Convert between units of length, weight, temperature, volume, area, and speed. Fast, accurate, and free.
Fill in the fields above and click calculate. All calculations run instantly in your browser — no data is sent anywhere.
Length (mm to miles), Weight (mg to tons), Temperature (°C/°F/K), Volume (ml to gallons), Area (cm² to acres), and Speed (m/s to knots).
All conversions use standard SI base unit factors with 7 significant figures — suitable for science, engineering, and everyday use.
Temperature scales have different zero points, requiring formula conversions rather than simple multiplication.