オンライン無料単位変換
Instantly convert between length, weight, temperature, data storage, speed, time, and area units.
How It Works
Select a category, choose your "from" and "to" units, and type a value in either field. The conversion happens instantly in both directions. All calculations run locally in your browser.
Supported Categories
- Length · millimeters, centimeters, meters, kilometers, inches, feet, yards, miles
- Weight · milligrams, grams, kilograms, ounces, pounds, tons
- Temperature · Celsius, Fahrenheit, Kelvin
- Digital Storage · bytes, KB, MB, GB, TB, PB
- Speed · m/s, km/h, mph, knots
- Time · seconds, minutes, hours, days, weeks, months, years
- Area · sq meters, sq feet, acres, hectares, sq km, sq miles
Frequently Asked Questions
How accurate are the conversions?
All conversions use standard mathematical formulas with JavaScript floating-point precision (about 15-17 significant digits). This is accurate enough for everyday use, engineering estimates, and homework.
Can I convert in both directions?
Yes. Type in either field and the other updates instantly. The conversion is always bidirectional and real-time.
Do you support currency conversion?
Not currently. Currency exchange rates change constantly and require live data from an API. Since our tools run offline and client-side, we focus on fixed-rate unit conversions that never go stale.