Pond Volume and Gallons Calculator
Free pond tool

Pond Volume and Gallons Calculator

Enter length, width and average depth and see the gallons your pond holds, the pump flow to aim for and the water for a first fill.

These tools give planning-level estimates from typical values. They are not quotes, designs or engineering, and results depend on your actual soil, depth, access, local rules and conditions. Only a visit can confirm what a job needs, and we give you a clear price before any work begins.

How it works

Four quick steps.

  1. 01

    Measure the pond

    Length and width at the longest and widest points, in feet.

  2. 02

    Pick the shape

    Rectangle, oval or free-form.

  3. 03

    Add the average depth

    Shelves and a deep center average out.

  4. 04

    Read the plan

    Gallons, pump flow, water weight and fill time.

Tips

  • Use the average depth, not the deepest spot.
  • Free-form ponds hold about four fifths of a rectangle with the same length and width.
  • Size the pump and filter from the volume, not the surface area.
Questions

About this tool.

Is this exact?

No. It is a planning guide. Shelves, slopes and rocks change the real volume, and we measure on site.

Why does volume matter?

Pumps, filters, treatments and fish numbers are all sized from the gallons in the pond.

How do I measure a free-form pond?

Use the longest length, the widest width and the average depth, then choose the free-form shape.

Free estimate

Ready for water in your yard?

Quick scheduling, careful work and a clear price before we start.

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