Convert Cubic Kilometres to Cubic Metres (km3 to m3)
1 cubic kilometre (km³) = 1000000000 cubic metres (m³). 1 m³ = 1 × 10⁻⁹ km³. Example: 15 km³ = 15 × 1000000000 = 15000000000 m³.
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1 km³ = 1000000000 m³
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk cubic kilometre to cubic metre converter to paste a column from Excel.
How to Convert Cubic Kilometre to Cubic Metre
- 1 km³ = 1000000000 m³
- 1 m³ = 1 × 10⁻⁹ km³
- Example: convert 15 km³ to m³: 15 km³ = 15 × 1000000000 m³ = 15000000000 m³
Formula
m³ = km³ × 1000000000
Derivation from SI units:
- 1 km³ = 10⁹ m³ = 1 BCM.
- 1 m³ = 10⁻⁶ MCM.
- 1 km³ = 1000 MCM ÷ 0.000001 MCM per m³ = 1000000000 m³
Both units are defined exactly, so the factor is exact. Cubic Kilometre definition: cubic kilometre; Cubic Metre definition: cubic metre.
Worked examples
- A reading of 10 km³ converts to 10000000000 m³.
10 km³ × 1000000000 = 10000000000 m³ - A value of 500 km³ is 500000000000 m³.
500 km³ × 1000000000 = 500000000000 m³
Cubic Kilometre to Cubic Metre conversion table
| Cubic Kilometres (km³) | Cubic Metres (m³) |
|---|---|
| 0.1 km³ | 100000000 m³ |
| 1 km³ | 1000000000 m³ |
| 5 km³ | 5000000000 m³ |
| 10 km³ | 10000000000 m³ |
| 50 km³ | 50000000000 m³ |
| 100 km³ | 100000000000 m³ |
| 500 km³ | 500000000000 m³ |
| 1000 km³ | 1000000000000 m³ |
| 4000 km³ | 4000000000000 m³ |
| 10000 km³ | 10000000000000 m³ |
Where it's used
Cubic Kilometres are used for global water budgets, while cubic metres appear in farm ponds, tanks and check-dam storage. Both measure volume of stored or released water (reservoirs, river flows, allocations), so the conversion is a fixed factor.
Cubic Kilometre to other water volume units
| Conversion | 1 km³ equals |
|---|---|
| cubic kilometre to cubic metre | 1000000000 m³ |
| cubic kilometre to MCM | 1000 MCM |
| cubic kilometre to BCM | 1 BCM |
| cubic kilometre to TMC | 35.31466672 TMC |
| cubic kilometre to acre-foot | 810713.1938 acre-ft |
| cubic kilometre to Mcft | 35314.66672 Mcft |
| cubic kilometre to MAF | 0.8107131938 MAF |
| cubic kilometre to hectare-metre | 100000 ha·m |
Show 2 more units
| cubic kilometre to megalitre | 1000000 ML |
|---|---|
| cubic kilometre to gigalitre | 1000 GL |
Frequently asked questions
How many cubic metres are in 1 cubic kilometre?
1 km³ = 1000000000 m³.
How do I convert cubic kilometres to cubic metres?
Multiply the value in km³ by 1000000000. For example, 15 km³ × 1000000000 = 15000000000 m³.
Is the km³ to m³ conversion exact?
Yes. Both units are defined exactly, and 1 km³ is exactly 1000000000 m³.
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 Kilometres to Cubic Metres (km3 to m3). Retrieved October 29, 2026, from https://scientificconverters.com/water-volume/cubic-kilometers-to-cubic-meters/
IEEE
Scientific Converters, "Convert Cubic Kilometres to Cubic Metres (km3 to m3)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/water-volume/cubic-kilometers-to-cubic-meters/