How many gallons of water do I have

Question:
Square and Circle Pond Calculator PROBLEM..?
I just want to ask how to compute POND SIZE, IDEAL STOCK LEVEL OF FISH, PUMP SIZE and LINER SIZE..???

My inputs are LENGTH(meters),WIDTH(meters),DEPTH(meter… and WATER TURN OVER PER HOUR..


Answer:
For gallons in pond, multiply width x length x depth, then multiply x 7.5 to get gallons.
In a circle, the formula is pi x the radius squared and then multiply x 7.5 for gallons.
A safe bioload is 1 linear foot of fish per 25 square feet of pond surface.
Have a pump moves all the water at least every two hours.