Calculate System Capacity
Ready to track your pond parameters and treatments like a pro?
Try Koi Toolkit PRO →Knowing your exact water capacity is the most fundamental part of koi keeping. Without an accurate volume, every medication dose or water treatment is a guess. This pond volume calculator supports both rectangular and circular shapes, helping you find your total capacity in both Litres and US Gallons instantly.
For rectangular ponds, we calculate volume by multiplying length, width, and average depth. For circular or "vortex" style ponds, we use the radius squared multiplied by Pi and depth. Our pond volume calculator does the complex maths for you, ensuring that whether you are building a new system or maintaining an old one, your measurements are precise.
Overdosing treatments like Potassium Permanganate or Formalin can be fatal, while underdosing is often ineffective and can lead to chemical resistance in parasites. Always use a koi pond volume calculator to verify your system size before adding any medication. Remember to account for any large filter bays or additional pipework that might hold significant amounts of water.