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Length

Characteristic

angstrom

Notes

Symbol

Å

Use "A" for our conversion calculators.

Other Names

Ang, tenthmeter, tenthmetre

Metric (SI) Equivalent

100 picometers

This equivalent is exact.

Metric (SI) Dimensions

length

Characteristic

angstrom-star

Notes

Symbol

Å*

Use "A-star" for our conversion calculators.

Metric (SI) Equivalent

1.00001495×10-10 meters

Standard Uncertainty

± 9×10-17 meters

Metric (SI) Dimensions

length

Characteristic

arpent-length

( Quebec survey unit )

Notes

Metric (SI) Equivalent

58.471308 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

180 feet-French-measure

Characteristic

astronomical-unit

Notes

Symbol

AU

Other Name

UA

Metric (SI) Equivalent

1.495978707×108 kilometers

Standard Uncertainty

± 3 meters

Metric (SI) Dimensions

length

Characteristic

barleycorn

Notes

Metric (SI) Equivalent

8.4666666667 millimeters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

inch / 3

Characteristic

baromil

Notes

Other Name

barometer-mil

Metric (SI) Equivalent

750.0616827 micrometers

Metric (SI) Dimensions

length

Characteristic

Bohr-radius

Notes

Symbol

a0

Use "a-0" for our conversion calculators.

Other Names

Rb, atomic-unit-of-length, bohr, first-Bohr-radius

Metric (SI) Equivalent

5.2917721092×10-11 meters

Standard Uncertainty

± 1.7×10-20 meters

Metric (SI) Dimensions

length

Characteristic

bolt

( Used for measuring cloth )

Notes

Metric (SI) Equivalent

36.576 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

40 yards

Characteristic

cable-length

Notes

Metric (SI) Equivalent

219.456 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

120 fathoms

Unit Group

cable-length Group

Characteristic

cable-length-non-US-UK

( Unit used outside the United States and the United Kingdom )

Notes

Metric (SI) Equivalent

185.2 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

nautical-mile / 10

Unit Group

cable-length Group

Characteristic

cable-length-UK

( Used in the United Kingdom )

Notes

Metric (SI) Equivalent

185.3 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

nautical-mile-UK / 10

Unit Group

cable-length Group

Characteristic

cable-length-US-survey

( Used in the United States for some survey measurements )

Notes

Other Name

survey-cable-length

Metric (SI) Equivalent

219.45643891 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

120 fathoms-US-survey

Unit Group

cable-length Group

Characteristic

caliber

Notes

Other Name

calibre

Metric (SI) Equivalent

254 micrometers

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

inch / 100

Characteristic

chain

Notes

Symbol

ch

Other Name

international-chain

Metric (SI) Equivalent

20.1168 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

100 links

Unit Group

chain Group

Characteristic

chain-engineer

Notes

Other Names

ch-eng, chain-ramsden

Metric (SI) Equivalent

30.48 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

100 links-engineer

Unit Group

chain Group

Characteristic

chain-US-survey

( Used in the United States for some survey measurements )

Notes

Other Names

ch-US-survey, survey-chain, chain-surveyor, chain-gunter

Metric (SI) Equivalent

20.116840234 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

100 links-US-survey

Unit Group

chain Group

Characteristic

classical-electron-radius

Notes

Symbol

re

Use "r-e" for our conversion calculators.

Metric (SI) Equivalent

2.8179403267×10-15 meters

Standard Uncertainty

± 2.7×10-24 meters

Metric (SI) Dimensions

length

Characteristic

Compton-wavelength

Notes

Symbol

λC

Use "lambda-C" for our conversion calculators.

Metric (SI) Equivalent

2.4263102389×10-12 meters

Standard Uncertainty

± 1.6×10-21 meters

Metric (SI) Dimensions

length

Characteristic

cubit

Notes

Metric (SI) Equivalent

0.4572 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

18 inches

Characteristic

ell

Notes

Metric (SI) Equivalent

1.143 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

45 inches

Characteristic

fathom

Notes

Symbol

fath

Other Name

international-fathom

Metric (SI) Equivalent

1.8288 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

2 yards

Unit Group

fathom Group

Characteristic

fathom-US-survey

( Used in the United States for some survey measurements )

Notes

Other Names

fath-US-survey, survey-fathom

Metric (SI) Equivalent

1.8288036576 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

2 yards-US-survey

Unit Group

fathom Group

Characteristic

fermi

Notes

Metric (SI) Equivalent

1 femtometer

This equivalent is exact.

