TechTools

Length Converter

From
To
Sig. figures:

Picometer

pm

1.000000e+12

Angstrom

Å

1.000000e+10

Nanometer

nm

1.00000e+9

Micrometer

μm

1.00000e+6

Millimeter

mm

1000

Centimeter

cm

100

Decimeter

dm

10

Meter

m

1(input)

Kilometer

km

0.001

Megameter

Mm

1.000000e-6

Thou (Mil)

mil

39370.1

Inch

in

39.3701

Foot

ft

3.28084

Yard

yd

1.09361

Chain

ch

0.0497097

Furlong

fur

0.00497097

Mile

mi

0.000621371

League

lea

0.000207124

Fathom

ftm

0.546807

Nautical Mile

nmi

0.000539957

Astronomical Unit

AU

6.684587e-12

Light-year

ly

1.057001e-16

Parsec

pc

3.240779e-17

Point (pt)

pt

2834.64

Pica

pi

236.22

Hover any row to copy the value or use it as the new input.

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A comprehensive length and distance converter that shows conversions across all unit systems simultaneously. Supports 25+ units spanning Metric (picometer to megameter, angstrom), Imperial/US (thou, inch, foot, yard, chain, furlong, mile, league), Nautical (fathom, nautical mile), Astronomical (astronomical unit, light-year, parsec), and Typography (point, pica). Type a value, pick a unit, and instantly see every other unit's equivalent. Click any result row to use that value as the new input for reverse conversions. Adjust significant figures (3–12) and toggle scientific notation for very large or tiny values. Includes a collapsible quick-reference table of the most common conversions. 100% browser-based - no data leaves your device.

How to Use

  1. 1Type a number in the input field at the top
  2. 2Select your starting unit from the dropdown (e.g. Meter, Foot, Mile)
  3. 3All conversions appear instantly, grouped by unit system: Metric, Imperial/US, Nautical, Astronomical, and Typography
  4. 4Hover any result row to reveal the copy and swap buttons
  5. 5Click the copy icon to copy a value to your clipboard
  6. 6Click the swap icon (⇅) on any row to use that unit as the new input and reverse the conversion
  7. 7Adjust 'Sig. figures' to control result precision (3 to 12 significant digits)
  8. 8Toggle 'Sci notation' to display very large or very small values in exponential form
  9. 9Collapse a unit group by clicking its header to reduce clutter
  10. 10Open 'Common conversions' at the bottom for a quick reference table

Features

  • 25+ length and distance units across 5 unit systems
  • Metric: picometer, angstrom, nanometer, micrometer, millimeter, centimeter, decimeter, meter, kilometer, megameter
  • Imperial/US: thou (mil), inch, foot, yard, chain, furlong, mile, league
  • Nautical: fathom, nautical mile
  • Astronomical: astronomical unit (AU), light-year, parsec
  • Typography: point (pt), pica
  • All conversions shown simultaneously - no need to pick a 'to' unit
  • Click any result row to use it as the new input (instant reverse conversion)
  • Adjustable significant figures: 3, 4, 5, 6, 8, 10, or 12 digits
  • Toggleable scientific notation for very large and very small values
  • Collapsible unit-system groups to reduce visual clutter
  • One-click copy to clipboard for any converted value
  • Common conversions quick-reference table (metric ↔ imperial, nautical, astronomical)
  • 100% browser-based - no server, no data upload

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