Convert Cubic Kilometres to Acre-feet (km3 to acre-ft)
1 cubic kilometre (km³) = 810713.1938 acre-feet (acre-ft). 1 acre-ft = 0.000001233481838 km³. Example: 15 km³ = 15 × 810713.1938 = 12160697.91 acre-ft.
Also searched as cubic kilometres to acre-ft, cubic kilometres in acre-ft, cubic kilometres into acre-feet, km3 to acre-ft, km3 in acre-feet, km3 into acre-foot, cubic kilometre to acre-foot, km3 to acre-feet converter, cubic kilometers to acre-feet and how many acre-feet in a cubic kilometre.
1 km³ = 810713.1938 acre-ft
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk cubic kilometre to acre-foot converter to paste a column from Excel.
How to Convert Cubic Kilometre to Acre-foot
- 1 km³ = 810713.1938 acre-ft
- 1 acre-ft = 0.000001233481838 km³
- Example: convert 15 km³ to acre-ft: 15 km³ = 15 × 810713.1938 acre-ft = 12160697.91 acre-ft
Formula
acre-ft = km³ × 810713.1937899
Derivation from SI units:
- 1 km³ = 10⁹ m³ = 1 BCM.
- 1 acre-foot = 43,560 ft³ = 1233.48183754752 m³.
- 1 km³ = 1000 MCM ÷ 0.001233481837548 MCM per acre-ft = 810713.1937899 acre-ft
Both units are defined exactly, so the factor is exact. Cubic Kilometre definition: cubic kilometre; Acre-foot definition: acre-foot.
Worked examples
- A reading of 10 km³ converts to 8107131.938 acre-ft.
10 km³ × 810713.1938 = 8107131.938 acre-ft - A value of 500 km³ is 405356596.9 acre-ft.
500 km³ × 810713.1938 = 405356596.9 acre-ft
Cubic Kilometre to Acre-foot conversion table
| Cubic Kilometres (km³) | Acre-feet (acre-ft) |
|---|---|
| 0.1 km³ | 81071.31938 acre-ft |
| 1 km³ | 810713.1938 acre-ft |
| 5 km³ | 4053565.969 acre-ft |
| 10 km³ | 8107131.938 acre-ft |
| 50 km³ | 40535659.69 acre-ft |
| 100 km³ | 81071319.38 acre-ft |
| 500 km³ | 405356596.9 acre-ft |
| 1000 km³ | 810713193.8 acre-ft |
| 4000 km³ | 3242852775 acre-ft |
| 10000 km³ | 8107131938 acre-ft |
Where it's used
Cubic Kilometres are used for global water budgets, 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.
Cubic Kilometre to other water volume units
| Conversion | 1 km³ equals |
|---|---|
| cubic kilometre to acre-foot | 810713.1938 acre-ft |
| cubic kilometre to MCM | 1000 MCM |
| cubic kilometre to BCM | 1 BCM |
| cubic kilometre to TMC | 35.31466672 TMC |
| cubic kilometre to cubic metre | 1000000000 m³ |
| cubic kilometre to Mcft | 35314.66672 Mcft |
| cubic kilometre to MAF | 0.8107131938 MAF |
| cubic kilometre to hectare-metre | 100000 ha·m |
Show 2 more units
| cubic kilometre to megalitre | 1000000 ML |
|---|---|
| cubic kilometre to gigalitre | 1000 GL |
Frequently asked questions
How many acre-feet are in 1 cubic kilometre?
1 km³ = 810713.1938 acre-ft.
How do I convert cubic kilometres to acre-feet?
Multiply the value in km³ by 810713.1938. For example, 15 km³ × 810713.1938 = 12160697.91 acre-ft.
Is the km³ 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 Cubic Kilometres to Acre-feet (km3 to acre-ft). Retrieved October 29, 2026, from https://scientificconverters.com/water-volume/cubic-kilometers-to-acre-feet/
IEEE
Scientific Converters, "Convert Cubic Kilometres to Acre-feet (km3 to acre-ft)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/water-volume/cubic-kilometers-to-acre-feet/