Use the Acre-Feet to Gallons Calculator to convert water volume into US gallons. Simply enter the number of acre-feet to find the equivalent volume for water storage, irrigation, or reservoir planning.
What Is an Acre-Foot?
An acre-foot is a unit of volume commonly used in the United States to measure large quantities of water. It represents the volume needed to cover one acre of surface area to a depth of one foot.
One acre-foot equals 43,560 cubic feet, or approximately 325,851 US gallons. USGS conversion factors
How to Use the Acre-Feet to Gallons Calculator
- Enter the water volume in acre-feet.
- Use a whole number or a decimal, such as 2 or 0.5.
- Read the equivalent volume in US gallons.
Formula for Acre-Feet to Gallons
Multiply the volume in acre-feet by the conversion factor:
US Gallons≈Acre-Feet×325,851
The examples below use the rounded factor of 325,851 US gallons per acre-foot.
Step-by-Step Calculation
Example 1: Convert 2 Acre-Feet to Gallons
Given: Water volume = 2 acre-feet.
Multiply by the conversion factor:
US Gallons≈2×325,851=651,702
Therefore, 2 acre-feet is approximately 651,702 US gallons.
Example 2: Convert 0.5 Acre-Feet to Gallons
Given: Water volume = 0.5 acre-feet.
Apply the same conversion:
US Gallons≈0.5×325,851=162,925.5
Therefore, 0.5 acre-feet is approximately 162,925.5 US gallons.
Frequently Asked Questions
1. Does this calculator use US gallons or Imperial gallons?
The conversion shown here uses US liquid gallons. Imperial gallons are a different volume unit and require a different conversion factor.
2. Can I convert fractional acre-feet?
Yes. Enter a decimal value, such as 0.25, 0.5, or 1.75, to convert a fractional number of acre-feet into gallons.
3. What is the difference between an acre and an acre-foot?
An acre measures area, while an acre-foot measures volume. Knowing a pond’s surface area in acres alone is not enough to determine its water volume; you also need its depth.
4. Why might another calculator give a slightly different result?
Calculators may use different levels of precision. These examples use the rounded factor of 325,851, while a more precise factor is approximately 325,851.4286 US gallons per acre-foot. Small differences in the final digits can result from rounding.
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