Convert BCM to Acre-feet (BCM to acre-ft)
1 billion cubic metres (BCM) = 810713.1938 acre-feet (acre-ft). 1 acre-ft = 0.000001233481838 BCM. Example: 15 BCM = 15 × 810713.1938 = 12160697.91 acre-ft.
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1 BCM = 810713.1938 acre-ft
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk BCM to acre-foot converter to paste a column from Excel.
How to Convert BCM to Acre-foot
- 1 BCM = 810713.1938 acre-ft
- 1 acre-ft = 0.000001233481838 BCM
- Example: convert 15 BCM to acre-ft: 15 BCM = 15 × 810713.1938 acre-ft = 12160697.91 acre-ft
Formula
acre-ft = BCM × 810713.1937899
Derivation from SI units:
- 1 BCM = 10⁹ m³ = 1000 MCM = 1 km³.
- 1 acre-foot = 43,560 ft³ = 1233.48183754752 m³.
- 1 BCM = 1000 MCM ÷ 0.001233481837548 MCM per acre-ft = 810713.1937899 acre-ft
Both units are defined exactly, so the factor is exact. BCM definition: billion cubic metres; Acre-foot definition: acre-foot.
Worked examples
- A reading of 2 BCM converts to 1621426.388 acre-ft.
2 BCM × 810713.1938 = 1621426.388 acre-ft - A value of 30 BCM is 24321395.81 acre-ft.
30 BCM × 810713.1938 = 24321395.81 acre-ft
BCM to Acre-foot conversion table
| BCM | Acre-feet (acre-ft) |
|---|---|
| 0.1 BCM | 81071.31938 acre-ft |
| 0.5 BCM | 405356.5969 acre-ft |
| 1 BCM | 810713.1938 acre-ft |
| 2 BCM | 1621426.388 acre-ft |
| 5 BCM | 4053565.969 acre-ft |
| 10 BCM | 8107131.938 acre-ft |
| 30 BCM | 24321395.81 acre-ft |
| 100 BCM | 81071319.38 acre-ft |
| 400 BCM | 324285277.5 acre-ft |
| 1000 BCM | 810713193.8 acre-ft |
Where it's used
BCM are used for national water resources assessments, 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.
BCM to other water volume units
| Conversion | 1 BCM equals |
|---|---|
| BCM to acre-foot | 810713.1938 acre-ft |
| BCM to MCM | 1000 MCM |
| BCM to TMC | 35.31466672 TMC |
| BCM to cubic metre | 1000000000 m³ |
| BCM to Mcft | 35314.66672 Mcft |
| BCM to MAF | 0.8107131938 MAF |
| BCM to hectare-metre | 100000 ha·m |
| BCM to megalitre | 1000000 ML |
Show 2 more units
| BCM to cubic kilometre | 1 km³ |
|---|---|
| BCM to gigalitre | 1000 GL |
Frequently asked questions
How many acre-feet are in 1 billion cubic metres?
1 BCM = 810713.1938 acre-ft.
How do I convert billion cubic metres to acre-feet?
Multiply the value in BCM by 810713.1938. For example, 15 BCM × 810713.1938 = 12160697.91 acre-ft.
Is the BCM 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 BCM to Acre-feet (BCM to acre-ft). Retrieved October 29, 2026, from https://scientificconverters.com/water-volume/bcm-to-acre-feet/
IEEE
Scientific Converters, "Convert BCM to Acre-feet (BCM to acre-ft)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/water-volume/bcm-to-acre-feet/