How to know the power supply watts of your psu!!!???

I am really confused......My psu cover has no details of watts on it .....i can only see +12v & -12v rails.........then something like 5, 3.3
SORRY BUT I M REALLY NEW TO THESE PSU'S!!!!
I will be grateful to the people who will let me know my psu's power output!!!!!
PLEASE ,,,,HELP ME
Btw this is my 2nd PC
My first PC has got cooler master 450 w

BUt on my 2nd pc i hv got a factory fitted one!!!!!!
Something like CIRCLE (company name)!!!
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  1. Could you tell us the model number for the PSU in question?
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