Calculating ''C'' rating

[mistercrash]

I ordered this thing here to test my lipos

http://www.westmountainradio.com/CBA.htm

I have never been good at Math so I have to ask if I got it right. With the help of this battery analyzer, I want to record the specs of my lipos and monitor how well they perform and for how long. This thing will display voltage, current, amp, watts and temp throughout a discharge of up to 150 watts or 40 amps. One thing I want to calculate with the data that I will get from this device is if the C rating of a lipo is rated accurately by the manufacturer, so I want to make sure I have the formula right. It should be:

Amp/hrs X 1000 = C rating
lipo's Mah

Am I correct?