Free pond calculators
Pond Calculator Tool
Calculate pond gallons, pump size, surface area, and liner size with this easy-to-use pond calculator
Pond shape
Enter a number greater than 0.
Enter a number greater than 0.
Enter a number greater than 0.
Enter a number greater than 0.
The highlighted line shows what each box measures. Your numbers appear on the drawing.
Your results
Pick your pond shape and enter its size to see the volume, pump size and liner size.
0US gallonsPond volume · 0 cubic feet
- Surface area
- 0 ft²
- Pump size
- 0 GPHMoves the whole pond every 2 hours
- Liner size
- 0Length and width + 2 × depth + 1 ft overlap
How we calculate this
- Volume = surface area × depth, and 1 cubic foot holds 7.48 US gallons.
- Surface area: circular
π × (diameter ÷ 2)², rectangularlength × width, ovalπ × (length ÷ 2) × (width ÷ 2), irregularmax length × max width × 0.85. - Irregular ponds use
⅔ × max length × max width × max depthfor the volume, because they are not full to their maximum size everywhere. - Pump size = half the pond volume per hour, so the pump moves all the water every 2 hours.
- Liner = length (or width) + 2 × depth + 1 ft for overlap, rounded up to the next foot.
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