Unit Converter
Convert length, weight, temperature, area, volume and more online. 40 units across length, weight, temperature, area, volume, time and speed — type a value and get the result instantly.
How to use
- Pick a category first: length, weight, temperature, area, volume, time or speed.
- Choose the "From" unit on the left and the "To" unit on the right, then type the value you want to convert.
- The result updates as you type. Click "⇄ Swap" to flip the two units, or "Clear" to reset the input.
FAQ
Are the conversions accurate?
Yes — this tool uses internationally accepted conversion factors (e.g. 1 inch = 2.54 cm, 1 pound = 0.45359237 kg), and temperature uses the standard formulas between Celsius, Fahrenheit and Kelvin. Results are rounded to at most 10 significant digits so floating-point noise never shows up.
How are "month" and "year" defined?
"Year" is treated as an average of 365.25 days (the Julian year), and "month" is one twelfth of it, about 30.44 days — ideal for rough calendar conversions. For billing or scheduling precision, always refer to the actual calendar.
Which units are supported?
Length: m, cm, mm, km, in, ft, yd, mile; weight: kg, g, mg, t, lb, oz; area: m², km², cm², ha, acre, ft²; volume: L, mL, m³, cm³, gal (US), gal (UK); time: s, min, h, day, week, month, year; speed: m/s, km/h, mph, knot; temperature: °C, °F, K.