Instant · Precise · Universal
32 units available
6 categories total
To convert Gm to km: multiply by 1,000,000. To convert Gm to AU: divide by 149.598.
1 Gm = 10⁹ m = 10⁶ km = 0.00668 AU.
For example, 1 Gigameter (Gm) = 1.000000e-9 Exameter (Em).
| Gigameter (Gm) | Exameter (Em) |
|---|---|
| 0.1 | 1.000000e-10 |
| 0.5 | 5.000000e-10 |
| 1 | 1.000000e-9 |
| 2 | 2.000000e-9 |
| 5 | 5.000000e-9 |
| 10 | 1.000000e-8 |
| 25 | 2.500000e-8 |
| 50 | 5.000000e-8 |
| 100 | 1.000000e-7 |
| 500 | 5.000000e-7 |
| 1000 | 0.000001 |
The gigameter is a unit of length equal to 10⁹ meters, or one billion meters (one million kilometers).
1 Gm = 10⁹ m = 10⁶ km = 0.00668 AU.
To convert Gm to km: multiply by 1,000,000. To convert Gm to AU: divide by 149.598.
Describing distances between planets in a compact metric format, though AU is preferred.
Light travels about 0.3 Gm per second (299,792 km/s ≈ 0.3 Gm/s).
Mixing up Gm with Gb (gigabyte) in mixed technical contexts. Context matters for the prefix 'giga'.
The Sun is ~150 Gm away from Earth — this is a useful anchor for the gigameter scale.
The exameter is a unit of length equal to 10¹⁸ meters, or about 105.7 light-years.
1 Em = 10¹⁸ m = 1,000 Pm ≈ 105.7 light-years ≈ 32.4 parsecs.
To convert Em to light-years: multiply by 105.7. To convert Em to parsecs: multiply by 32.4.
No practical applications. Theoretical framework for expressing galactic neighborhood distances.
The Milky Way galaxy has a diameter of about 10 Em (100,000 light-years).
Em is almost never used — astronomers use parsecs or light-years. It exists only for SI completeness.
Just remember: Exa = 10¹⁸. The Milky Way is about 10 Em across for a sense of scale.



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