length Quantity (Library of Units and Constants

Name:
angstrom
(convert angstrom to new units)

Abbreviation:
A

Other Names:
Ang, tenthmeter, tenthmetre

Metric (SI) Equivalent:
100 pico meters

Metric (SI) Dimensions:
length

Note:
The metric (SI) equivalent above is exact.

Name:
Angstrom-star
(convert Angstrom-star to new units)

Abbreviation:
A-star

Metric (SI) Equivalent:
100.001509 pico meters

Standard Uncertainty:
90 atto meters

Metric (SI) Dimensions:
length

Note:
The value for this measured constant was obtained from NIST. See their section on constants, units, and uncertainty for more information.

Name:
arpent-length
(convert arpent-length to new units)

Metric (SI) Equivalent:
58.471308 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
180 feet-French-measure

Notes:
(1) Quebec survey unit
(2) The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
astronomical-unit
(convert astronomical-unit to new units)

Abbreviation:
AU

Another Name:
UA

Metric (SI) Equivalent:
1.495979e+8 kilo meters

Metric (SI) Dimensions:
length

Name:
barleycorn
(convert barleycorn to new units)

Metric (SI) Equivalent:
8.4666666667 milli meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
inch / 3

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
baromil
(convert baromil to new units)

Another Name:
barometer-mil

Metric (SI) Equivalent:
750.0616827 micro meters

Metric (SI) Dimensions:
length

Name:
Bohr-radius
(convert Bohr-radius to new units)

Abbreviation:
a-0

Other Names:
Rb, atomic-unit-of-length, bohr, first-Bohr-radius

Metric (SI) Equivalent:
52.91772108 pico meters

Standard Uncertainty:
180 zepto meters

Metric (SI) Dimensions:
length

Note:
The value for this measured constant was obtained from NIST. See their section on constants, units, and uncertainty for more information.

Name:
bolt
(convert bolt to new units)

Metric (SI) Equivalent:
36.576 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
40 yards

Notes:
(1) This unit is used for measuring cloth.
(2) The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
cable-length
(convert cable-length to new units)

Belongs to:
cable-length Group

Metric (SI) Equivalent:
219.456 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
120 fathoms

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
cable-length-non-US-UK
(convert cable-length-non-US-UK to new units)

Belongs to:
cable-length Group

Metric (SI) Equivalent:
185.2 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
nautical-mile / 10

Notes:
(1) The "non-US-UK" suffix indicates that this unit is used outside the United States and the United Kingdom
(2) The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
cable-length-UK
(convert cable-length-UK to new units)

Belongs to:
cable-length Group

Metric (SI) Equivalent:
185.3 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
nautical-mile-UK / 10

Notes:
(1) The "UK" suffix indicates that this unit is used in the United Kingdom.
(2) The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
cable-length-US-survey
(convert cable-length-US-survey to new units)

Another Name:
survey-cable-length

Belongs to:
cable-length Group

Metric (SI) Equivalent:
219.45643891 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
120 fathoms-US-survey

Notes:
(1) The "US-survey" suffix indicates that this unit is used in the United States for some survey measurements.
(2) The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
caliber
(convert caliber to new units)

Another Name:
calibre

Metric (SI) Equivalent:
254 micro meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
inch / 100

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
chain
(convert chain to new units)

Abbreviation:
ch

Another Name:
international-chain

Belongs to:
chain Group

Metric (SI) Equivalent:
20.1168 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
100 links

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
chain-engineer
(convert chain-engineer to new units)

Abbreviation:
ch-eng

Another Name:
chain-ramsden

Belongs to:
chain Group

Metric (SI) Equivalent:
30.48 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
100 links-engineer

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
chain-US-survey
(convert chain-US-survey to new units)

Abbreviation:
ch-US-survey

Other Names:
survey-chain, chain-surveyor, chain-gunter

Belongs to:
chain Group

Metric (SI) Equivalent:
20.116840234 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
100 links-US-survey

Notes:
(1) The "US-survey" suffix indicates that this unit is used in the United States for some survey measurements.
(2) The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
classical-electron-radius
(convert classical-electron-radius to new units)

Abbreviation:
r-e

Metric (SI) Equivalent:
2.817940325 femto meters

Standard Uncertainty:
28 yocto meters

Metric (SI) Dimensions:
length

Note:
The value for this measured constant was obtained from NIST. See their section on constants, units, and uncertainty for more information.