Metric (SI) Dimensions

length

Characteristic

foot-French-measure

( Quebec survey unit )

Notes

Other Names

ft-French-measure, foot-Paris, Paris-foot, pied

Metric (SI) Equivalent

0.3248406 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

12.789 inches

Unit Group

foot Group

Characteristic

foot-US-survey

( Used in the United States for some survey measurements )

Notes

Other Names

ft-US-survey, survey-foot

Metric (SI) Equivalent

0.3048006096 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

(1200 / 3937) meters

Unit Group

foot Group

Characteristic

furlong

Notes

Symbol

fur

Other Name

international-furlong

Metric (SI) Equivalent

201.168 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

660 feet

Unit Group

furlong Group

Characteristic

furlong-US-survey

( Used in the United States for some survey measurements )

Notes

Other Names

fur-US-survey, survey-furlong

Metric (SI) Equivalent

201.16840234 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

660 feet-US-survey

Unit Group

furlong Group

Characteristic

hand

Notes

Symbol

hd

Metric (SI) Equivalent

0.1016 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

4 inches

Characteristic

inch

Notes

Symbol

in

Other Names

", international-inch

Metric (SI) Equivalent

2.54 centimeters

This equivalent is exact.

Metric (SI) Dimensions

length

Unit Group

inch Group

Characteristic

inch-US-survey

( Used in the United States for some survey measurements )

Notes

Other Names

in-US-survey, survey-inch

Metric (SI) Equivalent

2.54000508 centimeters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

foot-US-survey / 12

Unit Group

inch Group

Characteristic

klick

Notes

Metric (SI) Equivalent

1 kilometer

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

1000 meters

Characteristic

lattice-parameter-of-silicon

( Value in vacuum at 22.5 °C )

Notes

Metric (SI) Equivalent

5.431020504×10-10 meters

Standard Uncertainty

± 8.9×10-18 meters

Metric (SI) Dimensions

length

Characteristic

lattice-spacing-of-silicon

( Value in vacuum at 22.5 °C )

Notes

Symbol

d220

Use "d-220" for our conversion calculators.

Metric (SI) Equivalent

1.920155714×10-10 meters

Standard Uncertainty

± 3.2×10-18 meters

Metric (SI) Dimensions

length

Characteristic

league-US-survey

( Used in the United States for some survey measurements )

Notes

Other Names

leag-US-survey, survey-league, statute-league

Metric (SI) Equivalent

4.8280416561 kilometers

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

3 miles-US-survey

Unit Group

league Group

Characteristic

light-year

Notes

Symbol

ly

Other Names

lyr, ltyr

Metric (SI) Equivalent

9.4607304726×1012 kilometers

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

speed-of-light-in-vacuum year

Characteristic

line-length

Notes

Other Names

line, button

Metric (SI) Equivalent

2.1166666667 millimeters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

inch / 12

Characteristic

meter

Notes

Symbol

m

Other Name

metre

Metric (SI) Equivalent

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

Metric (SI) Dimensions

length

Characteristic

micron

Notes

Symbol

μ

Use "mu" for our conversion calculators.

Metric (SI) Equivalent

1 micrometer

This equivalent is exact.

Metric (SI) Dimensions

length

Characteristic

mile

Notes

Symbol

mi

Other Names

international-mile, land-mile

Metric (SI) Equivalent

1.609344 kilometers

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

5280 feet

Unit Group

mile Group

Characteristic

mile-US-survey

( Used in the United States for some survey measurements )

Notes

Other Names

mi-US-survey, survey-mile, statute-mile

Metric (SI) Equivalent

1.6093472187 kilometers

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

5280 feet-US-survey

Unit Group

mile Group

Characteristic

mil-length

Notes

Other Names

thou, mil

Metric (SI) Equivalent

25.4 micrometers

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

inch / 1000

Characteristic

muon-Compton-wavelength

Notes

Symbol

λC,μ

Use "lambda-C-mu" for our conversion calculators.

Metric (SI) Equivalent

1.173444103×10-14 meters

Standard Uncertainty

± 3×10-22 meters

Metric (SI) Dimensions

length

Characteristic

nail

Notes

Metric (SI) Equivalent

5.715 centimeters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

(9 / 4) inches

Characteristic

natural-unit-of-length

Notes

Other Name

Compton-wavelength-over-2-pi

Metric (SI) Equivalent

3.86159268×10-13 meters

Standard Uncertainty

± 2.5×10-22 meters

Metric (SI) Dimensions

length

Characteristic

nautical-league-UK

( Used in the United Kingdom )

Notes

Other Names

nleag-UK, naut-leag-UK

Metric (SI) Equivalent

5.559 kilometers

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

3 nautical-miles-UK

Unit Group

league Group

Characteristic

nautical-mile

Notes

Symbol

nmi

Other Name

naut-mi

Metric (SI) Equivalent

1.852 kilometers

This equivalent is exact.

