Unit Converter
Convert between units of length, mass, temperature, area, volume, speed, time and digital storage. Everything runs in your browser — your data is never sent anywhere and nothing is stored.
How to use the unit converter
- Pick a category such as Length, Mass, Temperature or Digital Storage.
- Type the value you want to convert and choose the from and to units.
- Read the result instantly, use swap to reverse the direction, and copy when you are done.
Common conversions: 1 km = 0.621371 mi, 1 kg = 2.20462 lb,
0 C = 32 F = 273.15 K, and 1 GB = 1000 MB while 1 GiB = 1024 MiB.
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Frequently asked questions
What can this unit converter do?
It converts values across eight categories: Length, Mass / Weight, Temperature, Area, Volume, Speed, Time and Digital Storage. Pick a category, type a value, choose the units to convert from and to, and the result updates instantly.
Is my data sent anywhere?
No. Every conversion runs entirely in your browser using plain JavaScript — nothing is uploaded to a server and nothing is stored. You can even use it offline once the page has loaded.
How accurate are the conversions?
Conversions use exact or standard conversion factors relative to a base unit (for example the metre for length, the kilogram for mass). Results are rounded to a sensible number of significant figures for display, but the underlying maths uses full double precision.
How does temperature conversion work?
Temperature is handled specially because the scales do not share a zero point. Celsius, Fahrenheit and Kelvin are converted with their proper formulas — for example F = C × 9/5 + 32 and K = C + 273.15 — rather than a simple ratio.
What is the difference between KB and KiB?
Under digital storage, KB, MB, GB, TB are decimal units (powers of 1000), while KiB, MiB, GiB are binary units (powers of 1024). A megabyte is 1,000,000 bytes, but a mebibyte is 1,048,576 bytes.
What does the swap button do?
The swap button instantly flips the from and to units so you can reverse the conversion without re-selecting them — handy for checking a value in both directions.