Centimetres, inches, metres, and feet
One plan, two ways to type the wall.
The calculator stores centimetres. The inch switch divides by 2.54 and shows roll length in feet (a 10.05 m roll is 32.97 ft). Switching back multiplies again. Round-trip rounding can move a value by a tenth; retype the figure from your tape if you need it exact.
Roll widths in the US are often 20.5 or 27 inches. 53 cm is about 20.9 inches, a common metric width. Type the width printed on your roll, not a memory of “about half a metre”.
Pattern repeat might be on the label in inches. Convert once, then leave the unit control alone while you adjust the window.