Name:
click
(convert click to new units)

Metric (SI) Equivalent:
1 kilo meter

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
1000 meters

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
Compton-wavelength
(convert Compton-wavelength to new units)

Abbreviation:
lambda-C

Metric (SI) Equivalent:
2.426310238 pico meters

Standard Uncertainty:
16 zepto meters

Metric (SI) Dimensions:
length

Note:
The value for this measured constant was obtained from NIST. See their section on constants, units, and uncertainty for more information.

Name:
cubit
(convert cubit to new units)

Metric (SI) Equivalent:
0.4572 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
18 inches

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
ell
(convert ell to new units)

Metric (SI) Equivalent:
1.143 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
45 inches

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
fathom
(convert fathom to new units)

Abbreviation:
fath

Another Name:
international-fathom

Belongs to:
fathom Group

Metric (SI) Equivalent:
1.8288 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
2 yards

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
fathom-US-survey
(convert fathom-US-survey to new units)

Abbreviation:
fath-US-survey

Another Name:
survey-fathom

Belongs to:
fathom Group

Metric (SI) Equivalent:
1.8288036576 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
2 yards-US-survey

Notes:
(1) The "US-survey" suffix indicates that this unit is used in the United States for some survey measurements.
(2) The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
fermi
(convert fermi to new units)

Metric (SI) Equivalent:
1 femto meter

Metric (SI) Dimensions:
length

Note:
The metric (SI) equivalent above is exact.

Name:
foot
(convert foot to new units)

Abbreviation:
ft

Other Names:
feet, ', international-foot

Belongs to:
foot Group

Metric (SI) Equivalent:
0.3048 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
12 inches

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
foot-French-measure
(convert foot-French-measure to new units)

Abbreviation:
ft-French-measure

Other Names:
foot-Paris, Paris-foot, pied

Belongs to:
foot Group

Metric (SI) Equivalent:
0.3248406 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
12.789 inches

Notes:
(1) Quebec survey unit
(2) The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
foot-US-survey
(convert foot-US-survey to new units)

Abbreviation:
ft-US-survey

Another Name:
survey-foot

Belongs to:
foot Group

Metric (SI) Equivalent:
0.3048006096 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
(1200 / 3937) meters

Notes:
(1) The "US-survey" suffix indicates that this unit is used in the United States for some survey measurements.
(2) The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
furlong
(convert furlong to new units)

Abbreviation:
fur

Another Name:
international-furlong

Belongs to:
furlong Group

Metric (SI) Equivalent:
201.168 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
660 feet

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
furlong-US-survey
(convert furlong-US-survey to new units)

Abbreviation:
fur-US-survey

Another Name:
survey-furlong

Belongs to:
furlong Group

Metric (SI) Equivalent:
201.16840234 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
660 feet-US-survey

Notes:
(1) The "US-survey" suffix indicates that this unit is used in the United States for some survey measurements.
(2) The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
hand
(convert hand to new units)

Abbreviation:
hd

Metric (SI) Equivalent:
0.1016 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
4 inches

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
inch
(convert inch to new units)

Abbreviation:
in

Other Names:
", international-inch

Belongs to:
inch Group

Metric (SI) Equivalent:
2.54 centi meters

Metric (SI) Dimensions:
length

Note:
The metric (SI) equivalent above is exact.

Name:
inch-US-survey
(convert inch-US-survey to new units)

Abbreviation:
in-US-survey

Another Name:
survey-inch

Belongs to:
inch Group

Metric (SI) Equivalent:
2.54000508 centi meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
foot-US-survey / 12

Notes:
(1) The "US-survey" suffix indicates that this unit is used in the United States for some survey measurements.
(2) The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
lattice-parameter-of-silicon
(convert lattice-parameter-of-silicon to new units)

Metric (SI) Equivalent:
543.102122 pico meters

Standard Uncertainty:
20 atto meters

Metric (SI) Dimensions:
length

Note:
The value for this measured constant was obtained from NIST. See their section on constants, units, and uncertainty for more information.

