Unit Converter
Convert between units for length, weight, temperature, volume, and time. Enter a value and switch units instantly — no button press required.
Category
Calculated locally in your browser.
How to use
- Select a category — Length, Weight / Mass, Temperature, Volume, or Time.
- Choose units — select the “From” and “To” units from the dropdowns. Use the ⇄ button to swap them.
- Enter a value — the result updates instantly.
Conversion examples
- Length: 10 kilometers = 6.21371 miles
- Weight: 1 kilogram = 2.20462 pounds
- Temperature: 100°C = 212°F = 373.15 K
- Volume: 1 liter = 33.814 US fluid ounces
- Time: 1 day = 86,400 seconds
Supported categories
- Length — mm, cm, m, km, inch, foot, yard, mile
- Weight / Mass — mg, g, kg, ounce, pound, stone
- Temperature — Celsius, Fahrenheit, Kelvin
- Volume — ml, liter, US fluid oz, US cup, US pint, US gallon
- Time — millisecond, second, minute, hour, day, week
Temperature note
Temperature conversions use the correct formulas — not simple multiplication factors. Celsius ↔ Fahrenheit ↔ Kelvin are all handled precisely.
FAQ
- How precise are the results? Results are displayed with up to 10 significant figures and are formatted to avoid floating-point noise.
- Can I enter negative values? Yes — negative values are valid for some units (e.g. negative Celsius temperatures).
- Are US or imperial units used? Volume units are US customary (US cup, US gallon, etc.).
- Is my data sent anywhere? No — all conversions happen locally in your browser.