To take accurate measurements for a fridge replacement, measure the depth, height and width of the old refrigerator and freezer after opening the door. Also, measure for door opening, ventilation and cleaning leaving at least 1 to 2 inches of extra room on the sides and top of the unit.
Open the door of the refrigerator and the freezer before measuring the depth, height and width in feet of the unit. For depth, measure from the front edge of the refrigerator's opening to the back wall. For width, measure from left to right, and for height, measure from top to bottom of the refrigerator's opening. Take measurements in a similar manner for the freezer. Multiply the three measurements separately for the refrigerator and freezer, and add the two results to get the total cubic foot size of the current fridge.
If a larger replacement fridge is to be bought, also measure for the door opening, and ensure that there is at least 2 inches of extra space on the hinge side to allow the fridge door to open to 90 degrees. Additionally measure the space available in the kitchen. Ensure that at least 1 inch of extra space if left on the top and sides of the replacement fridge for proper ventilation and easy cleaning.