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Length Converter

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Length Converter

Convert between metric and imperial distance units with formulas, examples, and lookup tables.

About this converter

Length conversion is one of the most common requirements across construction, logistics, manufacturing, and education. This converter groups frequently used metric and imperial units into one consistent reference.

The base unit for this converter is meter, which lets us map each unit into one consistent formula layer before converting to the target unit.

Quick examples

15 mm to um15,000 um

15 mm to nm15,000,000 nm

15 um to mm0.015 mm

15 um to nm15,000 nm

15 nm to mm0.000015 mm

15 nm to um0.015 um

15 cm to mm150 mm

15 cm to um150,000 um

Available units

Millimeter

A metric unit used for small distances and product dimensions.

mm to um mm to nm mm to cm

Also written as millimeters, millimetre, millimetres.

Micrometer

A metric unit used for microscopic distances and precision measurement.

um to mm um to nm um to cm

Also written as micrometers, micrometre, micrometres, micron, microns.

Nanometer

A metric unit for nanoscale lengths.

nm to mm nm to um nm to cm

Also written as nanometers, nanometre, nanometres.

Centimeter

A metric unit often used for everyday measurements.

cm to mm cm to um cm to nm

Also written as centimeters, centimetre, centimetres.

Decimeter

A metric unit equal to one tenth of a meter.

dm to mm dm to um dm to nm

Also written as decimeters, decimetre, decimetres.

Meter

The SI base unit for length.

m to mm m to um m to nm

Also written as meters, metre, metres.

Kilometer

A metric unit used for long distances.

km to mm km to um km to nm

Also written as kms, kilometers, kilometre, kilometres.

Inch

An imperial and US customary unit for small lengths.

in to mm in to um in to nm

Also written as inches, ".

Foot

An imperial and US customary unit for medium distances.

ft to mm ft to um ft to nm

Also written as feet, '.

Yard

A customary unit often used in sports and textiles.

yd to mm yd to um yd to nm

Also written as yds, yards.

Mile

A customary unit used for long travel distances.

mi to mm mi to um mi to nm

Also written as miles.

Light Year

An astronomical unit for interstellar distances.

ly to mm ly to um ly to nm

Also written as lightyear, lightyears, light years.

Exameter

Exameter is a metric length unit built from decimal SI prefixes.

Em to mm Em to um Em to nm

Petameter

Petameter is a metric length unit built from decimal SI prefixes.

Pm to mm Pm to um Pm to nm

Terameter

Terameter is a metric length unit built from decimal SI prefixes.

Tm to mm Tm to um Tm to nm

Gigameter

Gigameter is a metric length unit built from decimal SI prefixes.

Gm to mm Gm to um Gm to nm

Megameter

Megameter is a metric length unit built from decimal SI prefixes.

Mm to mm Mm to um Mm to nm

Hectometer

Hectometer is a metric length unit built from decimal SI prefixes.

hm to mm hm to um hm to nm

Dekameter

dam

Dekameter is a metric length unit built from decimal SI prefixes.

dam to mm dam to um dam to nm

Micron

Micron is a metric length unit built from decimal SI prefixes.

u to mm u to um u to nm

Picometer

Picometer is a metric length unit built from decimal SI prefixes.

pm to mm pm to um pm to nm

Femtometer

Femtometer is a metric length unit built from decimal SI prefixes.

fm to mm fm to um fm to nm

Attometer

Attometer is a metric length unit built from decimal SI prefixes.

am to mm am to um am to nm

Megaparsec

Mpc

Megaparsec is an astronomical length unit for very large distance comparisons.

Mpc to mm Mpc to um Mpc to nm

Kiloparsec

kpc

Kiloparsec is an astronomical length unit for very large distance comparisons.

kpc to mm kpc to um kpc to nm

Parsec

Parsec is an astronomical length unit for very large distance comparisons.

pc to mm pc to um pc to nm

Astronomical Unit

Astronomical Unit is an astronomical length unit for very large distance comparisons.

AU to mm AU to um AU to nm

League

lea

League is a specialist length unit for less common conversion scenarios.

lea to mm lea to um lea to nm

Nautical League UK

nlea UK

Nautical League UK is a nautical length unit connected to marine navigation and depth measurement.

nlea UK to mm nlea UK to um nlea UK to nm

Nautical League International

nlea

Nautical League International is a nautical length unit connected to marine navigation and depth measurement.

nlea to mm nlea to um nlea to nm

League Statute

st league

League Statute is a specialist length unit for less common conversion scenarios.

st league to mm st league to um st league to nm

Nautical Mile UK

NM UK

Nautical Mile UK is a nautical length unit connected to marine navigation and depth measurement.

