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Unit converter
Length, weight, temperature, and more — fast and free
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Works offline
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All categories
Length
Convert between metric and imperial length units instantly
8 units
Weight
Convert between kilograms, pounds, ounces, and more
6 units
Temperature
Convert between Celsius, Fahrenheit, and Kelvin
3 units
Time
Convert between seconds, minutes, hours, days, and more
8 units
Volume
Convert between liters, gallons, cups, and more
7 units
Speed
Convert between km/h, mph, m/s, and knots
4 units
Area
Convert between square meters, square feet, acres, and more
10 units
Data
Convert between bytes, kilobytes, megabytes, gigabytes, and more
6 units
Frequently asked questions
How accurate are these conversions?
All conversions use precise conversion factors (up to 10 significant digits). Results are accurate for everyday use and most professional applications.
Does the unit converter work offline?
Yes. All calculations run in your browser with no server calls. Once the page loads, it works without an internet connection.
What unit categories are supported?
Length, weight, temperature, time, volume, speed, area, and data storage. Each category includes both metric and imperial units where applicable.
Is my data sent to a server?
No. Every conversion happens locally in your browser. Nothing is uploaded or stored on any server.