how to calculate mechanical watts out?

[olmod]

I wanted to check on a motor wich ive dyno'ed but wondered if there was a universal standard way to do this .the motor test results were,8000rpm@5.2amps yielding283grams@1cm. im looking for a simple nuts n bolts way (im no mathematition) lol, to check watts in against watts out . thanx in advance. :)

[Bruce Abbott]

Power(W)=Torque(g-cm)*Speed(rpm)/97403

8000*283/97403 = 23.2W

If you have voltage and current then you can calculate efficiency, Pout/Pin. For example, if input voltage is 7.4V and current is 5.2A, then power in is 7.4V*5.2A = 38.5W, and efficiency is 23.2/38.5 = 60.3%.