Pond Volume Calculator

For rectangular ponds: Length (ft) x Width (ft) x Depth (ft) x 7.48 = gallons. For circular ponds: Radius^2 x 3.14 x Depth x 7.48 = gallons. For irregular shapes, multiply by 0.8 as an approximation. Knowing your pond volume is essential for stocking fish, sizing equipment, and dosing treatments.

The general guideline is 250 gallons per koi for long-term health. Koi can grow 24-36 inches and live 25-35+ years, so they need substantial space. A 1,000-gallon pond should hold no more than 4 koi. Overstocking leads to poor water quality, disease, and stunted growth.

A koi pond should be at least 3 feet deep (4+ feet is ideal) in most climates. Depth helps maintain stable temperatures, provides protection from predators (herons), and allows fish to overwinter safely below the ice line in cold climates. Shallow areas (1-2 feet) are fine for plants and margins.