Length | The Units and Constants Handbook at KnowledgeDoor

	Length
	Length

Characteristic		angstrom		Notes
Characteristic		angstrom		Notes
Symbol	Å			Use "A" for our conversion calculators.
Other Names	Ang, tenthmeter, tenthmetre
Metric (SI) Equivalent	100 pico meters			This equivalent is exact.
Metric (SI) Dimensions	length

Characteristic		angstrom-star		Notes
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
Characteristic		arpent-length ( Quebec survey unit )		Notes
Metric (SI) Equivalent	5.8471308 deka 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
Characteristic		astronomical-unit		Notes
Symbol	AU
Other Name	UA
Metric (SI) Equivalent	1.495978707×108 kilo meters
Standard Uncertainty	± 30 deci meters
Metric (SI) Dimensions	length

Characteristic		barleycorn		Notes
Characteristic		barleycorn		Notes
Metric (SI) Equivalent	8.4666666667 milli meters			This equivalent is calculated from exact values.
Metric (SI) Dimensions	length
Description in Terms of Other Units and Constants	inch / 3

Characteristic		baromil		Notes
Characteristic		baromil		Notes
Other Name	barometer-mil
Metric (SI) Equivalent	750.0616827 micro meters
Metric (SI) Dimensions	length

Characteristic		Bohr-radius		Notes
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	5.291772109×10-11 meters
Standard Uncertainty	± 8×10-21 meters
Metric (SI) Dimensions	length

Characteristic		bolt ( Used for measuring cloth )		Notes
Characteristic		bolt ( Used for measuring cloth )		Notes
Metric (SI) Equivalent	3.6576 deka 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
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
Characteristic				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
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
Characteristic				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
Characteristic		caliber		Notes
Other Name	calibre
Metric (SI) Equivalent	254 micro meters			This equivalent is calculated from exact values.
Metric (SI) Dimensions	length
Description in Terms of Other Units and Constants	inch / 100

Characteristic		chain		Notes
Characteristic		chain		Notes
Symbol	ch
Other Name	international-chain
Metric (SI) Equivalent	2.01168 deka 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
Characteristic		chain-engineer		Notes
Other Names	ch-eng, chain-ramsden
Metric (SI) Equivalent	3.048 deka 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
Characteristic				Notes
Other Names	ch-US-survey, survey-chain, chain-surveyor, chain-gunter
Metric (SI) Equivalent	2.0116840234 deka 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
Characteristic		classical-electron-radius		Notes
Symbol	re			Use "r-e" for our conversion calculators.
Metric (SI) Equivalent	2.8179403262×10-15 meters
Standard Uncertainty	± 1.3×10-24 meters
Metric (SI) Dimensions	length

Characteristic		Compton-wavelength		Notes
Characteristic		Compton-wavelength		Notes
Symbol	λC			Use "lambda-C" for our conversion calculators.
Metric (SI) Equivalent	2.4263102387×10-12 meters
Standard Uncertainty	± 7.3×10-22 meters
Metric (SI) Dimensions	length

Characteristic		cubit		Notes
Characteristic		cubit		Notes
Metric (SI) Equivalent	4.572 deci 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
Characteristic		ell		Notes
Metric (SI) Equivalent	11.43 deci 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
Characteristic		fathom		Notes
Symbol	fath
Other Name	international-fathom
Metric (SI) Equivalent	18.288 deci 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
Characteristic				Notes
Other Names	fath-US-survey, survey-fathom
Metric (SI) Equivalent	18.288036576 deci 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
Characteristic		fermi		Notes
Metric (SI) Equivalent	1 femto meter			This equivalent is exact.
Metric (SI) Dimensions	length

Characteristic		foot		Notes
Characteristic		foot		Notes
Symbol	ft
Other Names	feet, ', international-foot
Metric (SI) Equivalent	3.048 deci meters			This equivalent is calculated from exact values.
Metric (SI) Dimensions	length
Description in Terms of Other Units and Constants	12 inches
Unit Group	foot Group

