Pond Size Calculator
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Calculate Your Pond Volume Instantly
Whether you are building a new Koi pond or treating an existing water feature, accuracy matters. Overestimating volume wastes money on chemicals, while underestimating can lead to ineffective filtration. Our Pond Size Calculator handles standard shapes (Rectangles, Circles) and irregular "Kidney" shapes to give you a precise gallon count.
Measuring Tips
- Average Depth: Most ponds have shelves or sloped bottoms. Take depth measurements at several points and average them.
- Irregular Shapes: For complex organic shapes, visualize the pond as a basic oval or kidney and measure the widest and longest points.
Fish Stocking Guidelines
A general rule for goldfish is 10-20 gallons per fish. For Koi, you need significantly more volume—often recommended at 250+ gallons per adult Koi to ensure healthy growth and water quality.
Frequently Asked Questions
How many gallons is a 10x10 pond?
A 10ft x 10ft pond that is 2ft deep holds approximately 1,500 gallons (10 x 10 x 2 x 7.48).
How do I verify the volume without measuring?
If your pond is already filled, you can use a "salt test" method or verify by timing how long it takes to fill with a hose of a known flow rate (e.g., utilize a 5-gallon bucket test).