Convert between 27 length units - meters, kilometers, miles, inches, feet, yards, light-years, nautical miles, and more. Instant, accurate, and completely free.
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— All Units —
27 Length Units
Explore all 27 length units below. Tap any conversion to load it into the converter above - one tool handles every pair.
📏
Meter
m
The SI base unit of length. Used worldwide for everyday and scientific measurements.
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🛣️
Kilometer
km
1,000 meters. Standard unit for road distances and geographic measurements.
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📐
Centimeter
cm
1/100 of a meter. Commonly used for body measurements and small objects.
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🔬
Millimeter
mm
1/1,000 of a meter. Used in engineering, machining, and precision work.
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🦠
Micrometer
µm
1/1,000,000 of a meter. Used in microbiology and semiconductor manufacturing.
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⚛️
Nanometer
nm
1/1,000,000,000 of a meter. Used for wavelengths of light and chip technology.
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🔮
Picometer
pm
1/1,000,000,000,000 of a meter. Used in atomic and molecular physics.
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📎
Inch
in
Imperial unit equal to 2.54 cm. Standard in the US for everyday measurements.
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👣
Foot
ft
12 inches or 0.3048 meters. Used for height, room dimensions, and elevation.
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🏈
Yard
yd
3 feet or 0.9144 meters. Used in American football and fabric measurement.
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🚗
Mile
mi
5,280 feet or 1.609 km. Standard for road distances in the US and UK.
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⚓
Nautical Mile
nmi
1,852 meters. Used in maritime and aviation navigation worldwide.
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🗺️
League
lea
Approximately 3 miles. Historical unit used in literature and early navigation.
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🌟
Light-year
ly
Distance light travels in one year (~9.461 trillion km). Used in astronomy.
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🪐
Astronomical Unit
AU
Average Earth-Sun distance (~149.6 million km). Used for solar system distances.
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🔭
Parsec
pc
~3.26 light-years. Used in professional astronomy for stellar distances.
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🚢
Fathom
fathom
6 feet or 1.8288 meters. Traditional unit for measuring water depth.
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🐴
Hand
hand
4 inches or 10.16 cm. Used to measure the height of horses.
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⛓️
Link
li
7.92 inches or ~20.12 cm. Used in land surveying as part of Gunter's chain.
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📍
Rod
rd
16.5 feet or ~5.03 meters. Historical land surveying unit.
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🔗
Chain
ch
66 feet or ~20.12 meters. Used in land surveying and agriculture.
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🏇
Furlong
fur
660 feet or 201.17 meters. Used in horse racing and agriculture.
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🤚
Span
span
9 inches or ~22.86 cm. Based on the width of an outstretched hand.
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📜
Cubit
cubit
~18 inches or 45.72 cm. Ancient unit based on forearm length.
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☝️
Finger
finger
7/8 inch or ~2.22 cm. Used historically for cloth measurement.
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✋
Palm
palm
3 inches or 7.62 cm. Ancient unit based on palm width.
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🧵
Ell
ell
45 inches or ~114.3 cm. Historical unit for measuring cloth and textiles.
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— How It Works —
Convert in 3 Steps
1
Pick Your Units
Select source and target units from 27 length measurements - metric, imperial, scientific, or historical.
2
Enter a Value
Type any number. Results update in real-time - no submit button needed. Works with decimals and large numbers.
3
Get Your Result
See the converted value with full precision plus the conversion formula. Copy or swap units with one click.
— Why Us —
Why Use Our Length Converter?
🎯
Formula-Driven Accuracy
Every conversion uses verified mathematical constants. No rounding shortcuts - full floating-point precision.
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100% Private
All calculations run locally in your browser. Zero data sent to servers, zero cookies, zero tracking.
📏
27 Units Covered
From everyday metric/imperial to scientific (light-year, parsec) and historical (cubit, fathom, ell) units.
⚡
Instant Real-Time
Results update as you type. No submit buttons, no page reloads - millisecond response time.
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Works on All Devices
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FAQ
Frequently Asked Questions
We support 27 length units spanning metric (meter, kilometer, centimeter, millimeter, micrometer, nanometer, picometer), imperial (inch, foot, yard, mile), maritime (nautical mile, fathom), astronomical (light-year, astronomical unit, parsec), and historical (league, hand, link, rod, chain, furlong, span, cubit, finger, palm, ell).
Yes. Every conversion uses internationally recognized conversion factors. For example, 1 inch = exactly 2.54 centimeters, 1 mile = exactly 1.609344 kilometers. Results are computed with full floating-point precision.
Simply select your source unit (e.g., Meter) and target unit (e.g., Foot) using the converter widget above, or click any unit card to see all its conversion options. Our most popular cross-system conversions include meter↔foot, kilometer↔mile, and centimeter↔inch.
These are traditional measurement units used historically. A cubit (~45.72 cm) is based on forearm length, used in ancient Egypt and biblical texts. A fathom (1.8288 m) measures water depth. A furlong (201.17 m) is still used in horse racing. We include these for research, education, and historical reference.
Yes. We support light-year (~9.461 trillion km), astronomical unit (~149.6 million km), and parsec (~3.26 light-years). These are used in astronomy to measure distances between stars and galaxies.
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