Exterior kitchen door almost ordered

We went to Home Depot to order a new kitchen exterior door when we did not know the measurement of the jamb. Our associate said that most standard sizes were:4 9/16", 5 1/4", or 6 9/16". Which means ours has to be different - 6.25". I think that probably means it is 6 9/16, but I need to check with our contractor before ordering. Older homes with some previous modifications do not always fit the current inventory of pre-fabricated cookie cutter dimentions.

While we were there, we did get some utility shelves for storing what is currently in our cabinets during the renovation.