The increment decides your options
Adjustable posts do not offer continuous height. They offer a fixed ladder of positions, so the achievable height jumps in steps.
That means the useful question is not "what height do I need?" but "which available position is the first one taller than my tote?" You will almost always end up with some spare height, and that spare height is the working clearance you need to lift the tote in and out.
Measure the tote first, then set the shelf
Setting shelves to evenly spaced heights and then buying totes to suit is the harder path, because tote heights are set by the manufacturer.
Measure the tallest tote you intend to store on a level, add your lifting clearance, and set the shelf to the first position above that total.
Remember what is under the next shelf
The limiting height is to the lowest obstruction overhead, which on wire shelving may be a shelf collar, sleeve or bracket rather than the shelf surface itself.
Measure to whatever the tote would actually strike.
Check your own measurements
Check a tote against a chosen level height — the calculator runs entirely in your browser and stores nothing.