Metric (SI) Dimensions

length

Unit Group

mile Group

Characteristic

nautical-mile-UK

( Used in the United Kingdom )

Notes

Other Names

nmi-UK, naut-mi-UK

Metric (SI) Equivalent

1.853 kilometers

This equivalent is exact.

Metric (SI) Dimensions

length

Unit Group

mile Group

Characteristic

neutron-Compton-wavelength

Notes

Symbol

λC,n

Use "lambda-C-n" for our conversion calculators.

Metric (SI) Equivalent

1.3195909068×10-15 meters

Standard Uncertainty

± 1.1×10-24 meters

Metric (SI) Dimensions

length

Characteristic

palm

Notes

Symbol

plm

Metric (SI) Equivalent

7.62 centimeters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

3 inches

Characteristic

parsec

Notes

Symbol

pc

Metric (SI) Equivalent

3.0856775815×1013 kilometers

Metric (SI) Dimensions

length

Characteristic

perche-length

( Quebec survey unit )

Notes

Metric (SI) Equivalent

5.8471308 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

18 feet-French-measure

Characteristic

pica-computing

Notes

Other Names

pica, Postscript-pica

Metric (SI) Equivalent

4.2333333333 millimeters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

12 points-computing

Unit Group

pica Group

Characteristic

pica-printing

Notes

Other Name

American-pica

Metric (SI) Equivalent

4.2175176 millimeters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

12 points-printing

Unit Group

pica Group

Characteristic

pica-tex

Notes

Metric (SI) Equivalent

4.2175176422 millimeters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

12 points-tex

Unit Group

pica Group

Characteristic

Planck-length

Notes

Symbol

lP

Use "l-P" for our conversion calculators.

Metric (SI) Equivalent

1.616199×10-35 meters

Standard Uncertainty

± 9.7×10-40 meters

Metric (SI) Dimensions

length

Characteristic

point-computing

Notes

Symbol

pt

Other Names

point, PostScript-point

Metric (SI) Equivalent

352.77777778 micrometers

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

inch / 72

Unit Group

point Group

Characteristic

point-printing

Notes

Other Names

pt-printing, American-point

Metric (SI) Equivalent

351.4598 micrometers

This equivalent is exact.

Metric (SI) Dimensions

length

Unit Group

point Group

Characteristic

point-tex

Notes

Other Name

pt-tex

Metric (SI) Equivalent

351.45980351 micrometers

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

inch / 72.27

Unit Group

point Group

Characteristic

proton-Compton-wavelength

Notes

Symbol

λC,p

Use "lambda-C-p" for our conversion calculators.

Metric (SI) Equivalent

1.3214098562×10-15 meters

Standard Uncertainty

± 9.4×10-25 meters

Metric (SI) Dimensions

length

Characteristic

rod

Notes

Symbol

rd

Other Names

international-rod, pole, international-pole, perch, international-perch

Metric (SI) Equivalent

5.0292 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

16.5 feet

Unit Group

rod Group

Characteristic

rod-US-survey

( Used in the United States for some survey measurements )

Notes

Other Names

rd-US-survey, survey-rod, survey-pole, survey-perch

Metric (SI) Equivalent

5.0292100584 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

16.5 feet-US-survey

Unit Group

rod Group

Characteristic

rope

Notes

Metric (SI) Equivalent

6.096 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

20 feet

Characteristic

siriometer

Notes

Other Name

siriometre

Metric (SI) Equivalent

149.5978707 petameters

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

1×106 astronomical-units

Characteristic

siriusweit

Notes

Metric (SI) Equivalent

154.28387907 petameters

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

5 parsecs

Characteristic

skein

Notes

Metric (SI) Equivalent

109.728 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

120 yards

Characteristic

span

Notes

Symbol

sp

Metric (SI) Equivalent

0.2286 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

9 inches

Characteristic

spat-length

Notes

Metric (SI) Equivalent

1 terameter

This equivalent is exact.

Metric (SI) Dimensions

length

Characteristic

tau-Compton-wavelength

Notes

Symbol

λC,τ

Use "lambda-C-tau" for our conversion calculators.

Metric (SI) Equivalent

6.97787×10-16 meters

Standard Uncertainty

± 6.3×10-20 meters

Metric (SI) Dimensions

length

Characteristic

yard

Notes

Symbol

yd

Other Name

international-yard

Metric (SI) Equivalent

0.9144 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

3 feet

Unit Group

yard Group

Characteristic

yard-US-survey

( Used in the United States for some survey measurements )

Notes

Other Names

yd-US-survey, survey-yard

Metric (SI) Equivalent

0.9144018288 meters

This equivalent is calculated from exact values.

Metric (SI) Dimensions

length

Description in Terms of Other Units and Constants

3 feet-US-survey

Unit Group

yard Group