Free · Length conversions

Decimeter Length Comparison Table

Translate decimeters into metric, customary and astronomical length units with editable comparison fields.

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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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Formula and method

10 dm equals one meter, 100 cm or 1,000 mm. A decimeter is one tenth of a meter, making it ten times a centimeter.

Meters = decimeters ÷ 10; centimeters = decimeters × 10

Worked example

Enter these known values and leave the other values blank.

Decimeters
10 dm
Millimeters
1000 mm
Centimeters
100 cm
Meters
1 m
Kilometers
0.001 km
Other metric units
0.01 hm
Inches
39.37 in
Feet
3.281 ft
Yards
1.0936 yd
Other imperial/US units
0.0006214 mi
Nautical miles
0.00054 nmi
Sun radii
1.4374e-9 R☉ (nominal)
Light years
1.057e-16 ly
Others
6.685e-12 au

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

Is a decimeter the same as a decameter?

No. Deci means one tenth, while deca means ten. One decameter equals 100 decimeters.

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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