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Construction Calculators

Pond Calculator

Estimate the water volume in gallons of an irregularly-shaped garden pond from its length, width, average depth and a shape factor.

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Use 1.0 for a rectangular pond, 0.8 for a rounded oval shape, or 0.6-0.75 for a free-form, irregular shape.
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About the Pond Calculator

Garden ponds are rarely a perfect rectangle, so this calculator applies a shape factor to a simple length × width × depth estimate to better approximate the true water volume of a rounded or free-form pond.

Formula: Volume = Length × Width × Average Depth × Shape Factor; Gallons = Cubic Feet × 7.48

Measure average depth by averaging several spots across shelves and the deep zone, since most ponds vary in depth. Knowing your pond's gallon volume is essential for sizing a pump, filter and UV clarifier, and for dosing treatments correctly.

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