BMI Measurement

What is the best way to determine my BMI? I have an Aria scale where it tells me, but I don't know how accurate it is. I have lost almost 10 lbs (from 173.5 to 164) and about 3 inches from my waist since Jan 2. Aria says my BMI is 40.4%.. If that's correct, I still have a lot of work to do. I'm not too worried about what the scale numbers tell me since I am loosing inches, i was in between sizes and now i wear the smaller size and my energy has changed 100%.. I guess I'm just curious on the most accurate way to track my BMI.

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