Convert between hundreds of units — length, mass, volume, temperature, area, speed, time, digital data, and more with a single click. Everything runs locally in your browser — nothing is uploaded.
Convert time between different time zones. Enter a time and your source/target time zones and see the converted result. Everything runs locally in your browser — nothing is uploaded.
Convert between time units including seconds, minutes, hours, days, weeks, months, and years with precise decimal results. Everything runs locally in your browser — nothing is uploaded.
Measures your internet connection’s download speed and latency by downloading a test file from a CDN. Upload speed is not currently measured.
Speed up or slow down any video. Adjust playback speed from 0.1x to 10x with audio pitch preservation. Perfect for creating time-lapses, slow-motion replays, and quick reviews.
Calculate lean body mass from total weight and body fat percentage. Understand your muscle mass versus fat mass. Everything runs locally in your browser — nothing is uploaded.
Unit Converter lets you convert between hundreds of units — length, mass, volume, temperature, area, speed, time, digital data, and more with a single click. Everything runs locally in your browser — nothing is uploaded.. It works on any device with a modern web browser.
Convert between hundreds of units — length, mass, volume, temperature, area, speed, time, digital data, and more with a single click. Everything runs locally in your browser — nothing is uploaded. It runs entirely in your browser — no software installation or data uploads required.
Enter a numeric value to convert — all unit conversions update instantly.
Yes. After the initial page load, Unit Converter runs entirely on your device with no internet connection needed. All processing is done locally.
Length (mm, cm, m, km, in, ft, yd, mi) with more unit families available. Enter any value and see the conversion to all supported units instantly.
1 meter = 3.28084 feet. All conversions use internationally standardized factors.
1 inch = 2.54 cm exactly. This is a defined international agreement, not an approximation.
A marathon is 42.195 km (26.2 miles). The exact distance was standardized by the IAAF in 1921.
Length Converter
Convert length and distance between km, miles, meters, yards, feet, and inches. Simple and intuitive. Everything runs locally in your browser — nothing is uploaded.
Weight Converter
Convert weight between kg, g, lb, oz, and stone. Supports both metric and imperial systems. Everything runs locally in your browser — nothing is uploaded.
Volume Converter
Convert volume between liters, mL, gallons, quarts, fl oz, and cups. Handy for cooking, science, and travel. Everything runs locally in your browser — nothing is uploaded.