Free · Length conversions

Meter to Small & Large Length Units

Compare meters with micrometers, millimeters, customary dimensions and astronomical distances.

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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

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Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

One meter equals 100 cm, 1,000 mm or one million micrometers. The customary columns use exact international inch, foot and yard definitions.

Centimeters = meters × 100; millimeters = meters × 1,000; micrometers = meters × 1,000,000

Worked example

Enter these known values and leave the other values blank.

Length in meters
1 m
Length in micrometers
1000000 μm
Length in millimeters
1000 mm
Length in centimeters
100 cm
Length in kilometers
0.001 km
Other metric units
1000000000 nm
Length in inches
39.37 in
Length in feet
3.281 ft
Length in yards
1.0936 yd
Length in miles
0.0006214 mi
Other imperial units
39370 mil
Length in {{other_unit_1.fullUnit}}
0.00054 nmi
Length in {{other_unit_2.fullUnit}}
1.4374e-9 R☉ (nominal)
Length in {{other_unit_3.fullUnit}}
1.057e-16 ly

Assumptions and limitations

  • International units use exactly 25.4 mm per inch, 0.3048 m per foot, 0.9144 m per yard and 1,609.344 m per statute mile. A nautical mile is exactly 1,852 m.
  • Every field describes the same length. Zero and signed values are supported for directed measurements; a negative result does not describe a physical size. Display rounding does not increase the precision of the original measurement.
  • In a compound feet/inches field, use a colon: 1:6 means one foot six inches. Decimal 1.6 feet is one foot 7.2 inches. Read the selected unit when editing a flexible field.
  • A light-year is the distance light travels in vacuum in one 365.25-day Julian year: 9,460,730,472,580,800 m. A parsec is 648,000/π astronomical units; an astronomical unit is exactly 149,597,870,700 m. Mly and Mpc mean one million of their respective units.
  • The nominal solar-radius comparison uses 695,700,000 m. The optional Earth-radius comparison retains a fixed 6,371,000 m mean-radius scale. Neither option measures the actual radius at a chosen location or time.

Common questions

What changes when I choose a scientific unit?

Only the representation of the length changes. The optional astronomical fields use the stated distance conventions and do not estimate a celestial object’s position.

Can I work backward from a result?

Yes. Enter the known length in any editable field to update the other representations. Check the selected unit first, especially in the flexible comparison fields.

Why does changing a unit change the number?

The length stays the same while the size of the unit changes. A longer unit needs a smaller number of units to represent the same distance.

References

The light-year uses exactly 299792458 m/s times a 31557600-second Julian year, replacing the rounded reference factor. The parsec uses the IAU definition 648000/π astronomical units, with one astronomical unit exactly 149597870700 meters, instead of a rounded decimal factor. A million light-years uses exactly one million Julian light-years, consistently with the reviewed single light-year unit. A megaparsec uses exactly one million IAU-defined parsecs, consistently with the reviewed single parsec unit.

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