Aria 2 BMI readings are wrong

[Northern-Light]

I have a fitbit Aria 2 and the BMI is quite off.  My Aria 2 shows my BMI at 34-34.4%, but if I put my weight and height in a BMI calculator it shows as 26.5%

The scale is on a hard flat surface and I weigh myself bare footed.

I've tried adjusting my profile gender, saving, then setting back and saving along with removing the batteries and weighing myself 5 times in a row as shown in another thread, but it still shows the same BMI.

I read that the Aria 2 uses bioelectrical impedance to calculate the BMI.  Could sodium impact that?  I keep myself on a low sodium diet vs the average person per my Dr of 10,000mg of sodium.

Moderator edit: updated subject for clarity

[JohnnyRow · Accepted solution]

First, let's make sure what you are talking about.  You say BMI (body mass index), but it sounds like you are talking about fat %.  These are often confused but are totally different things.

BMI is a simple calculation from height and weight and is not a percent.  Body fat % is the makeup of your weight.

[Northern-Light]

You're totally correct.  I've been misreading what that number is all along.  Thanks for your help.