Servo watts calculation

[Joe Ross]

You can compare to this spreadsheet. Looks like the only difference is due to rounding. http://www.chiefdelphi.com/media/papers/2751

[Tristan Lall]

It's worth noting that what the servo industry calls "power", knowledgeable people call "wrong". Divide that false rating by 4 to get the theoretical maximum power of the servo, which you can use for mechanism design.

(It's false because there exists no condition¹ where a DC brush motor is simultaneously spinning at its free speed and drawing its stall current.)

¹ Assuming that the motor is connected only to an electrical power source at steady state.