Convert BCM to MAF
1 billion cubic metres (BCM) = 0.8107131938 million acre-feet (MAF). 1 MAF = 1.233481838 BCM. Example: 15 BCM = 15 × 0.8107131938 = 12.16069791 MAF.
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1 BCM = 0.8107131938 MAF
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk BCM to MAF converter to paste a column from Excel.
How to Convert BCM to MAF
- 1 BCM = 0.8107131938 MAF
- 1 MAF = 1.233481838 BCM
- Example: convert 15 BCM to MAF: 15 BCM = 15 × 0.8107131938 MAF = 12.16069791 MAF
Formula
MAF = BCM × 0.8107131937899
or MAF = BCM ÷ 1.233481837548
Derivation from SI units:
- 1 BCM = 10⁹ m³ = 1000 MCM = 1 km³.
- 1 MAF = 10⁶ acre-feet = 1233.48 MCM.
- 1 BCM = 1000 MCM ÷ 1233.481837548 MCM per MAF = 0.8107131937899 MAF
Both units are defined exactly, so the factor is exact. BCM definition: billion cubic metres; MAF definition: million acre-feet.
Worked examples
- A reading of 2 BCM converts to 1.621426388 MAF.
2 BCM × 0.8107131938 = 1.621426388 MAF - A value of 30 BCM is 24.32139581 MAF.
30 BCM × 0.8107131938 = 24.32139581 MAF
BCM to MAF conversion table
| BCM | MAF |
|---|---|
| 0.1 BCM | 0.08107131938 MAF |
| 0.5 BCM | 0.4053565969 MAF |
| 1 BCM | 0.8107131938 MAF |
| 2 BCM | 1.621426388 MAF |
| 5 BCM | 4.053565969 MAF |
| 10 BCM | 8.107131938 MAF |
| 30 BCM | 24.32139581 MAF |
| 100 BCM | 81.07131938 MAF |
| 400 BCM | 324.2852775 MAF |
| 1000 BCM | 810.7131938 MAF |
Where it's used
BCM are used for national water resources assessments, while million acre-feet appear in indus Waters Treaty and Pakistan IRSA accounts. 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 MAF | 0.8107131938 MAF |
| BCM to MCM | 1000 MCM |
| BCM to TMC | 35.31466672 TMC |
| BCM to acre-foot | 810713.1938 acre-ft |
| BCM to cubic metre | 1000000000 m³ |
| BCM to Mcft | 35314.66672 Mcft |
| 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 million acre-feet are in 1 billion cubic metres?
1 BCM = 0.8107131938 MAF.
How do I convert billion cubic metres to million acre-feet?
Multiply the value in BCM by 0.8107131938, or divide it by 1.233481838. For example, 15 BCM × 0.8107131938 = 12.16069791 MAF.
Is the BCM to MAF 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 MAF. Retrieved October 29, 2026, from https://scientificconverters.com/water-volume/bcm-to-maf/
IEEE
Scientific Converters, "Convert BCM to MAF," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/water-volume/bcm-to-maf/