Name:
lattice-spacing-of-silicon
(convert lattice-spacing-of-silicon to new units)

Abbreviation:
d-220

Metric (SI) Equivalent:
192.0155965 pico meters

Standard Uncertainty:
7 atto meters

Metric (SI) Dimensions:
length

Note:
The value for this measured constant was obtained from NIST. See their section on constants, units, and uncertainty for more information.

Name:
league
(convert league to new units)

Abbreviation:
leag

Other Names:
international-league, land-league

Belongs to:
league Group

Metric (SI) Equivalent:
4.828032 kilo meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
3 miles

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
league-US-survey
(convert league-US-survey to new units)

Abbreviation:
leag-US-survey

Other Names:
survey-league, statute-league

Belongs to:
league Group

Metric (SI) Equivalent:
4.8280416561 kilo meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
3 miles-US-survey

Notes:
(1) The "US-survey" suffix indicates that this unit is used in the United States for some survey measurements.
(2) The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
light-year
(convert light-year to new units)

Abbreviation:
ly

Other Names:
lyr, ltyr

Metric (SI) Equivalent:
9.4607304726e+12 kilo meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
speed-of-light-in-vacuum year

Name:
line-length
(convert line-length to new units)

Other Names:
line, button

Metric (SI) Equivalent:
2.1166666667 milli meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
inch / 12

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
link
(convert link to new units)

Abbreviation:
li

Other Names:
lk, international-link

Belongs to:
link Group

Metric (SI) Equivalent:
0.201168 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
0.66 feet

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
link-engineer
(convert link-engineer to new units)

Abbreviation:
li-eng

Other Names:
lk-eng, link-ramsden

Belongs to:
link Group

Metric (SI) Equivalent:
0.3048 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
foot

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
link-US-survey
(convert link-US-survey to new units)

Abbreviation:
li-US-survey

Other Names:
lk-US-survey, survey-link, link-surveyor, link-gunter

Belongs to:
link Group

Metric (SI) Equivalent:
0.20116840234 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
0.66 feet-US-survey

Notes:
(1) The "US-survey" suffix indicates that this unit is used in the United States for some survey measurements.
(2) The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
meter
(convert meter to new units)

Abbreviation:
m

Another Name:
metre

Metric (SI) Equivalent:
meter is a metric unit (in fact, it is a base SI unit)

Metric (SI) Dimensions:
length

Name:
micron
(convert micron to new units)

Abbreviation:
mu

Metric (SI) Equivalent:
1 micro meter

Metric (SI) Dimensions:
length

Note:
The metric (SI) equivalent above is exact.

Name:
mile
(convert mile to new units)

Abbreviation:
mi

Other Names:
international-mile, land-mile

Belongs to:
mile Group

Metric (SI) Equivalent:
1.609344 kilo meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
5280 feet

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
mile-US-survey
(convert mile-US-survey to new units)

Abbreviation:
mi-US-survey

Other Names:
survey-mile, statute-mile

Belongs to:
mile Group

Metric (SI) Equivalent:
1.6093472187 kilo meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
5280 feet-US-survey

Notes:
(1) The "US-survey" suffix indicates that this unit is used in the United States for some survey measurements.
(2) The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
mil-length
(convert mil-length to new units)

Other Names:
thou, mil

Metric (SI) Equivalent:
25.4 micro meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
inch / 1000

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
muon-Compton-wavelength
(convert muon-Compton-wavelength to new units)

Abbreviation:
lambda-C-mu

Metric (SI) Equivalent:
11.73444105 femto meters

Standard Uncertainty:
300 yocto meters

Metric (SI) Dimensions:
length

Note:
The value for this measured constant was obtained from NIST. See their section on constants, units, and uncertainty for more information.

Name:
nail
(convert nail to new units)

Metric (SI) Equivalent:
5.715 centi meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
(9 / 4) inches

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
natural-unit-of-length
(convert natural-unit-of-length to new units)

Another Name:
Compton-wavelength-over-2-pi

Metric (SI) Equivalent:
386.1592678 femto meters

Standard Uncertainty:
2.6 zepto meters

Metric (SI) Dimensions:
length

Note:
The value for this measured constant was obtained from NIST. See their section on constants, units, and uncertainty for more information.

