OK....I'll go see if I can find the website that had all these nice formulas, including taking in account the power factor and efficiency of the motor -----Original Message----- From: Dave VanHorn [mailto:dvanhorn@CEDAR.NET] Sent: Thursday, July 15, 1999 9:00 PM To: PICLIST@MITVMA.MIT.EDU Subject: Re: Looking for starting point. > H.P. can be done with the amount of watts that it draws. 1H.P. = 745 > watts (I think) Danger will robinson.. There's no allowance here for motor efficiency. A locked rotor may draw 20A, but it's not delivering ANY horsepower. (Zero)