NM UK to mm NM UK to um NM UK to nm

Nautical Mile International

nmi

Nautical Mile International is a nautical length unit connected to marine navigation and depth measurement.

nmi to mm nmi to um nmi to nm

Mile Statute

mi US

Mile Statute is a small-scale length unit used in typography, machining, or technical measurement.

mi US to mm mi US to um mi US to nm

Mile US Survey

mi US survey

Mile US Survey is a land-survey length unit used in mapping and property measurement.

mi US survey to mm mi US survey to um mi US survey to nm

Mile Roman

Roman mi

Mile Roman is a small-scale length unit used in typography, machining, or technical measurement.

Roman mi to mm Roman mi to um Roman mi to nm

Kiloyard

kyd

Kiloyard is a specialist length unit for less common conversion scenarios.

kyd to mm kyd to um kyd to nm

Furlong

fur

Furlong is a land-survey length unit used in mapping and property measurement.

fur to mm fur to um fur to nm

Furlong US Survey

fur US survey

Furlong US Survey is a land-survey length unit used in mapping and property measurement.

fur US survey to mm fur US survey to um fur US survey to nm

Chain

Chain is a land-survey length unit used in mapping and property measurement.

ch to mm ch to um ch to nm

Chain US Survey

ch US survey

Chain US Survey is a land-survey length unit used in mapping and property measurement.

ch US survey to mm ch US survey to um ch US survey to nm

Rope

rope

Rope is a specialist length unit for less common conversion scenarios.

rope to mm rope to um rope to nm

Rod

Rod is a land-survey length unit used in mapping and property measurement.

rd to mm rd to um rd to nm

Rod US Survey

rd US survey

Rod US Survey is a land-survey length unit used in mapping and property measurement.

rd US survey to mm rd US survey to um rd US survey to nm

Perch

perch

Perch is a specialist length unit for less common conversion scenarios.

perch to mm perch to um perch to nm

Pole

pole

Pole is a specialist length unit for less common conversion scenarios.

pole to mm pole to um pole to nm

Fathom

fath

Fathom is a nautical length unit connected to marine navigation and depth measurement.

fath to mm fath to um fath to nm

Fathom US Survey

fath US survey

Fathom US Survey is a nautical length unit connected to marine navigation and depth measurement.

fath US survey to mm fath US survey to um fath US survey to nm

Ell

ell

Ell is a historical or regional length unit.

ell to mm ell to um ell to nm

Foot US Survey

ft US survey

Foot US Survey is a land-survey length unit used in mapping and property measurement.

ft US survey to mm ft US survey to um ft US survey to nm

Link

Link is a land-survey length unit used in mapping and property measurement.

li to mm li to um li to nm

Link US Survey

li US survey

Link US Survey is a land-survey length unit used in mapping and property measurement.

li US survey to mm li US survey to um li US survey to nm

Cubit UK

cubit UK

Cubit UK is a historical or regional length unit.

cubit UK to mm cubit UK to um cubit UK to nm

Hand (4 in)

hand

Hand (4 in) is a body- or trade-derived customary length unit.

hand to mm hand to um hand to nm

Span Cloth

span

Span Cloth is a body- or trade-derived customary length unit.

span to mm span to um span to nm

Finger Cloth

finger

Finger Cloth is a body- or trade-derived customary length unit.

finger to mm finger to um finger to nm

Nail Cloth

nail

Nail Cloth is a body- or trade-derived customary length unit.

nail to mm nail to um nail to nm

Inch US Survey

in US survey

Inch US Survey is a land-survey length unit used in mapping and property measurement.

in US survey to mm in US survey to um in US survey to nm

Barleycorn

barleycorn

Barleycorn is a body- or trade-derived customary length unit.

barleycorn to mm barleycorn to um barleycorn to nm

Mil

mil

Mil is a small-scale length unit used in typography, machining, or technical measurement.

mil to mm mil to um mil to nm

Microinch

uin

Microinch is a small-scale length unit used in typography, machining, or technical measurement.

uin to mm uin to um uin to nm

Angstrom

Angstrom is a scientific length unit for atomic, nuclear, or theoretical scales.

A to mm A to um A to nm

Atomic Unit Of Length

a.u.

Atomic Unit Of Length is a scientific length unit for atomic, nuclear, or theoretical scales.

a.u. to mm a.u. to um a.u. to nm

X-unit

X-unit is a scientific length unit for atomic, nuclear, or theoretical scales.

