Unit Converter
Convert between units for length, weight, temperature, volume, and time. Enter a value and switch units instantly — no button press required.
Category
Popular conversions:
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.
Frequently Asked Questions
How precise are the conversion calculations?
Conversions are computed using high-precision double-precision floating math with up to 10 significant figures, formatted to strip trailing floating-point rounding artifacts.
Can I convert negative values like below-zero temperatures?
Yes — negative numbers are fully supported for temperature scales (Celsius and Fahrenheit) where sub-zero measurements frequently occur.
Are liquid measurements in US Customary or Imperial units?
Volume units (such as cups, pints, fluid ounces, and gallons) follow the standard US Customary measurement definitions.
Is any conversion data transmitted to external servers?
No — all unit conversions calculate instantaneously inside your web browser. No measurements or inputs are ever sent to a server.