Convert BCM to Cubic Kilometres (BCM to km3)
1 billion cubic metres (BCM) = 1 cubic kilometre (km³). 1 km³ = 1 BCM. Example: 15 BCM = 15 × 1 = 15 km³.
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1 BCM = 1 km³
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk BCM to cubic kilometre converter to paste a column from Excel.
How to Convert BCM to Cubic Kilometre
- 1 BCM = 1 km³
- 1 km³ = 1 BCM
- Example: convert 15 BCM to km³: 15 BCM = 15 × 1 km³ = 15 km³
Formula
km³ = BCM × 1
Derivation from SI units:
- 1 BCM = 10⁹ m³ = 1000 MCM = 1 km³.
- 1 km³ = 10⁹ m³ = 1 BCM.
- 1 BCM = 1000 MCM ÷ 1000 MCM per km³ = 1 km³
Both units are defined exactly, so the factor is exact. BCM definition: billion cubic metres; Cubic Kilometre definition: cubic kilometre.
Worked examples
- A reading of 2 BCM converts to 2 km³.
2 BCM × 1 = 2 km³ - A value of 30 BCM is 30 km³.
30 BCM × 1 = 30 km³
BCM to Cubic Kilometre conversion table
| BCM | Cubic Kilometres (km³) |
|---|---|
| 0.1 BCM | 0.1 km³ |
| 0.5 BCM | 0.5 km³ |
| 1 BCM | 1 km³ |
| 2 BCM | 2 km³ |
| 5 BCM | 5 km³ |
| 10 BCM | 10 km³ |
| 30 BCM | 30 km³ |
| 100 BCM | 100 km³ |
| 400 BCM | 400 km³ |
| 1000 BCM | 1000 km³ |
Where it's used
BCM are used for national water resources assessments, 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.
BCM to other water volume units
| Conversion | 1 BCM equals |
|---|---|
| BCM to cubic kilometre | 1 km³ |
| BCM to MCM | 1000 MCM |
| BCM to TMC | 35.31466672 TMC |
| BCM to acre-foot | 810713.1938 acre-ft |
| BCM to cubic metre | 1000000000 m³ |
| BCM to Mcft | 35314.66672 Mcft |
| BCM to MAF | 0.8107131938 MAF |
| BCM to hectare-metre | 100000 ha·m |
Show 2 more units
| BCM to megalitre | 1000000 ML |
|---|---|
| BCM to gigalitre | 1000 GL |
Frequently asked questions
How many cubic kilometres are in 1 billion cubic metres?
1 BCM = 1 km³.
How do I convert billion cubic metres to cubic kilometres?
Multiply the value in BCM by 1. For example, 15 BCM × 1 = 15 km³.
Is the BCM to km³ conversion exact?
Yes. Both units are defined exactly, and 1 BCM is exactly 1 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 BCM to Cubic Kilometres (BCM to km3). Retrieved October 29, 2026, from https://scientificconverters.com/water-volume/bcm-to-cubic-kilometers/
IEEE
Scientific Converters, "Convert BCM to Cubic Kilometres (BCM to km3)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/water-volume/bcm-to-cubic-kilometers/