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Acre-feet to gallons
One acre-foot is 325,851 gallons. Convert any amount below, in either direction.
Exact conversions: 1 acre-foot = 43,560 cubic feet = 325,851 gallons (one acre covered a foot deep). The gallon figure is 43,560 cubic feet times 7.48052 gallons per cubic foot, rounded to the whole gallon. Household-years use an average US household of about 300 gallons a day (~109,500 gallons a year), per EPA WaterSense; real household use varies widely. Same math as the water units converter, which also converts flow in cfs.
Cite
Acre-feet to gallons: common volumes
| Acre-feet | Gallons |
|---|---|
| 0.1 | 32,585 |
| 0.5 | 162,926 |
| 1 | 325,851 |
| 2 | 651,702 |
| 5 | 1,629,255 |
| 10 | 3,258,510 |
| 100 | 32,585,100 |
| 1,000 | 325,851,000 |
| 10,000 | 3,258,510,000 |
| 1,000,000 | 325,851,000,000 |
Gallons to acre-feet: common volumes
| Gallons | Acre-feet |
|---|---|
| 10,000 | 0.0307 |
| 100,000 | 0.3069 |
| 325,851 | 1.00 |
| 1,000,000 | 3.07 |
| 10,000,000 | 30.69 |
| 1,000,000,000 | 3,069 |
How the conversion works
An acre is 43,560 square feet, so water one foot deep over an acre fills 43,560 cubic feet. A cubic foot holds about 7.48 US gallons, which puts one acre-foot at 325,851 gallons. To go the other way, divide gallons by 325,851: a million gallons is about 3.07 acre-feet.
Western water agencies count reservoirs, contracts and deliveries in acre-feet because the volumes are so large; a single big reservoir holds millions of them. What is an acre-foot? explains the unit itself, and the reservoir pages show how many acre-feet each tracked western reservoir holds today.
Common questions
How many gallons are in an acre-foot?
325,851 gallons. An acre-foot is one acre covered one foot deep, which is 43,560 cubic feet of water.
How do you convert gallons to acre-feet?
Divide the number of gallons by 325,851. One million gallons is about 3.07 acre-feet.
How many gallons are in 1,000 acre-feet?
About 325.9 million gallons (325,851,000).
How much water is an acre-foot for a household?
At an average of about 300 gallons a day, per EPA WaterSense, an acre-foot covers roughly three household-years of indoor and outdoor use. Actual use varies a lot by region and season.