Unit Converter

Convert between metric and imperial units. Length, weight, temperature, area, volume, speed. Free, instant.

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About Unit Converter

Convert between hundreds of units across 6 categories. Length, weight, temperature, area, volume, and speed. Real-time conversion as you type. All calculations in your browser — no data sent anywhere.

6 Categories

Length (miles to km), weight (lbs to kg), temperature (°F to °C), area, volume, speed. All common conversions.

100+ Units

Metric, imperial, and specialized units. From nanometers to miles, milligrams to tons — everything covered.

Real-Time Results

Convert as you type. No submit button needed. See results update instantly with every keystroke.

Works Offline

Pure JavaScript calculations. No API calls, no internet needed after page load. Reliable anywhere.