Name:
nautical-league
(convert nautical-league to new units)

Abbreviation:
nleag

Another Name:
naut-leag

Belongs to:
league Group

Metric (SI) Equivalent:
5.556 kilo meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
3 nautical-miles

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
nautical-league-UK
(convert nautical-league-UK to new units)

Abbreviation:
nleag-UK

Another Name:
naut-leag-UK

Belongs to:
league Group

Metric (SI) Equivalent:
5.559 kilo meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
3 nautical-miles-UK

Notes:
(1) The "UK" suffix indicates that this unit is used in the United Kingdom.
(2) The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
nautical-mile
(convert nautical-mile to new units)

Abbreviation:
nmi

Another Name:
naut-mi

Belongs to:
mile Group

Metric (SI) Equivalent:
1.852 kilo meters

Metric (SI) Dimensions:
length

Note:
The metric (SI) equivalent above is exact.

Name:
nautical-mile-UK
(convert nautical-mile-UK to new units)

Abbreviation:
nmi-UK

Another Name:
naut-mi-UK

Belongs to:
mile Group

Metric (SI) Equivalent:
1.853 kilo meters

Metric (SI) Dimensions:
length

Notes:
(1) The "UK" suffix indicates that this unit is used in the United Kingdom.
(2) The metric (SI) equivalent above is exact.

Name:
neutron-Compton-wavelength
(convert neutron-Compton-wavelength to new units)

Abbreviation:
lambda-C-n

Metric (SI) Equivalent:
1.3195909067 femto meters

Standard Uncertainty:
8.8 yocto meters

Metric (SI) Dimensions:
length

Note:
The value for this measured constant was obtained from NIST. See their section on constants, units, and uncertainty for more information.

Name:
palm
(convert palm to new units)

Abbreviation:
plm

Metric (SI) Equivalent:
7.62 centi meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
3 inches

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
parsec
(convert parsec to new units)

Abbreviation:
pc

Metric (SI) Equivalent:
3.0856781858e+13 kilo meters

Metric (SI) Dimensions:
length

Name:
perche-length
(convert perche-length to new units)

Metric (SI) Equivalent:
5.8471308 meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
18 feet-French-measure

Notes:
(1) Quebec survey unit
(2) The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
pica-computing
(convert pica-computing to new units)

Other Names:
pica, Postscript-pica

Belongs to:
pica Group

Metric (SI) Equivalent:
4.2333333333 milli meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
12 points-computing

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
pica-printing
(convert pica-printing to new units)

Another Name:
American-pica

Belongs to:
pica Group

Metric (SI) Equivalent:
4.20624 milli meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
12 points-printing

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
pica-tex
(convert pica-tex to new units)

Belongs to:
pica Group

Metric (SI) Equivalent:
4.2175176422 milli meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
12 points-tex

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
Planck-length
(convert Planck-length to new units)

Abbreviation:
l-P

Metric (SI) Equivalent:
1.61624e-35 meters

Standard Uncertainty:
1.2e-39 meters

Metric (SI) Dimensions:
length

Note:
The value for this measured constant was obtained from NIST. See their section on constants, units, and uncertainty for more information.

Name:
point-computing
(convert point-computing to new units)

Abbreviation:
pt

Other Names:
point, PostScript-point

Belongs to:
point Group

Metric (SI) Equivalent:
352.77777778 micro meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
inch / 72

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
point-printing
(convert point-printing to new units)

Abbreviation:
pt-printing

Another Name:
American-point

Belongs to:
point Group

Metric (SI) Equivalent:
350.52 micro meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
0.0138 inches

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
point-tex
(convert point-tex to new units)

Abbreviation:
pt-tex

Belongs to:
point Group

Metric (SI) Equivalent:
351.45980351 micro meters

Metric (SI) Dimensions:
length

Description in Terms of
Other Units and Constants:
inch / 72.27

Note:
The metric (SI) equivalent above was calculated from exact values using double-precision arithmetic.

Name:
proton-Compton-wavelength
(convert proton-Compton-wavelength to new units)

Abbreviation:
lambda-C-p

Metric (SI) Equivalent:
1.3214098555 femto meters

Standard Uncertainty:
8.8