Unit Converter

中

Loading...

Unit Converter — Length, Weight, Temperature, Area, Volume, Speed

Convert between metric and imperial units across six categories: length (mm to miles), weight (mg to tons, including 斤), temperature (°C/°F/K), area (including 亩 and acres), volume (including US cups and gallons), and speed (km/h, mph, knots).

Every category uses exact official conversion factors, and China-specific units (斤, 亩) sit alongside their Western equivalents — handy for cooking, real estate, logistics, and schoolwork. Everything converts locally, instantly, as you type.

How to convert units

  1. Pick a category: length, weight, temperature, area, volume, or speed.
  2. Enter the value to convert.
  3. Choose the source and target units from the dropdowns.
  4. Read the result immediately — switch units freely to compare.

Frequently asked questions

Are the conversion factors exact?

Yes — factors are the internationally defined values (1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Temperature uses the exact Celsius/Fahrenheit/Kelvin formulas.

What are 斤 and 亩?

Traditional Chinese units still widely used in daily life: 1 斤 = 500 g for weight, 1 亩 ≈ 666.67 m² for land area. The converter maps them exactly to metric.

Why does temperature convert differently from other units?

Temperature scales have offsets (0°C is not "zero amount of temperature"), so they convert by formula rather than multiplication. The tool handles this automatically — just do not treat °F conversions like a simple factor.

Related tools

Date Calculator
Days between two dates, or add/subtract days from a date
Percentage Calculator
Percentage increase, decrease, of a number, and difference calculators
Base Converter
Convert between binary, octal, decimal, hexadecimal, and ASCII

PureKit · unit-converter · Free online tool — files processed locally in your browser, no upload.