Pond Volume Calculator

Summary

Calculate the volume of a garden pond by shape — rectangular, circular, oval, or irregular — in US gallons and liters. Use the result to dose treatments accurately, estimate fish capacity, or size a pump.

How it works

1. Select your pond shape: rectangular, circular, oval, or irregular.
2. Enter the required dimensions for that shape (length, width, depth, or radius).
3. For irregular ponds, enter an average length, average width, and average depth.
4. The calculator applies a shape factor and displays volume in US gallons and liters.
5. Use the result to calculate treatment doses or estimate fish stocking levels.

Use cases

• Calculating the correct dose of algaecide or pond treatment chemical.
• Estimating how many goldfish or koi a pond can support.
• Sizing a water pump or filter system by total pond volume.
• Figuring out how long a hose will take to fill or refill the pond.
• Planning water changes for fish health in a garden pond.
• Checking whether a new pond design meets a target volume.

Frequently Asked Questions