How Is Solar Panel Efficiency Calculated?

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Miike012
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Sorry I was unsure where to submit this thread.
I am doing a school project on designing a solar system for my home and I was wondering how the efficiency of a cell is calculated.

The way I calculated it, which i read of a website is...
1. calculate area of cell (in meters)
2. divide watt of cell by area = efficiency.

Area: 61.39*41.18in2 = 2 528.0402 in2 = 2 528.0402*(0.0254)2 meters2 = 1.63099042 m2.

Total watt: 327

Efficiency = 327 / 1.63099042 = 200.491674.

What I am doing wrong?

The efficiency of my panel is 20-21 %

HERE ARE THE DIM OF MY PANEL
 

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Actually because efficiency = energy out as electricity / energy in as light

would the correct calculation be 200.491674w-m^2/1000w-m^2 =0.200491674

where 1000w-m^2 is the most amount of power a panel can intake
 

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