CichlidFish.com - Fish That Think.

anyone know how to calculate volume of a diamond tank?

try 2.598 times the square of the length of a side times the height. so 2.598(sidelengthxsidelength)xHeight

Pick a side, take the absolute length of it then multiply it by the front to back length perpendicular to the side you first measured.

...then multiply by the height.

Whatever unit you want should determine whether you measure in inches or feet.

7.48 gal per ft³ (I think)

Math is very rusty. How would I calculate volume of a circular tank/pond?

Here:
Aquarium Calculator
http://boonedocks.net/fishtank/ftweb.php
make it easy on youself!