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I want to calculate the LM339 comparator power efficiency, so I thought the best way is to calculate the output RMS power and the Power dissipation and the quiescent(DC) power then will get the input power. then Eff=Po/Pin but I have a problem in calculating the DC power? I'm i doing it right? and how to calculate the quiescent power for the comoparator as there is no Iq in datasheet?

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Figure 1 in the data sheet: -

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It also says 0.8 mA on page 1.

The better option would be to use a DC (average) milli ammeter.

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