Convert Cubic Metres to MCM (m3 to MCM)
1 cubic metre (m³) = 0.000001 million cubic metres (MCM). 1 MCM = 1000000 m³. Example: 15 m³ = 15 × 0.000001 = 0.000015 MCM.
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1 m³ = 0.000001 MCM
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk cubic metre to MCM converter to paste a column from Excel.
How to Convert Cubic Metre to MCM
- 1 m³ = 0.000001 MCM
- 1 MCM = 1000000 m³
- Example: convert 15 m³ to MCM: 15 m³ = 15 × 0.000001 MCM = 0.000015 MCM
Formula
MCM = m³ ÷ 1000000
Derivation from SI units:
- 1 m³ = 10⁻⁶ MCM.
- 1 MCM = 10⁶ m³ = 1 hm³ (cubic hectometre).
Both units are defined exactly, so the factor is exact. Cubic Metre definition: cubic metre; MCM definition: million cubic metres.
Worked examples
- A reading of 1000 m³ converts to 0.001 MCM.
1000 m³ × 0.000001 = 0.001 MCM - A value of 100000 m³ is 0.1 MCM.
100000 m³ × 0.000001 = 0.1 MCM
Cubic Metre to MCM conversion table
| Cubic Metres (m³) | MCM |
|---|---|
| 1 m³ | 0.000001 MCM |
| 10 m³ | 0.00001 MCM |
| 100 m³ | 0.0001 MCM |
| 1000 m³ | 0.001 MCM |
| 10000 m³ | 0.01 MCM |
| 86400 m³ | 0.0864 MCM |
| 100000 m³ | 0.1 MCM |
| 1000000 m³ | 1 MCM |
| 10000000 m³ | 10 MCM |
| 100000000 m³ | 100 MCM |
Where it's used
Cubic Metres are used for farm ponds, tanks and check-dam storage, 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.
Cubic Metre to other water volume units
| Conversion | 1 m³ equals |
|---|---|
| cubic metre to MCM | 0.000001 MCM |
| cubic metre to BCM | 1 × 10⁻⁹ BCM |
| cubic metre to TMC | 3.531466672 × 10⁻⁸ TMC |
| cubic metre to acre-foot | 0.0008107131938 acre-ft |
| cubic metre to Mcft | 0.00003531466672 Mcft |
| cubic metre to MAF | 8.107131938 × 10⁻¹⁰ MAF |
| cubic metre to hectare-metre | 0.0001 ha·m |
| cubic metre to megalitre | 0.001 ML |
Show 2 more units
| cubic metre to cubic kilometre | 1 × 10⁻⁹ km³ |
|---|---|
| cubic metre to gigalitre | 0.000001 GL |
Frequently asked questions
How many million cubic metres are in 1 cubic metre?
1 m³ = 0.000001 MCM.
How do I convert cubic metres to million cubic metres?
Multiply the value in m³ by 0.000001, or divide it by 1000000. For example, 15 m³ × 0.000001 = 0.000015 MCM.
Is the m³ to MCM conversion exact?
Yes. Both units are defined exactly, and 1 m³ is exactly 0.000001 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 Cubic Metres to MCM (m3 to MCM). Retrieved October 29, 2026, from https://scientificconverters.com/water-volume/cubic-meters-to-mcm/
IEEE
Scientific Converters, "Convert Cubic Metres to MCM (m3 to MCM)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/water-volume/cubic-meters-to-mcm/