Convert MCM to Acre-feet (MCM to acre-ft)
1 million cubic metres (MCM) = 810.7131938 acre-feet (acre-ft). 1 acre-ft = 0.001233481838 MCM. Example: 15 MCM = 15 × 810.7131938 = 12160.69791 acre-ft.
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1 MCM = 810.7131938 acre-ft
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk MCM to acre-foot converter to paste a column from Excel.
How to Convert MCM to Acre-foot
- 1 MCM = 810.7131938 acre-ft
- 1 acre-ft = 0.001233481838 MCM
- Example: convert 15 MCM to acre-ft: 15 MCM = 15 × 810.7131938 acre-ft = 12160.69791 acre-ft
Formula
acre-ft = MCM × 810.7131937899
Derivation from SI units:
- 1 MCM = 10⁶ m³ = 1 hm³ (cubic hectometre).
- 1 acre-foot = 43,560 ft³ = 1233.48183754752 m³.
Both units are defined exactly, so the factor is exact. MCM definition: million cubic metres; Acre-foot definition: acre-foot.
Worked examples
- A reading of 5 MCM converts to 4053.565969 acre-ft.
5 MCM × 810.7131938 = 4053.565969 acre-ft - A value of 100 MCM is 81071.31938 acre-ft.
100 MCM × 810.7131938 = 81071.31938 acre-ft
MCM to Acre-foot conversion table
| MCM | Acre-feet (acre-ft) |
|---|---|
| 0.1 MCM | 81.07131938 acre-ft |
| 0.5 MCM | 405.3565969 acre-ft |
| 1 MCM | 810.7131938 acre-ft |
| 5 MCM | 4053.565969 acre-ft |
| 10 MCM | 8107.131938 acre-ft |
| 50 MCM | 40535.65969 acre-ft |
| 100 MCM | 81071.31938 acre-ft |
| 500 MCM | 405356.5969 acre-ft |
| 1000 MCM | 810713.1938 acre-ft |
| 10000 MCM | 8107131.938 acre-ft |
Where it's used
MCM are used for CWC weekly reservoir storage bulletins, while acre-feet appear in US reservoir capacity and water rights. Both measure volume of stored or released water (reservoirs, river flows, allocations), so the conversion is a fixed factor.
MCM to other water volume units
| Conversion | 1 MCM equals |
|---|---|
| MCM to acre-foot | 810.7131938 acre-ft |
| MCM to BCM | 0.001 BCM |
| MCM to TMC | 0.03531466672 TMC |
| MCM to cubic metre | 1000000 m³ |
| MCM to Mcft | 35.31466672 Mcft |
| MCM to MAF | 0.0008107131938 MAF |
| MCM to hectare-metre | 100 ha·m |
| MCM to megalitre | 1000 ML |
Show 2 more units
| MCM to cubic kilometre | 0.001 km³ |
|---|---|
| MCM to gigalitre | 1 GL |
Frequently asked questions
How many acre-feet are in 1 million cubic metres?
1 MCM = 810.7131938 acre-ft.
How do I convert million cubic metres to acre-feet?
Multiply the value in MCM by 810.7131938. For example, 15 MCM × 810.7131938 = 12160.69791 acre-ft.
Is the MCM to acre-ft conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
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).
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "acre-foot".
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 MCM to Acre-feet (MCM to acre-ft). Retrieved October 29, 2026, from https://scientificconverters.com/water-volume/mcm-to-acre-feet/
IEEE
Scientific Converters, "Convert MCM to Acre-feet (MCM to acre-ft)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/water-volume/mcm-to-acre-feet/