Pond Volume Calculator
Calculate pond volume in gallons and liters based on shape and dimensions, with pump size recommendation.
Pond Volume
Pond volume depends on the shape of your pond.
Rectangular/Square:
Volume = Length × Width × Average Depth
Circular:
Volume = π × Radius² × Average Depth
Oval:
Volume = π × (Length/2) × (Width/2) × Average Depth
Conversion factors:
- 1 cubic foot = 7.48 gallons
- 1 cubic meter = 264.17 gallons = 1,000 liters
Pump sizing guidelines:
- Circulate the entire pond volume every 1–2 hours
- Fish pond: Full volume every 1 hour
- Water garden (plants only): Full volume every 2 hours
- Koi pond: Full volume every 1 hour + extra filtration
Stocking guidelines:
- Goldfish: 1 fish per 10 gallons of pond volume
- Koi: 1 fish per 250 gallons of pond volume
- Water lilies: 1 per 10 sq ft of surface area