Cubic metric volume unit.
Cubic Megameters to Cubic Kilometers Converter — Mm3 to km3
Convert Cubic Megameter (Mm3) to Cubic Kilometer (km3) using the exact conversion factor (1 cubic megameter = 1,000,000,000 cubic kilometer). See the formula, worked examples, and conversion table.
Cubic Megameters 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+18 / 1e+9.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Cubic Megameters to Cubic Kilometers
Cubic Megameter 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 megameters × 1000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 cubic megameter equals 1e+18 base units, and 1 cubic kilometer equals 1000000000 base units, so dividing one by the other gives the direct cubic megameter-to-cubic kilometer factor of 1000000000.
Simple example
1 Mm3 × 1000000000 = 1,000,000,000 km3
1 cubic megameter = 1,000,000,000 cubic kilometers.
Real-world example
10 Mm3 × 1000000000 = 10,000,000,000 km3
10 cubic megameters = 10,000,000,000 cubic kilometers.
Conversion table
| Cubic Megameter (Mm3) | Cubic Kilometer (km3) |
|---|---|
| 1 Mm3 | 1,000,000,000 km3 |
| 5 Mm3 | 5,000,000,000 km3 |
| 10 Mm3 | 10,000,000,000 km3 |
| 25 Mm3 | 25,000,000,000 km3 |
| 50 Mm3 | 50,000,000,000 km3 |
| 100 Mm3 | 100,000,000,000 km3 |
Reverse conversion: Cubic Kilometer to Cubic Megameter
1 km3 × 1e-9 = 1e-9 Mm3
1 cubic kilometer = 1e-9 cubic megameters.
cubic megameters = cubic kilometers × 1e-9
For a page dedicated to this direction, see Cubic Kilometer to Cubic Megameter.
Understanding the Cubic Megameter (Mm3)
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 megameter?
1 cubic megameter equals 1,000,000,000 cubic kilometers, using the exact defined conversion factor rather than an estimate.
How do I convert cubic megameter to cubic kilometer?
Multiply the cubic megameter value by 1000000000. The converter above does this instantly to whatever precision you set.
How do I convert cubic kilometer back to cubic megameter?
Use the reverse factor: 1 cubic kilometer equals 1e-9 cubic megameters. You can also use the swap control in the converter above to flip the direction instantly.
What is a cubic megameter?
Cubic Megameter (Mm3) is a unit of volume.
What is a cubic kilometer?
Cubic Kilometer (km3) is a unit of volume.
Is the cubic megameter to cubic kilometer conversion exact?
Yes. Both cubic megameter and cubic kilometer are defined by fixed standards rather than physical artifacts, so the factor of 1000000000 used above is exact to as many digits as you choose to display.