MCM
A million cubic metres (MCM, also cubic hectometre hm³) is the standard unit of reservoir storage in India’s Central Water Commission bulletins: the Bhakra reservoir holds about 9,340 MCM gross.
Symbol: MCM
Quantity: volume of stored or released water (reservoirs, river flows, allocations)
SI relation: MCM is the coherent SI unit of water volume.
Derivation: 1 MCM = 10⁶ m³ = 1 hm³ (cubic hectometre).
Exact: yes, by definition
Same quantity as gigalitre (GL) : the factor between them is exactly 1.
Typical uses
- CWC weekly reservoir storage bulletins
- Dam live and gross storage
- Basin water balance
Convert million cubic metres to other units
| Conversion | 1 MCM equals | Reverse |
|---|---|---|
| MCM to BCM | 0.001 BCM | BCM to MCM |
| MCM to TMC | 0.03531466672 TMC | TMC to MCM |
| MCM to acre-foot | 810.7131938 acre-ft | acre-foot to MCM |
| MCM to cubic metre | 1000000 m³ | cubic metre to MCM |
| MCM to Mcft | 35.31466672 Mcft | Mcft to MCM |
| MCM to MAF | 0.0008107131938 MAF | MAF to MCM |
| MCM to hectare-metre | 100 ha·m | hectare-metre to MCM |
| MCM to megalitre | 1000 ML | megalitre to MCM |
| MCM to cubic kilometre | 0.001 km³ | cubic kilometre to MCM |
| MCM to gigalitre | 1 GL | gigalitre to MCM |
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). MCM. Retrieved October 29, 2026, from https://scientificconverters.com/units/million-cubic-meters/
IEEE
Scientific Converters, "MCM," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/units/million-cubic-meters/