BCM
A billion cubic metres (BCM), equal to one cubic kilometre, measures river flows and national water resources: India’s utilisable surface water is about 690 BCM a year.
Symbol: BCM
Quantity: volume of stored or released water (reservoirs, river flows, allocations)
SI relation: 1 BCM = 1000 MCM (exact)
Derivation: 1 BCM = 10⁹ m³ = 1000 MCM = 1 km³.
Exact: yes, by definition
Same quantity as cubic kilometre (km³) : the factor between them is exactly 1.
Typical uses
- National water resources assessments
- River basin yields
- Groundwater recharge estimates
Convert billion cubic metres to other units
| Conversion | 1 BCM equals | Reverse |
|---|---|---|
| BCM to MCM | 1000 MCM | MCM to BCM |
| BCM to TMC | 35.31466672 TMC | TMC to BCM |
| BCM to acre-foot | 810713.1938 acre-ft | acre-foot to BCM |
| BCM to cubic metre | 1000000000 m³ | cubic metre to BCM |
| BCM to Mcft | 35314.66672 Mcft | Mcft to BCM |
| BCM to MAF | 0.8107131938 MAF | MAF to BCM |
| BCM to hectare-metre | 100000 ha·m | hectare-metre to BCM |
| BCM to megalitre | 1000000 ML | megalitre to BCM |
| BCM to cubic kilometre | 1 km³ | cubic kilometre to BCM |
| BCM to gigalitre | 1000 GL | gigalitre to BCM |
Open the Water Volume Converter (TMC, MCM, Acre-foot) to convert any value between all units.
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). BCM. Retrieved October 29, 2026, from https://scientificconverters.com/units/billion-cubic-meters/
IEEE
Scientific Converters, "BCM," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/units/billion-cubic-meters/