[fretzer]

For sea water, each 33’ of depth is 1ATM or 14.7psi.

[GingisK]

If you multiply 33 X .44444444 you get 14.6666666, which is what you calculated. Both ways give the exact same answer, and one method can be used to derive the other.

Take 14.7 / 33, you have .4454545454 PSI per foot.

I carried a higher precision in my constants than you.