How to use this unit converter
This unit converter supports eight measurement categories covering the most common conversions people need daily. Select a category tab, enter a numeric value, choose the "from" and "to" units, and the result updates in real time. The conversion formula is displayed beneath the result so you can verify or learn the math.
Supported categories
Length (mm to miles), Weight (mg to tonnes), Temperature (°C, °F, K), Speed (m/s, km/h, mph, knots), Area (mm² to km², acres, hectares), Volume (ml to gallons), Data (bits to terabytes), and Time (ms to years). All conversions run locally — no data leaves your device.
Tips
Use the swap button (⇄) to quickly reverse the conversion direction. Temperature conversions use the standard formulas (not simple multiplication), so Celsius ↔ Fahrenheit ↔ Kelvin are all handled correctly.