[NJARC] how to calculate the wattage for a candohm resistor

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I need to replace a candohm resistor with four resistances and because 
candohm resistors never show the wattage I am trying to calculate this for 
the first time.
So my understanding is that you measure the voltage across a good section of 
the candohm....say in this case 25K then calculate Voltage squared divided 
by 25K = Watts dissipated. Then use a wattage that is double the calculated 
number.
So if this is correct I measured......122 volts DC across the 25K 
resistor....so 122 SQRT (square root) I was never that good at math) is 
11.045 divided by 25000 and I come up with 4.418 and doubled is about 10 
watts......did I screw this up......10 watts does seem like a nice number.

thanks much