X to mm X to um X to nm

Fermi

Fermi is a scientific length unit for atomic, nuclear, or theoretical scales.

f to mm f to um f to nm

Arpent

arpent

Arpent is a historical or regional length unit.

arpent to mm arpent to um arpent to nm

Pica

pica

Pica is a small-scale length unit used in typography, machining, or technical measurement.

pica to mm pica to um pica to nm

Point

Point is a small-scale length unit used in typography, machining, or technical measurement.

pt to mm pt to um pt to nm

Twip

twip

Twip is a small-scale length unit used in typography, machining, or technical measurement.

twip to mm twip to um twip to nm

Aln

aln

Aln is a historical or regional length unit.

aln to mm aln to um aln to nm

Famn

famn

Famn is a historical or regional length unit.

famn to mm famn to um famn to nm

Caliber

Caliber is a small-scale length unit used in typography, machining, or technical measurement.

cl to mm cl to um cl to nm

Centiinch

cin

Centiinch is a small-scale length unit used in typography, machining, or technical measurement.

cin to mm cin to um cin to nm

Ken

ken

Ken is a historical or regional length unit.

ken to mm ken to um ken to nm

Russian Archin

archin

Russian Archin is a historical or regional length unit.

archin to mm archin to um archin to nm

Roman Actus

actus

Roman Actus is a historical or regional length unit.

actus to mm actus to um actus to nm

Vara De Tarea

vara

Vara De Tarea is a historical or regional length unit.

vara to mm vara to um vara to nm

Vara Conuquera

vara

Vara Conuquera is a historical or regional length unit.

vara to mm vara to um vara to nm

Vara Castellana

vara

Vara Castellana is a historical or regional length unit.

vara to mm vara to um vara to nm

Cubit Greek

cubit Greek

Cubit Greek is a historical or regional length unit.

cubit Greek to mm cubit Greek to um cubit Greek to nm

Long Reed

long reed

Long Reed is a historical or regional length unit.

long reed to mm long reed to um long reed to nm

Reed

reed

Reed is a historical or regional length unit.

reed to mm reed to um reed to nm

Long Cubit

long cubit

Long Cubit is a historical or regional length unit.

long cubit to mm long cubit to um long cubit to nm

Handbreadth (3 in)

handbreadth 3 in

Handbreadth (3 in) is a body- or trade-derived customary length unit.

handbreadth 3 in to mm handbreadth 3 in to um handbreadth 3 in to nm

Handbreadth (4 in)

handbreadth 4 in

Handbreadth (4 in) is a body- or trade-derived customary length unit.

handbreadth 4 in to mm handbreadth 4 in to um handbreadth 4 in to nm

Handbreadth (10 cm)

handbreadth 10 cm

Handbreadth (10 cm) is a body- or trade-derived customary length unit.

handbreadth 10 cm to mm handbreadth 10 cm to um handbreadth 10 cm to nm

Fingerbreadth

fingerbreadth

Fingerbreadth is a body- or trade-derived customary length unit.

fingerbreadth to mm fingerbreadth to um fingerbreadth to nm

Planck Length

Planck length

Planck Length is a scientific length unit for atomic, nuclear, or theoretical scales.

Planck length to mm Planck length to um Planck length to nm

Electron Radius Classical

electron radius

Electron Radius Classical is a scientific length unit for atomic, nuclear, or theoretical scales.

electron radius to mm electron radius to um electron radius to nm

Bohr Radius

Bohr Radius is a scientific length unit for atomic, nuclear, or theoretical scales.

b to mm b to um b to nm

Earth Equatorial Radius

earth eq radius

Earth Equatorial Radius is an astronomical length unit for very large distance comparisons.

earth eq radius to mm earth eq radius to um earth eq radius to nm

Earth Polar Radius

earth polar radius

Earth Polar Radius is an astronomical length unit for very large distance comparisons.

earth polar radius to mm earth polar radius to um earth polar radius to nm

Earth Distance From Sun

earth-sun distance

Earth Distance From Sun is an astronomical length unit for very large distance comparisons.

earth-sun distance to mm earth-sun distance to um earth-sun distance to nm

Sun Radius

sun radius

Sun Radius is an astronomical length unit for very large distance comparisons.

sun radius to mm sun radius to um sun radius to nm

Main pair pages

More routes in this section

Millimeter to Micrometer Millimeter to Nanometer Millimeter to Centimeter Millimeter to Decimeter Micrometer to Millimeter Micrometer to Nanometer Micrometer to Centimeter Micrometer to Decimeter Nanometer to Millimeter Nanometer to Micrometer Nanometer to Centimeter Nanometer to Decimeter

Common Converters