Length Converter



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The base unit for measuring length in the International System of Units is meter [m]. The current valid definition of meter is:
The meter is currently defined as the length of the path travelled by light in a vacuum in \(\frac{1}{299792458}\) of a second.
Since 1795 there were numerous definition of the meter. In following table the defintions of meter from 1795 to the current defintion from 1983 are given.

Basis of definition Date Absolute uncertainty Relative uncertainty
\(\frac{1}{10000000}\) part of the quadrant along the meridian, measuremnt, by Delambre and Mechain (443.296 lines)
1795
100-500 [µm]
\(10^{-4}\)
First prototype Metre des Archives platinum bar standard
1799
10-50 [µm]
\(10^{-5}\)
Platinum-iridium bar at melting point of ice (1st General Conference on Weights and Measures (CGPM))
1889
0.1-0.2 [µm] (100-200 [nm])
\(10^{-7}\)
Platinum-iridium bar at melting point of ice, atmosperic pressure, supported by two rollers (7th CGPM)
1927
n.a.
n.a.
Hyperfine atomic transition; 1650763.73 wavelengths of light from a specified transition in krypton-86 (11th CGPM)
1960
4 [nm]
\(4 \times 10^{-9}\)
Length of the path travelled by light in a vacuum in \(\frac{1}{299792458}\) second (17th CGPM)
1983
0.1 [nm]
\(10^{-10}\)

The conversion of all units to meters (base measurement unit) that are listed in the length unit converter above is shown below.
1 yottameter [Ym] = \(1.0\times10^{24}\) meter [m]
1 ztettameter [Zm] = \(1.0\times10^{21}\) meter [m]
1 exameter [Em] = \(1.0 \times 10^{18}\) meter [m]
1 parsec [pc] = \(3.08567758 \times 10^{16}\) meter [m]
1 light-year [ly] = \(9.4605284 \times 10^{15}\) meter [m]
1 petameter [Pm] = \(1.0\times 10^{15}\) meter [m]
1 light-day = \(2.59020683712\times10^{13}\) meter [m]
1 light-hour = \(1.079252848800\times10^{12}\)meter [m]
1 terameter [Tm] = \(1.0\times10^{12}\) meter [m]
1 spat = \(1.0\times10^{12}\)
1 astronomical unit [au] = \(1.495978707\times10^{11}\)meter [m]
1 light-minute = \(1.7987547480\times10^{10}\)meter [m]
1 gigameter [Gm] = \(1.0\times10^{9}\)meter [m]
1 light-second = \(2.99792500\times10^{8}\)meter [m]
1 megameter [Mm] = \(1.0\times10^{6}\)
1 mil (Sweeden or Norway) [mil] = 10000 meter [m]
1 nautical league [Nl; nl] = 5556 meter [m]
1 league (land) [lea] = 4828 meter [m]
1 mile (telegraph) = 1855.3176 meter [m]
1 mile (geographical) = 1853.7936 meter [m]
1 nautical mile (US pre 1954) = 1853.248 meter [m]
1 nautical mile (Admiralty) [NL (Adm)] = 1853.184 meter [m]
1 nautical mile (international) [NM, nmi] = 1852 meter [m]
1 mile (tactical or data) = 1828.8 meter [m]
1 mile (US survey) [mi] = 1609.347219 meter [m]
1 mile (international) [mi] = 1609.344 meter [m]
1 kilometer [km] = 1000 meter [m]
1 furlong [fur] = 201.168 meter [m]
1 calbe length (US) = 219.456 meter [m]
1 calbe length (imperial) = 185.3184 meter [m]
1 cable length (international) = 185.2 meter [m]
1 hectometer [hm] = 100 meter [m]
1 chain [ch] = 20.11584 meter [m]
1 decameter [dam] = 10 meter [m]
1 rope [rope] = 6.096 meter [m]
1 rod; pole; perch [rd] = 5.0292 meter [m]
1 toise (French, post 1667) [T] = 1.9490363meter [m]
1 fathom [ftm] = 1.8288 meter [m]
1 ell [ell] = 1.143 meter [m]
1 meter [m] = 1 meter [m]
1 yard (International) [yd] = 0.9144 meter [m]
1 pace = 0.762 meter [m]
1 cubit (H) = 0.4572 meter [m]
1 link (ramsden's; Engineer's) [lnk] = 0.3048 meter [m]
1 shaku (Japan) = 0.303 meter [m]
1 foot (Cape) = 0.314858 meter [m]
1 foot (Benoit) [ft (Ben)] = 0.304799735 meter [m]
1 foot (Clarke's) [ft (Cla)] = 0.3047972654 meter [m]
1 foot (Indian) [ft Ind] = 0.304799514 meter [m]
1 foot, metric [mf] = 0.3 meter [m]
1 foot (International) [ft] = 0.3048 meter [m]
1 foot (Sear's) [fr (Sear)] = 0.30479947 meter [m]
1 foot (US Survey) [ft (US)] = 0.30480061 meter [m]
1 span = 0.2286 meter [m]
1 quarter = 0.2286 meter [m]
1 link (Gunter's; Surveyor's) [lnk] = 0.2011684 meter [m]
1 finger (cloth) = 0.1143 meter [m]
1 hand = 0.1016 meter [m]
1 decimeter [dm] = 0.1 meter [m]
1 palm = 0.0762 meter [m]
1 nail (cloth) = 0.05715 meter [m]
1 stick = 0.0508 meter [m]
1 inch (International) [in] = 0.0254 meter [m]
1 finger = 0.022225 meter [m]
1 centimeter [cm] = 0.01 meter [m]
1 pica = 0.0042333333 meter [m]
1 french charriere [F] = 0.003 meter [m]
1 line [ln] = 0.002116 meter [m]
1 milimeter [mm] = 0.001 meter [m]
1 point (Didot; European) [pt] = 0.00037593985 meter [m]
1 point (PostScript) [pt] = 0.000352778 meter [m]
1 point (American, English) [pt] = 0.00035145 meter [m]
1 point (TeX) [pt] = 0.0003514598035 meter [m]
1 mickey = 0.000127 meter [m]
1 mil; thou [mil] = 0.0000254 meter [m]
1 twip [twp] = 0.0000176389 meter [m]
1 micrometer [µm] = 0.000001 meter [m]
1 nanometer [nm] = \(1.0\times10^{-9}\)meter [m]
1 Ångstrom [Å] = \(1.0\times10^{-10}\) meter [m]
1 Bohr, atomic unit of length [a\(_0\)] = \(5.29177249\times 10^{-11}\) meter [m]
1 picometer [pm] = \(1.0\times10^{-12}\)meter [m]
1 x unit; siegbahn [xu] = \(1.0021\times10^{-13}\) meter [m]
1 femtometer [fm] = \(1.0 \times 10^{-15}\) meter [m]
1 attometer [am] = \(1.0\times10^{-18}\)meter [m]
1 zeptometer [zm] = \(1.0\times10^{-21}\)meter [m]
1 yoctometer [ym] = \(1.0\times10^{-24}\)meter [m]

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