There are 2 formulas that give roughly the gallons of a pond:

Rectangle or squa

L x W x D x 7.48 = gallons

Circle;

3.14 x Diameter x Depth x 7.48 = gallons

Measurements in feet.

The way to more accurately figure is using salt. See Roark's salt
calculator at www.click2roark.com

Thanks Nick & Geoff. Hopefully the above was interpreted
correctly. ;-) ~ jan
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Zone 7a, SE Washington State
Ponds: www.jjspond.us