Characteristic		foot-French-measure ( Quebec survey unit )		Notes
Characteristic		foot-French-measure ( Quebec survey unit )		Notes
Other Names	ft-French-measure, foot-Paris, Paris-foot, pied
Metric (SI) Equivalent	3.248406 deci 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
Characteristic				Notes
Other Names	ft-US-survey, survey-foot
Metric (SI) Equivalent	3.048006096 deci 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
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
Characteristic				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
Characteristic		hand		Notes
Symbol	hd
Metric (SI) Equivalent	1.016 deci 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
Characteristic		inch		Notes
Symbol	in
Other Names	", international-inch
Metric (SI) Equivalent	2.54 centi meters			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
Characteristic				Notes
Other Names	in-US-survey, survey-inch
Metric (SI) Equivalent	2.54000508 centi meters			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
Characteristic		klick		Notes
Metric (SI) Equivalent	1000 meters			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
Characteristic				Notes
Metric (SI) Equivalent	5.431020511×10-10 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
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	1.920155716×10-10 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
Characteristic				Notes
Other Names	leag-US-survey, survey-league, statute-league
Metric (SI) Equivalent	4.8280416561 kilo meters			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
Characteristic		light-year		Notes
Symbol	ly
Other Names	lyr, ltyr
Metric (SI) Equivalent	9.4607304726×1012 kilo meters
Metric (SI) Dimensions	length
Description in Terms of Other Units and Constants	speed-of-light-in-vacuum year

Characteristic		line-length		Notes
Characteristic		line-length		Notes
Other Names	line, button
Metric (SI) Equivalent	2.1166666667 milli meters			This equivalent is calculated from exact values.
Metric (SI) Dimensions	length
Description in Terms of Other Units and Constants	inch / 12

Characteristic		link		Notes
Characteristic		link		Notes
Symbol	li
Other Names	lk, international-link, link-gunter-UK, link-surveyor-UK			"UK" indicates that this unit is used in the United Kingdom.
Metric (SI) Equivalent	2.01168 deci meters			This equivalent is calculated from exact values.
Metric (SI) Dimensions	length
Description in Terms of Other Units and Constants	0.66 feet
Unit Group	link Group

Characteristic		link-engineer		Notes
Characteristic		link-engineer		Notes
Other Names	li-eng, lk-eng, link-ramsden
Metric (SI) Equivalent	3.048 deci meters			This equivalent is calculated from exact values.
Metric (SI) Dimensions	length
Description in Terms of Other Units and Constants	foot
Unit Group	link Group

Characteristic		link-US-survey ( Used in the United States for some survey measurements )		Notes
Characteristic				Notes
Other Names	li-US-survey, lk-US-survey, survey-link, link-surveyor, link-gunter
Metric (SI) Equivalent	2.0116840234 deci meters			This equivalent is calculated from exact values.
Metric (SI) Dimensions	length
Description in Terms of Other Units and Constants	0.66 feet-US-survey
Unit Group	link Group

Characteristic		meter		Notes
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
Characteristic		micron		Notes
Symbol	μ			Use "mu" for our conversion calculators.
Metric (SI) Equivalent	1 micro meter			This equivalent is exact.
Metric (SI) Dimensions	length

Characteristic		mile		Notes
Characteristic		mile		Notes
Symbol	mi
Other Names	international-mile, land-mile
Metric (SI) Equivalent	1.609344 kilo meters			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
Characteristic				Notes
Other Names	mi-US-survey, survey-mile, statute-mile
Metric (SI) Equivalent	1.6093472187 kilo meters			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
Characteristic		mil-length		Notes
Other Names	thou, mil
Metric (SI) Equivalent	25.4 micro meters			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
Characteristic		muon-Compton-wavelength		Notes
Symbol	λC,μ			Use "lambda-C-mu" for our conversion calculators.
Metric (SI) Equivalent	1.17344411×10-14 meters
Standard Uncertainty	± 2.6×10-22 meters
Metric (SI) Dimensions	length

Characteristic		nail		Notes
Characteristic		nail		Notes
Metric (SI) Equivalent	5.715 centi meters			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
Characteristic		natural-unit-of-length		Notes
Other Name	Compton-wavelength-over-2-pi
Metric (SI) Equivalent	3.8615926796×10-13 meters
Standard Uncertainty	± 1.2×10-22 meters
Metric (SI) Dimensions	length

Characteristic		nautical-league-UK ( Used in the United Kingdom )		Notes
Characteristic		nautical-league-UK ( Used in the United Kingdom )		Notes
Other Names	nleag-UK, naut-leag-UK
Metric (SI) Equivalent	5.559 kilo meters			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
Characteristic		nautical-mile		Notes
Symbol	nmi
Other Name	naut-mi
Metric (SI) Equivalent	1.852 kilo meters			This equivalent is exact.
Metric (SI) Dimensions	length
Unit Group	mile Group

Characteristic		nautical-mile-UK ( Used in the United Kingdom )		Notes
Characteristic		nautical-mile-UK ( Used in the United Kingdom )		Notes
Other Names	nmi-UK, naut-mi-UK
Metric (SI) Equivalent	1.853 kilo meters			This equivalent is exact.
Metric (SI) Dimensions	length
Unit Group	mile Group

