White Beadboard Kitchen Cabinet Doors - Step by step instructions for measuring your face frame cabinets for new cabinet doors. Most cabinet companies want you to give them the real door measurements rather than the rough openings. Openings are the real measurements of the holes that are rectangular in your cabinets that you just want to cover with cabinet doors. Convert them to door dimensions before you purchase and you'll need to take these measurements.
Check your cabinet openings when they are square to find out. This is easily achieved by by measuring diagonally from corner to corner both ways. Then your opening is square in the event the measurements are the same. When they're not, then you you should calculate the width at the top and bottom and take the larger of the two. Same thing goes for the height, measure height on the right and left sides and take the larger of the two. You now have the rough opening measurements.
Given that you have the rough opening measurements, what do you do with them? You now need to make a determination. Keep in mind how wide are the designs between openings? Stiles are the vertical strips since the the edges of the cabinet box. They'll both need clearance to swing open without hitting the do-or, even if this door is open as well if two-doors are side by side and hinge to hinge. The a mount of clearance is mostly a function which hinge you're using.
Check with your manufacturer to locate out how much you need. Hinges will need anyplace from zero clearance as much as a quarter of an inch. Check the bottom for any moldings that may hit the bottom of your doors and change appropriately.