Convert Acre-Foot to US Gallon
Convert acre-feet to us gallons instantly. 1 acre-foot = 325851.4285714285 us gallon — use the live calculator, the exact formula, a conversion table and worked examples. Also check the US Gallon to Acre-Foot converter for the reverse conversion.
Units explained
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.
US Gallon
The US liquid gallon is defined as exactly 231 cubic inches (3.785411784 liters).
Based on the English wine gallon of 231 cubic inches, retained by the US after 1824.
The primary US unit for fuel, milk and large beverage containers.
English wine gallon; US since 1824.
Acre-Foot to US Gallon conversion formula
The relationship between acre-feet and us gallons:
To convert acre-feet to us gallons, multiply the value in acre-feet by 325851.4285714285. To reverse, multiply us gallons by 3.068883e-6.
How to use this converter
Type a value into the calculator. The result in us gallons updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the US Gallon to Acre-Foot converter for the reverse direction.
Step-by-step: convert acre-feet to us gallons
- Write down the value in acre-feet (ac·ft).
- Multiply that value by the factor 325851.4285714285.
- The product is the equivalent value in us gallons (gal).
- To reverse, multiply the us gallon value by 3.068883e-6.
Worked examples
Example 1 — Convert 1 ac·ft to gal:
1 × 325851.4285714285 = 325851.4285714285 gal
Example 2 — Convert 100 ac·ft to gal:
100 × 325851.4285714285 = 3.258514e+7 gal
Real-world example — Geographic to architectural conversion
One acre-foot equals 100,000 us gallons. The conversion bridges geographic-scale survey work and architectural-scale building plans on the same drawing.
1 ac·ft × 325851.4285714285 = 325851.4285714285 gal
Real-world example — Geographic to architectural scale
One acre-foot equals 100,000 us gallons. Map scales use this when an architectural site plan (in the smaller unit) must be related to road-network plans (in the larger unit) on the same drawing.
1 ac·ft × 325851.4285714285 = 325851.4285714285 gal
Acre-Foot to US Gallon conversion table
Standard reference values for converting acre-feet to us gallons:
| Acre-Foot [ac·ft] | US Gallon [gal] |
|---|---|
| 0.01 | 3258.5142857143 |
| 0.1 | 32585.1428571429 |
| 1 | 325851.4285714285 |
| 2 | 651702.857142857 |
| 3 | 977554.2857142856 |
| 4 | 1303405.7142857141 |
| 5 | 1629257.1428571427 |
| 10 | 3258514.2857142854 |
| 20 | 6517028.5714285709 |
| 30 | 9775542.8571428563 |
| 40 | 1.303406e+7 |
| 50 | 1.629257e+7 |
| 100 | 3.258514e+7 |
| 500 | 1.629257e+8 |
| 1000 | 3.258514e+8 |
Frequently asked questions
How many us gallons is 1 acre-foot?
How do I convert acre-feet to us gallons?
How do I convert us gallons back to acre-feet?
How many us gallons is 100 acre-feet?
Popular volume unit conversions
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Metric / SI (3 units)
US Customary (Liquid) (1 units)
Imperial (UK) (1 units)
Cubic (length-derived) (1 units)
Sources & references
Conversion factor (1 ac·ft = 325851.4285714285 gal) 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.