Convert from yoctometer to button measure

Unit Definition (yoctometer)
The yoctometre (or yoctometer), symbol: ym, is a decimal fraction of a metre, from the International System of Units. One yoctometre is 1x10-24 (1e-24) in scientific notation. Very small!

Unit Definition (button measure)
The button measure is a unit of distance equal to 1/40 inch (0.635 millimeter), used to measure the thickness of buttons.