Router HP rating

I'm puzzled by the hp ratings of routers(universal motors), no way can a 15 amp circuit(most typically found in home workshops) can produce 3+ hp as marketed by manufacturers. Are these ratings "peak power" ratings or just some other form of snake oil kicked out by marketing departments. Amps or watts are listed by the UL(United Laboratories) on nearly all tools and these are continuous use ratings, the UL does not consider hp produced so there really is no accurate universally accepted hp rating method so....?

thanks, Brian