find the missing element, leave it blank. To check for equivalent ratios, fill up all four fields.

Result window

Proportion calculation

Given two equivalent ratios, you can solve for the missing value using cross multiplication to convert the proportion into a equation and then solve for the variable.

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