Unit converter
Convert between units with exact factors — instantly, on your device.
Convert a value from one unit to another across eight categories: length, mass, temperature, area, volume, speed, time and digital storage. Conversions use exact ratios, and temperature is handled correctly as an affine scale, so 0 °C becomes exactly 32 °F. Everything runs in your browser — nothing is sent anywhere.
How it works
- Pick a category.
- Type the value.
- Choose the units to convert from and to.
- Read the result — it updates as you type.
Example uses
- Converting kilometres to miles for a trip.
- Turning a recipe from cups to millilitres.
- Checking a temperature in °C and °F.
Frequently asked questions
Are the conversion factors exact?
Yes, they use the standard definitions (for example 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg). Temperature uses the correct affine formulas, not an approximation.
What is the difference between MB and MiB?
MB is decimal (1,000,000 bytes); MiB is binary (1,048,576 bytes). Both are offered so you can match whichever your device reports.
Your files stay on your device
This tool runs entirely in your browser. After the page has loaded, nothing about your document is sent to a server — no upload, no account, no watermark.
By selecting files, you confirm you may process them and accept the Terms of Use.