all you need to do is measure the circumference of YOUR toaster---take a tape measure & measure around the appliance- then add about an inch for *fudge room* you do not need to worry about her metric measurements- your toaster may not be the same size as hers- that's why she says- start with measuring your appliance- after measuring you divide the measurement in half- write that number down- measure the height of the appliance---then follow the rest of the instructions.