Convert Acre-feet to Cubic Kilometres (acre-ft to km3)
1 acre-foot (acre-ft) = 0.000001233481838 cubic kilometres (km³). 1 km³ = 810713.1938 acre-ft. Example: 15 acre-ft = 15 × 0.000001233481838 = 0.00001850222756 km³.
Also searched as acre-feet to km3, acre-feet in km3, acre-feet into cubic kilometres, acre-ft to km3, acre-ft in cubic kilometres, acre-ft into cubic kilometre, acre-foot to cubic kilometre, acre-ft to cubic kilometres converter, acre-feet to cubic kilometers and how many cubic kilometres in an acre-foot.
1 acre-ft = 0.000001233481838 km³
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk acre-foot to cubic kilometre converter to paste a column from Excel.
How to Convert Acre-foot to Cubic Kilometre
- 1 acre-ft = 0.000001233481838 km³
- 1 km³ = 810713.1938 acre-ft
- Example: convert 15 acre-ft to km³: 15 acre-ft = 15 × 0.000001233481838 km³ = 0.00001850222756 km³
Formula
km³ = acre-ft × 0.000001233481837548
or km³ = acre-ft ÷ 810713.1937899
Derivation from SI units:
- 1 acre-foot = 43,560 ft³ = 1233.48183754752 m³.
- 1 km³ = 10⁹ m³ = 1 BCM.
- 1 acre-ft = 0.001233481837548 MCM ÷ 1000 MCM per km³ = 0.000001233481837548 km³
Both units are defined exactly, so the factor is exact. Acre-foot definition: acre-foot; Cubic Kilometre definition: cubic kilometre.
Worked examples
- A reading of 1000 acre-ft converts to 0.001233481838 km³.
1000 acre-ft × 0.000001233481838 = 0.001233481838 km³ - A value of 500000 acre-ft is 0.6167409188 km³.
500000 acre-ft × 0.000001233481838 = 0.6167409188 km³
Acre-foot to Cubic Kilometre conversion table
| Acre-feet (acre-ft) | Cubic Kilometres (km³) |
|---|---|
| 1 acre-ft | 0.000001233481838 km³ |
| 10 acre-ft | 0.00001233481838 km³ |
| 100 acre-ft | 0.0001233481838 km³ |
| 1000 acre-ft | 0.001233481838 km³ |
| 10000 acre-ft | 0.01233481838 km³ |
| 100000 acre-ft | 0.1233481838 km³ |
| 500000 acre-ft | 0.6167409188 km³ |
| 1000000 acre-ft | 1.233481838 km³ |
| 5000000 acre-ft | 6.167409188 km³ |
| 26000000 acre-ft | 32.07052778 km³ |
Where it's used
Acre-feet are used for US reservoir capacity and water rights, while cubic kilometres appear in global water budgets. 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 cubic kilometre | 0.000001233481838 km³ |
| 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 |
Show 2 more units
| acre-foot to megalitre | 1.233481838 ML |
|---|---|
| acre-foot to gigalitre | 0.001233481838 GL |
Frequently asked questions
How many cubic kilometres are in 1 acre-foot?
1 acre-ft = 0.000001233481838 km³.
How do I convert acre-feet to cubic kilometres?
Multiply the value in acre-ft by 0.000001233481838, or divide it by 810713.1938. For example, 15 acre-ft × 0.000001233481838 = 0.00001850222756 km³.
Is the acre-ft to km³ 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 Cubic Kilometres (acre-ft to km3). Retrieved October 29, 2026, from https://scientificconverters.com/water-volume/acre-feet-to-cubic-kilometers/
IEEE
Scientific Converters, "Convert Acre-feet to Cubic Kilometres (acre-ft to km3)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/water-volume/acre-feet-to-cubic-kilometers/