Convert Cubic Foot to Acre-Foot
Convert cubic feet to acre-feet instantly. 1 cubic foot = 2.295684e-5 acre-foot — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Acre-Foot to Cubic Foot converter for the reverse conversion.
Units explained
Cubic Foot
A cubic foot is the volume of a cube one foot on a side (28.3168 L).
Derived by cubing the international foot (0.3048 m).
Used for natural gas, refrigerators, shipping and HVAC.
1959 yard agreement.
Acre-Foot
An acre-foot is the volume covering one acre to a depth of one foot (1,233.48 m³).
Combines the acre and the foot for large water volumes.
The standard US unit for reservoir and irrigation water.
US water management.
Cubic Foot to Acre-Foot conversion formula
The relationship between cubic feet and acre-feet:
To convert cubic feet to acre-feet, multiply the value in cubic feet by 2.295684e-5. To reverse, multiply acre-feet by 43560.
How to use this converter
Type a value into the calculator. The result in acre-feet updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Acre-Foot to Cubic Foot converter for the reverse direction.
Step-by-step: convert cubic feet to acre-feet
- Write down the value in cubic feet (ft³).
- Multiply that value by the factor 2.295684e-5.
- The product is the equivalent value in acre-feet (ac·ft).
- To reverse, multiply the acre-foot value by 43560.
Worked examples
Example 1 — Convert 1 ft³ to ac·ft:
1 × 2.295684e-5 = 2.295684e-5 ac·ft
Example 2 — Convert 100 ft³ to ac·ft:
100 × 2.295684e-5 = 0.0022956841 ac·ft
Real-world example — Architectural to geographic scale
A 100,000-cubic foot measurement equals one acre-foot. The five-order-of-magnitude scale change comes up in mapping work where architectural site plans must be related to road-network maps.
100000 ft³ × 2.295684e-5 = 2.2956841139 ac·ft
Real-world example — Small to geographic-scale
100,000 cubic feet equals one acre-foot — a useful conversion when small-scale survey diagrams must be related to road-network distances on a different map.
100000 ft³ × 2.295684e-5 = 2.2956841139 ac·ft
Cubic Foot to Acre-Foot conversion table
Standard reference values for converting cubic feet to acre-feet:
| Cubic Foot [ft³] | Acre-Foot [ac·ft] |
|---|---|
| 0.01 | 2.295684e-7 |
| 0.1 | 2.295684e-6 |
| 1 | 2.295684e-5 |
| 2 | 4.591368e-5 |
| 3 | 6.887052e-5 |
| 4 | 9.182736e-5 |
| 5 | 0.0001147842 |
| 10 | 0.0002295684 |
| 20 | 0.0004591368 |
| 30 | 0.0006887052 |
| 40 | 0.0009182736 |
| 50 | 0.0011478421 |
| 100 | 0.0022956841 |
| 500 | 0.0114784206 |
| 1000 | 0.0229568411 |
Frequently asked questions
How many acre-feet is 1 cubic foot?
How do I convert cubic feet to acre-feet?
How do I convert acre-feet back to cubic feet?
How many acre-feet is 100 cubic feet?
Popular volume unit conversions
Convert Cubic Foot to other volume units
Show all Cubic Foot conversions
Metric / SI (15 units)
US Customary (Liquid) (15 units)
US Customary (Dry) (5 units)
Imperial (UK) (14 units)
Cubic (length-derived) (3 units)
Cooking / Culinary (5 units)
Sources & references
Conversion factor (1 ft³ = 2.295684e-5 ac·ft) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.