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Unit Converter

Convert between units of length, weight, temperature, volume, area, speed, time, power, energy, pressure, storage and data rate.

Length Converter

Professional grade conversion for length units.

Meter
Select Unit
0.001
Kilometer
Select Unit

Conversion Formula

1 Meter ≈ 0.001 Kilometer

What Unit Converter does

A single converter covering twelve measurement categories, using published conversion factors and, for temperature, the actual conversion formulas rather than a multiplier.

Each conversion goes through a base unit for the category, so any unit can be converted to any other unit within it.

  • Twelve categories with sixty-eight units in total
  • Swap the source and target units in one click
  • Show the conversion factor used for the current pair
  • Copy the unrounded result

How to use Unit Converter

  1. 1

    Pick a category

    Choose the kind of measurement you are converting.

  2. 2

    Enter the value and units

    Type the amount, then select what it is in and what you want it in.

  3. 3

    Read and copy the result

    The result updates as you type. Copy it to get the value without display formatting.

Limits and known behaviour

  • Digital storage uses binary units, so 1 KB is 1024 bytes. Storage manufacturers normally use 1000 bytes, which is why a advertised 500 GB drive shows less capacity in an operating system that counts in binary.
  • Month and year in the time category are averages of 30.44 and 365.24 days, not calendar durations. Do not use them for date arithmetic.
  • Arithmetic uses double-precision floating point, so results can carry a small representation error in the final digits.
  • Displayed digits are a formatting choice and do not indicate the precision of your input.
  • Fluid measures follow US customary definitions; UK imperial pints, gallons and fluid ounces are different sizes and are not offered separately.

Privacy and data handling

Runs entirely in your browser

  • Your input is processed by JavaScript running in this page. The tool sends no request anywhere, so nothing you paste is transmitted or logged by this site.
  • Nothing is saved between visits. Closing or reloading the tab discards whatever is in the fields.

Site-wide data handling, including analytics and advertising, is described in the privacy policy.

Frequently asked questions

Why does my gigabyte value not match my hard drive's label?

Two different conventions share the same abbreviation. This tool treats 1 GB as 1024 MB, the binary convention used by most operating systems; drive manufacturers use 1 GB as 1000 MB. The gap is about 7% at gigabyte scale and grows with size.

Why is the last digit slightly off?

Binary floating point cannot represent every decimal fraction exactly, so a conversion can end in a tiny residue. It is a property of the arithmetic, not of the conversion factor.

Are US and UK gallons the same?

No. A US gallon is about 3.785 litres and an imperial gallon about 4.546 litres. The volumes here are US customary.