Convert Acre-feet to MCM (acre-ft to MCM)
1 acre-foot (acre-ft) = 0.001233481838 million cubic metres (MCM). 1 MCM = 810.7131938 acre-ft. Example: 15 acre-ft = 15 × 0.001233481838 = 0.01850222756 MCM.
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1 acre-ft = 0.001233481838 MCM
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk acre-foot to MCM converter to paste a column from Excel.
How to Convert Acre-foot to MCM
- 1 acre-ft = 0.001233481838 MCM
- 1 MCM = 810.7131938 acre-ft
- Example: convert 15 acre-ft to MCM: 15 acre-ft = 15 × 0.001233481838 MCM = 0.01850222756 MCM
Formula
MCM = acre-ft × 0.001233481837548
or MCM = acre-ft ÷ 810.7131937899
Derivation from SI units:
- 1 acre-foot = 43,560 ft³ = 1233.48183754752 m³.
- 1 MCM = 10⁶ m³ = 1 hm³ (cubic hectometre).
Both units are defined exactly, so the factor is exact. Acre-foot definition: acre-foot; MCM definition: million cubic metres.
Worked examples
- A reading of 1000 acre-ft converts to 1.233481838 MCM.
1000 acre-ft × 0.001233481838 = 1.233481838 MCM - A value of 500000 acre-ft is 616.7409188 MCM.
500000 acre-ft × 0.001233481838 = 616.7409188 MCM
Acre-foot to MCM conversion table
| Acre-feet (acre-ft) | MCM |
|---|---|
| 1 acre-ft | 0.001233481838 MCM |
| 10 acre-ft | 0.01233481838 MCM |
| 100 acre-ft | 0.1233481838 MCM |
| 1000 acre-ft | 1.233481838 MCM |
| 10000 acre-ft | 12.33481838 MCM |
| 100000 acre-ft | 123.3481838 MCM |
| 500000 acre-ft | 616.7409188 MCM |
| 1000000 acre-ft | 1233.481838 MCM |
| 5000000 acre-ft | 6167.409188 MCM |
| 26000000 acre-ft | 32070.52778 MCM |
Where it's used
Acre-feet are used for US reservoir capacity and water rights, 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.
Acre-foot to other water volume units
| Conversion | 1 acre-ft equals |
|---|---|
| acre-foot to MCM | 0.001233481838 MCM |
| acre-foot to BCM | 0.000001233481838 BCM |
| acre-foot to TMC | 0.00004356 TMC |
| acre-foot to cubic metre | 1233.481838 m³ |
| acre-foot to Mcft | 0.04356 Mcft |
| acre-foot to MAF | 0.000001 MAF |
| acre-foot to hectare-metre | 0.1233481838 ha·m |
| acre-foot to megalitre | 1.233481838 ML |
Show 2 more units
| acre-foot to cubic kilometre | 0.000001233481838 km³ |
|---|---|
| acre-foot to gigalitre | 0.001233481838 GL |
Frequently asked questions
How many million cubic metres are in 1 acre-foot?
1 acre-ft = 0.001233481838 MCM.
How do I convert acre-feet to million cubic metres?
Multiply the value in acre-ft by 0.001233481838, or divide it by 810.7131938. For example, 15 acre-ft × 0.001233481838 = 0.01850222756 MCM.
Is the acre-ft to MCM 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
- 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".
- 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 Acre-feet to MCM (acre-ft to MCM). Retrieved October 29, 2026, from https://scientificconverters.com/water-volume/acre-feet-to-mcm/
IEEE
Scientific Converters, "Convert Acre-feet to MCM (acre-ft to MCM)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/water-volume/acre-feet-to-mcm/