Convert from button measure to yottameter

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.

Unit Definition (yottameter)
The yottametre (or yottameter), symbol: Ym, is a unit of distance. One yottametre is equal to 1x10+24 (1e+24) in scientific notation. Which is a very large distance. Note this is different from a yoctometre, which is 1e-24, a very small distance.