Open the refrigerator and measure the width of the opening, or side to side; the depth, or front to back; and the height, or top to bottom, in inches using a tape measure. Make a note of these measurements.
Convert the measurements into feet by dividing each number by 12. Make a separate note of each measurement to one decimal place.
Multiply the length by the width by the height to find the cubic footage measurement. Write the number down to one decimal place.