Convert from royal foot to fermi

Unit Definition (royal foot)
The royal foot is a French pied de roi, also called the Paris foot in English.

Unit Definition (fermi)
The Fermi was a metric unit of distance formerly used in atomic physics. One Fermi equals 10e-15 meter, or 1 femtometer. The unit was named after Enrico Fermi (1901-1954), the Italian-American physicist who built the first nuclear reactor.