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60+ Units — Standard, Metric, Nautical, Historical, Astronomical, Light Years & Scientific
Instantly convert length and distance across Standard, Metric, Nautical, Historical, Astronomical, Light Year, and Scientific/Micro units. Live calculation, adjustable decimal precision, formula breakdown, and print-ready output. All calculations happen in your browser — your data never leaves your device.
Conversion factors sourced from NIST and SI standard definitions. Results are mathematically exact within floating-point precision.
This converter supports over 60 length and distance units across seven groups: Standard (US/Imperial), Metric, Nautical, Historical, Astronomical, Light Years, and Scientific/Micro units. Some units, such as fathom and several US survey variants, intentionally appear in more than one group because they are genuinely used in both contexts — for example, fathom appears in both Nautical and Historical.
A statute mile equals 1609.344 meters and is used for land distances in the United States. A nautical mile equals 1852 meters under the international standard (or 1853.184 meters under the older UK definition) and is used for sea and air navigation, based on one minute of arc along the Earth's surface.
A furlong equals 201.168 meters, or exactly one-eighth of a mile. It is a historical English unit still used today primarily in horse racing to measure race distances.
A light year is the distance light travels in one year in a vacuum — approximately 9.461 × 10¹⁵ meters, or about 5.879 trillion miles. It is used by astronomers to measure distances between stars and galaxies, since meters and even kilometers become impractical at that scale.
An angstrom equals 1.0 × 10⁻¹⁰ meters, or one ten-billionth of a meter. It is commonly used in chemistry, crystallography, and physics to measure atomic radii, chemical bond lengths, and the wavelength of visible light.
An Astronomical Unit (AU) equals about 1.496 × 10¹¹ meters — the average distance from Earth to the Sun — and is used for distances within our solar system. A parsec equals about 3.086 × 10¹⁶ meters, roughly 206,265 times larger than an AU, and is used for distances between stars and galaxies.
Yes. All calculations happen entirely in your browser. No values you enter are ever transmitted to a server.