Convert BCM to MCM
1 billion cubic metres (BCM) = 1000 million cubic metres (MCM). 1 MCM = 0.001 BCM. Example: 15 BCM = 15 × 1000 = 15000 MCM.
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1 BCM = 1000 MCM
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk BCM to MCM converter to paste a column from Excel.
How to Convert BCM to MCM
- 1 BCM = 1000 MCM
- 1 MCM = 0.001 BCM
- Example: convert 15 BCM to MCM: 15 BCM = 15 × 1000 MCM = 15000 MCM
Formula
MCM = BCM × 1000
Derivation from SI units:
- 1 BCM = 10⁹ m³ = 1000 MCM = 1 km³.
- 1 MCM = 10⁶ m³ = 1 hm³ (cubic hectometre).
Both units are defined exactly, so the factor is exact. BCM definition: billion cubic metres; MCM definition: million cubic metres.
Worked examples
- A reading of 2 BCM converts to 2000 MCM.
2 BCM × 1000 = 2000 MCM - A value of 30 BCM is 30000 MCM.
30 BCM × 1000 = 30000 MCM
BCM to MCM conversion table
| BCM | MCM |
|---|---|
| 0.1 BCM | 100 MCM |
| 0.5 BCM | 500 MCM |
| 1 BCM | 1000 MCM |
| 2 BCM | 2000 MCM |
| 5 BCM | 5000 MCM |
| 10 BCM | 10000 MCM |
| 30 BCM | 30000 MCM |
| 100 BCM | 100000 MCM |
| 400 BCM | 400000 MCM |
| 1000 BCM | 1000000 MCM |
Where it's used
BCM are used for national water resources assessments, while million cubic metres appear in CWC weekly reservoir storage bulletins. 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 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 |
| BCM to megalitre | 1000000 ML |
Show 2 more units
| BCM to cubic kilometre | 1 km³ |
|---|---|
| BCM to gigalitre | 1000 GL |
Frequently asked questions
How many million cubic metres are in 1 billion cubic metres?
1 BCM = 1000 MCM.
How do I convert billion cubic metres to million cubic metres?
Multiply the value in BCM by 1000. For example, 15 BCM × 1000 = 15000 MCM.
Is the BCM to MCM conversion exact?
Yes. Both units are defined exactly, and 1 BCM is exactly 1000 MCM.
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 MCM. Retrieved October 29, 2026, from https://scientificconverters.com/water-volume/bcm-to-mcm/
IEEE
Scientific Converters, "Convert BCM to MCM," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/water-volume/bcm-to-mcm/