Toolivaro

Free Math Calculators & Converters

Everyday math rarely needs a spreadsheet. These calculators handle the arithmetic and unit conversions that come up constantly — percentages of anything, percentage change, and exact conversions between metric and imperial units — with every formula shown and every result computed locally in your browser. Nothing is sent to a server or logged.

Popular tools

Percentage Calculator Stable Four percentage calculations in one tool: X% of Y, X is what % of Y, % change from X to Y, and Y plus or minus X%.
Unit Converter Stable Convert length, weight, temperature, volume, and speed between metric and imperial units with exact conversion factors.

About this category

Math Calculators & Converters on Toolivaro follow the same standard as every other page on the site: each tool shows its formula or method, its assumptions, a worked example, and its limitations, and every result is computed locally in your browser.

All tools are reviewed on a regular schedule. If a calculation looks wrong to you, use the correction link at the bottom of the tool page — corrections are reviewed by a human and the reviewed date is updated when changes land.

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