You need to learn the formulas so that you can learn the processes. Once that's done, you'll find out that life is too short to be futzing over the decision to dive 30% or 31% and you'll go to standards mixes...then use tables or any of the commercially available software programs to plan your dives with.
But never mind all this, what the heck is an "Ocean X calculator (wheel)?"
But never mind all this, what the heck is an "Ocean X calculator (wheel)?"