Decimeter is 0.1 meter units.
Decimeters to Megameters Converter — dm to Mm
Convert Decimeter (dm) to Megameter (Mm) using the exact conversion factor (1 decimeter = 1e-7 megameter). See the formula, worked examples, and conversion table.
Decimeters to Megameters converter
Converter
Length Converter
Convert SI, imperial, US customary, astronomical, scientific, and historical length units.
Context values
Some unit families need one extra value for a physically accurate result.
Megameter is 1000000 meter units.
Result = input x 0.1 / 1e+6.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Decimeters to Megameters
Decimeter and Megameter both measure length. Specifically: Decimeter is 0.1 meter units, and megameter is 1000000 meter units.
Formula
megameters = decimeters × 1e-7
This factor comes from each unit's defined relationship to the category's base unit: 1 decimeter equals 0.1 base units, and 1 megameter equals 1000000 base units, so dividing one by the other gives the direct decimeter-to-megameter factor of 1e-7.
Simple example
1 dm × 1e-7 = 1e-7 Mm
1 decimeter = 1e-7 megameters.
Real-world example
10 dm × 1e-7 = 0.000001 Mm
10 decimeters = 0.000001 megameters.
Conversion table
| Decimeter (dm) | Megameter (Mm) |
|---|---|
| 1 dm | 1e-7 Mm |
| 5 dm | 5e-7 Mm |
| 10 dm | 0.000001 Mm |
| 21.0975 dm | 0.0000021098 Mm |
| 42.195 dm | 0.0000042195 Mm |
| 100 dm | 0.00001 Mm |
Reverse conversion: Megameter to Decimeter
1e-7 Mm × 10000000 = 1 dm
1e-7 megameters = 1 decimeters.
decimeters = megameters × 10000000
For a page dedicated to this direction, see Megameter to Decimeter.
Understanding the Decimeter (dm)
Decimeter is 0.1 meter units.
Understanding the Megameter (Mm)
Megameter is 1000000 meter units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many megameters are in 1 decimeter?
1 decimeter equals 1e-7 megameters, using the exact defined conversion factor rather than an estimate.
How do I convert decimeter to megameter?
Multiply the decimeter value by 1e-7. The converter above does this instantly to whatever precision you set.
How do I convert megameter back to decimeter?
Use the reverse factor: 1 megameter equals 10,000,000 decimeters. You can also use the swap control in the converter above to flip the direction instantly.
What is a decimeter?
Decimeter (dm) is a unit of length.
What is a megameter?
Megameter (Mm) is a unit of length.
Is the decimeter to megameter conversion exact?
Yes. Both decimeter and megameter are defined by fixed standards rather than physical artifacts, so the factor of 1e-7 used above is exact to as many digits as you choose to display.