Cubic metric volume unit.
Cubic Gigameters to Cubic Kilometers Converter — Gm3 to km3
Convert Cubic Gigameter (Gm3) to Cubic Kilometer (km3) using the exact conversion factor (1 cubic gigameter = 1e+18 cubic kilometer). See the formula, worked examples, and conversion table.
Cubic Gigameters to Cubic Kilometers converter
Converter
Volume Converter
Convert metric, US customary, imperial, cooking, dry, and industrial volume units.
Context values
Some unit families need one extra value for a physically accurate result.
Cubic metric volume unit.
Result = input x 1e+27 / 1e+9.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Cubic Gigameters to Cubic Kilometers
Cubic Gigameter and Cubic Kilometer appear side by side at fuel pumps and on beverage labels, since the US measures liquids in gallons while most of the world uses liters. Both are cubic metric volume unit units.
Formula
cubic kilometers = cubic gigameters × 1e+18
This factor comes from each unit's defined relationship to the category's base unit: 1 cubic gigameter equals 1e+27 base units, and 1 cubic kilometer equals 1000000000 base units, so dividing one by the other gives the direct cubic gigameter-to-cubic kilometer factor of 1e+18.
Simple example
1 Gm3 × 1e+18 = 1e+18 km3
1 cubic gigameter = 1e+18 cubic kilometers.
Real-world example
10 Gm3 × 1e+18 = 1e+19 km3
10 cubic gigameters = 1e+19 cubic kilometers.
Conversion table
| Cubic Gigameter (Gm3) | Cubic Kilometer (km3) |
|---|---|
| 1 Gm3 | 1e+18 km3 |
| 5 Gm3 | 5e+18 km3 |
| 10 Gm3 | 1e+19 km3 |
| 25 Gm3 | 2.5e+19 km3 |
| 50 Gm3 | 5e+19 km3 |
| 100 Gm3 | 1e+20 km3 |
Reverse conversion: Cubic Kilometer to Cubic Gigameter
1e+18 km3 × 1e-18 = 1 Gm3
1e+18 cubic kilometers = 1 cubic gigameter.
cubic gigameters = cubic kilometers × 1e-18
For a page dedicated to this direction, see Cubic Kilometer to Cubic Gigameter.
Understanding the Cubic Gigameter (Gm3)
Cubic metric volume unit.
Understanding the Cubic Kilometer (km3)
Cubic metric volume unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many cubic kilometers are in 1 cubic gigameter?
1 cubic gigameter equals 1e+18 cubic kilometers, using the exact defined conversion factor rather than an estimate.
How do I convert cubic gigameter to cubic kilometer?
Multiply the cubic gigameter value by 1e+18. The converter above does this instantly to whatever precision you set.
How do I convert cubic kilometer back to cubic gigameter?
Use the reverse factor: 1 cubic kilometer equals 1e-18 cubic gigameters. You can also use the swap control in the converter above to flip the direction instantly.
What is a cubic gigameter?
Cubic Gigameter (Gm3) is a unit of volume.
What is a cubic kilometer?
Cubic Kilometer (km3) is a unit of volume.
Is the cubic gigameter to cubic kilometer conversion exact?
Yes. Both cubic gigameter and cubic kilometer are defined by fixed standards rather than physical artifacts, so the factor of 1e+18 used above is exact to as many digits as you choose to display.