Pond Acre-Feet Volume Calculator
Calculate pond surface acres, acre-feet of volume and total gallons from length, width and average depth for treatment and stocking planning.
How This Calculation Works
Surface acres equals length times width divided by 43,560 square feet per acre. Acre-feet equals length times width times average depth, again divided by 43,560. Total gallons is acre-feet times 325,851 gallons per acre-foot.
Field Calibration & Rate Reference Chart
| Surface ac | Avg depth | Acre-feet | Copper lb @ 1 ppm |
|---|---|---|---|
| 0.25 | 4 ft | 1.0 | 2.7 |
| 0.5 | 4 ft | 2.0 | 5.4 |
| 0.5 | 6 ft | 3.0 | 8.2 |
| 1.0 | 4 ft | 4.0 | 10.9 |
| 1.0 | 6 ft | 6.0 | 16.3 |
| 1.5 | 5 ft | 7.5 | 20.4 |
| 2.0 | 5 ft | 10.0 | 27.2 |
| 2.0 | 8 ft | 16.0 | 43.5 |
| 3.0 | 6 ft | 18.0 | 49.0 |
| 5.0 | 6 ft | 30.0 | 81.6 |
Common Questions
How do I calculate acre-feet of water in a pond?
Multiply surface area in acres by average depth in feet. Surface acres is length times width divided by 43,560. A one-acre pond averaging 6 feet deep holds 6 acre-feet.
How many gallons are in an acre-foot?
One acre-foot equals 325,851 gallons, the volume of water one foot deep over one acre. That figure converts acre-feet into gallons for dosing and irrigation planning. It is a standard water-resources unit.
How do I measure average depth in a pond?
Take depth soundings on a grid across the pond and average them, rather than using only the deepest point. Ponds often have shallow shelves that lower the average. A marked rope or a depth finder makes the survey quick.
Why does pond volume matter for treatment?
Chemical and dye doses are calculated per acre-foot, so an accurate volume prevents under- or over-treatment. Over-dosing can harm fish and plants, while under-dosing fails to control the target. Volume also sizes aeration and stocking plans.