Gigameter is 1000000000 meter units.
Gigameters to Megameters Converter — Gm to Mm
Convert Gigameter (Gm) to Megameter (Mm) using the exact conversion factor (1 gigameter = 1,000 megameter). See the formula, worked examples, and conversion table.
Gigameters 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 1e+9 / 1e+6.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Gigameters to Megameters
Gigameter and Megameter both measure length. Specifically: Gigameter is 1000000000 meter units, and megameter is 1000000 meter units.
Formula
megameters = gigameters × 1000
This factor comes from each unit's defined relationship to the category's base unit: 1 gigameter equals 1000000000 base units, and 1 megameter equals 1000000 base units, so dividing one by the other gives the direct gigameter-to-megameter factor of 1000.
Simple example
1 Gm × 1000 = 1,000 Mm
1 gigameter = 1,000 megameters.
Real-world example
10 Gm × 1000 = 10,000 Mm
10 gigameters = 10,000 megameters.
Conversion table
| Gigameter (Gm) | Megameter (Mm) |
|---|---|
| 1 Gm | 1,000 Mm |
| 5 Gm | 5,000 Mm |
| 10 Gm | 10,000 Mm |
| 21.0975 Gm | 21,097.5 Mm |
| 42.195 Gm | 42,195 Mm |
| 100 Gm | 100,000 Mm |
Reverse conversion: Megameter to Gigameter
1 Mm × 0.001 = 0.001 Gm
1 megameter = 0.001 gigameters.
gigameters = megameters × 0.001
For a page dedicated to this direction, see Megameter to Gigameter.
Understanding the Gigameter (Gm)
Gigameter is 1000000000 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 gigameter?
1 gigameter equals 1,000 megameters, using the exact defined conversion factor rather than an estimate.
How do I convert gigameter to megameter?
Multiply the gigameter value by 1000. The converter above does this instantly to whatever precision you set.
How do I convert megameter back to gigameter?
Use the reverse factor: 1 megameter equals 0.001 gigameters. You can also use the swap control in the converter above to flip the direction instantly.
What is a gigameter?
Gigameter (Gm) is a unit of length.
What is a megameter?
Megameter (Mm) is a unit of length.
Is the gigameter to megameter conversion exact?
Yes. Both gigameter and megameter are defined by fixed standards rather than physical artifacts, so the factor of 1000 used above is exact to as many digits as you choose to display.