Characteristic		neutron-Compton-wavelength		Notes
Characteristic		neutron-Compton-wavelength		Notes
Symbol	λC,n			Use "lambda-C-n" for our conversion calculators.
Metric (SI) Equivalent	1.3195909058×10-15 meters
Standard Uncertainty	± 7.5×10-25 meters
Metric (SI) Dimensions	length

Characteristic		palm		Notes
Characteristic		palm		Notes
Symbol	plm
Metric (SI) Equivalent	7.62 centi meters			This equivalent is calculated from exact values.
Metric (SI) Dimensions	length
Description in Terms of Other Units and Constants	3 inches

Characteristic		parsec		Notes
Characteristic		parsec		Notes
Symbol	pc
Metric (SI) Equivalent	3.0856775815×1013 kilo meters
Metric (SI) Dimensions	length

Characteristic		perche-length ( Quebec survey unit )		Notes
Characteristic		perche-length ( Quebec survey unit )		Notes
Metric (SI) Equivalent	58.471308 deci 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
Characteristic		pica-computing		Notes
Other Names	pica, Postscript-pica
Metric (SI) Equivalent	4.2333333333 milli meters			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
Characteristic		pica-printing		Notes
Other Name	American-pica
Metric (SI) Equivalent	4.2175176 milli meters			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
Characteristic		pica-tex		Notes
Metric (SI) Equivalent	4.2175176422 milli meters			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
Characteristic		Planck-length		Notes
Symbol	lP			Use "l-P" for our conversion calculators.
Metric (SI) Equivalent	1.616255×10-35 meters
Standard Uncertainty	± 1.8×10-40 meters
Metric (SI) Dimensions	length

Characteristic		point-computing		Notes
Characteristic		point-computing		Notes
Symbol	pt
Other Names	point, PostScript-point
Metric (SI) Equivalent	352.77777778 micro meters			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
Characteristic		point-printing		Notes
Other Names	pt-printing, American-point
Metric (SI) Equivalent	351.4598 micro meters			This equivalent is exact.
Metric (SI) Dimensions	length
Unit Group	point Group

Characteristic		point-tex		Notes
Characteristic		point-tex		Notes
Other Name	pt-tex
Metric (SI) Equivalent	351.45980351 micro meters			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
Characteristic		proton-Compton-wavelength		Notes
Symbol	λC,p			Use "lambda-C-p" for our conversion calculators.
Metric (SI) Equivalent	1.3214098554×10-15 meters
Standard Uncertainty	± 4×10-25 meters
Metric (SI) Dimensions	length

Characteristic		rod		Notes
Characteristic		rod		Notes
Symbol	rd
Other Names	international-rod, pole, international-pole, perch, international-perch
Metric (SI) Equivalent	50.292 deci 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
Characteristic				Notes
Other Names	rd-US-survey, survey-rod, survey-pole, survey-perch
Metric (SI) Equivalent	50.292100584 deci 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
Characteristic		rope		Notes
Metric (SI) Equivalent	60.96 deci 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
Characteristic		siriometer		Notes
Other Name	siriometre
Metric (SI) Equivalent	149.5978707 peta meters
Metric (SI) Dimensions	length
Description in Terms of Other Units and Constants	1×106 astronomical-units

Characteristic		siriusweit		Notes
Characteristic		siriusweit		Notes
Metric (SI) Equivalent	154.28387907 peta meters
Metric (SI) Dimensions	length
Description in Terms of Other Units and Constants	5 parsecs

Characteristic		skein		Notes
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
Characteristic		span		Notes
Symbol	sp
Metric (SI) Equivalent	2.286 deci 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
Characteristic		spat-length		Notes
Metric (SI) Equivalent	1 tera meter			This equivalent is exact.
Metric (SI) Dimensions	length

Characteristic		tau-Compton-wavelength		Notes
Characteristic		tau-Compton-wavelength		Notes
Symbol	λC,τ			Use "lambda-C-tau" for our conversion calculators.
Metric (SI) Equivalent	6.97771×10-16 meters
Standard Uncertainty	± 4.7×10-20 meters
Metric (SI) Dimensions	length

Characteristic		yard		Notes
Characteristic		yard		Notes
Symbol	yd
Other Name	international-yard
Metric (SI) Equivalent	9.144 deci 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
Characteristic				Notes
Other Names	yd-US-survey, survey-yard
Metric (SI) Equivalent	9.144018288 deci 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

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