Calculators · Free Tool
Unit Converter
Convert length, weight, temperature, data size, and speed between metric and imperial units.
About this tool
Convert values across five categories: length (mm to miles), weight (grams to pounds), temperature (Celsius, Fahrenheit, Kelvin), digital data (bytes to terabytes), and speed (km/h, mph, m/s, knots). Pick a category, choose the units, and the result updates as you type.
Conversions use exact standard factors — for example 1 inch = 2.54 cm and 1 pound = 453.59237 g — so results are precise enough for engineering use, not just estimates.
Common uses
- Convert a recipe or shipment weight between kg and lb
- Translate product dimensions between cm and inches for listings
- Check file-size limits across MB, MiB, and GB conventions
Frequently asked questions
Is a megabyte 1000 KB or 1024 KB?
Both conventions exist: decimal (1 MB = 1000 kB, used by storage vendors) and binary (1 MiB = 1024 KiB, used by operating systems). This tool uses the decimal convention with 1024-based values labeled explicitly.
Why does temperature convert differently from other units?
Temperature scales have different zero points, not just different step sizes — so converting requires an offset (°F = °C × 9/5 + 32), unlike simple multiplication for length or weight.
Is my data uploaded to a server?
No. This tool runs entirely in your browser using JavaScript — nothing you type is transmitted, logged, or stored anywhere. You can even use it offline once the page has loaded.