Convert Cubic Metres to Cubic Kilometres (m3 to km3)
1 cubic metre (m³) = 1 × 10⁻⁹ cubic kilometres (km³). 1 km³ = 1000000000 m³. Example: 15 m³ = 15 × 1 × 10⁻⁹ = 1.5 × 10⁻⁸ km³.
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1 m³ = 1e-9 km³
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk cubic metre to cubic kilometre converter to paste a column from Excel.
How to Convert Cubic Metre to Cubic Kilometre
- 1 m³ = 1 × 10⁻⁹ km³
- 1 km³ = 1000000000 m³
- Example: convert 15 m³ to km³: 15 m³ = 15 × 1 × 10⁻⁹ km³ = 1.5 × 10⁻⁸ km³
Formula
km³ = m³ ÷ 1000000000
Derivation from SI units:
- 1 m³ = 10⁻⁶ MCM.
- 1 km³ = 10⁹ m³ = 1 BCM.
- 1 m³ = 0.000001 MCM ÷ 1000 MCM per km³ = 1 × 10⁻⁹ km³
Both units are defined exactly, so the factor is exact. Cubic Metre definition: cubic metre; Cubic Kilometre definition: cubic kilometre.
Worked examples
- A reading of 1000 m³ converts to 0.000001 km³.
1000 m³ × 1 × 10⁻⁹ = 0.000001 km³ - A value of 100000 m³ is 0.0001 km³.
100000 m³ × 1 × 10⁻⁹ = 0.0001 km³
Cubic Metre to Cubic Kilometre conversion table
| Cubic Metres (m³) | Cubic Kilometres (km³) |
|---|---|
| 1 m³ | 1 × 10⁻⁹ km³ |
| 10 m³ | 1 × 10⁻⁸ km³ |
| 100 m³ | 1 × 10⁻⁷ km³ |
| 1000 m³ | 0.000001 km³ |
| 10000 m³ | 0.00001 km³ |
| 86400 m³ | 0.0000864 km³ |
| 100000 m³ | 0.0001 km³ |
| 1000000 m³ | 0.001 km³ |
| 10000000 m³ | 0.01 km³ |
| 100000000 m³ | 0.1 km³ |
Where it's used
Cubic Metres are used for farm ponds, tanks and check-dam storage, while cubic kilometres appear in global water budgets. Both measure volume of stored or released water (reservoirs, river flows, allocations), so the conversion is a fixed factor.
Cubic Metre to other water volume units
| Conversion | 1 m³ equals |
|---|---|
| cubic metre to cubic kilometre | 1 × 10⁻⁹ km³ |
| cubic metre to MCM | 0.000001 MCM |
| cubic metre to BCM | 1 × 10⁻⁹ BCM |
| cubic metre to TMC | 3.531466672 × 10⁻⁸ TMC |
| cubic metre to acre-foot | 0.0008107131938 acre-ft |
| cubic metre to Mcft | 0.00003531466672 Mcft |
| cubic metre to MAF | 8.107131938 × 10⁻¹⁰ MAF |
| cubic metre to hectare-metre | 0.0001 ha·m |
Show 2 more units
| cubic metre to megalitre | 0.001 ML |
|---|---|
| cubic metre to gigalitre | 0.000001 GL |
Frequently asked questions
How many cubic kilometres are in 1 cubic metre?
1 m³ = 1 × 10⁻⁹ km³.
How do I convert cubic metres to cubic kilometres?
Multiply the value in m³ by 1 × 10⁻⁹, or divide it by 1000000000. For example, 15 m³ × 1 × 10⁻⁹ = 1.5 × 10⁻⁸ km³.
Is the m³ to km³ conversion exact?
Yes. Both units are defined exactly, and 1 m³ is exactly 1 × 10⁻⁹ km³.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (derived units) and Table 8 (non-SI units accepted for use with the SI).
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Cubic Metres to Cubic Kilometres (m3 to km3). Retrieved October 29, 2026, from https://scientificconverters.com/water-volume/cubic-meters-to-cubic-kilometers/
IEEE
Scientific Converters, "Convert Cubic Metres to Cubic Kilometres (m3 to km3)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/water-volume/cubic-meters-to-cubic-kilometers/