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Converters

Free online converters for units and colors: length, weight, temperature, volume and data units, plus HEX, RGB and HSL codes with a WCAG contrast check.

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Color ConverterColor converter for HEX, RGB, HSL and CSS syntax with a WCAG contrast checker.
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Unit ConverterUnit converter for length, weight, temperature, area, volume, speed and data.

About these converters

Converters for the values you look up most: length, weight, temperature, area, volume, speed and data units, plus HEX, RGB and HSL color codes with a live swatch. Pick a category and two units and the result updates instantly, with a table that shows the same value in every unit of that category.

The color converter also checks WCAG contrast against white and black, so you can tell at a glance whether a brand color is readable as text. Unit conversions use exact factors where the standard defines one (an inch is exactly 25.4 mm) and clearly labelled approximations elsewhere, and the FAQ on each page explains the traps, like US versus imperial gallons or KB versus KiB.