Pond Volume Calculator

Same template as pool: L × W × avg-depth × 7.48 gallons. For garden ponds.

Inputs

Result

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How to use this calculator

  • Enter L × W × avg-depth.
  • Read gallons + pump turnover and fish capacity.

About this calculator

Pond volume drives pump sizing (turnover at least once per hour), fish stocking density (rule of thumb: 1 inch of fish per 10 gallons), and chemical treatment dosing.

Frequently asked

Pump turnover rate?+
Once per hour for ornamental ponds. Twice per hour for koi (heavy bio-load).
Fish capacity rule?+
1 inch of adult fish per 10 gallons. So a 500-gal pond can support 50" of fish (e.g., 5 koi at 10" each).
Why include shallow areas?+
Average depth captures usable volume. Plant shelves at 1 ft, deep zones at 3-4 ft for koi.
Chlorinated tap water?+
Treat with dechlorinator before adding fish. Chlorine kills aquatic life.
Winter overwintering?+
Ponds need 2+ ft deep zones to keep fish below ice line in cold climates.

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