Things You'll Need
- Online pond calculator
- Tape measure
- Pencil
- Paper
- 10-gallon bucket
- Hosepipe and water supply
- Stopwatch
Instructions
Square or Rectangular Pond
Measure the length, width and depth of your fish pond in feet, and note the three measurements.
Multiply the three measurements together (length times width times depth) to find your pond's volume in cubic feet.
Multiply this number by 7.5 to calculate the volume in gallons.
Round Pond
Measure the diameter of your round pond at the top and the bottom. These figures may be the same if your pond is a fixed depth, but this volume calculation also works if your pond's diameter is smaller at the bottom.
Take a depth reading at the center of the pond. Multiply the top diameter by the bottom diameter and multiply this total by the depth.
Multiply the total by 0.785 for your pond's volume in gallons.
Irregularly Shaped Pond
Fill the 10-gallon bucket with water from the hosepipe, and use the stopwatch to monitor how long this takes.
Restart the stopwatch and place the hosepipe into the empty pond, without stopping or changing the water flow, and monitor the length of time required for the pond to fill up.
Divide the time taken to fill the pond by the time taken to fill the 10-gallon bucket. Multiply the answer by 10 for your fish pond's volume in gallons.