Fitbit Incorrect

David___D

Hi all,

Just thought I would put up something I noticed recently.
During my running I continue to use my fitbit, but I also wear my heart rate monitor with a built in GPS, anyway have recently noticed after a run first thing in the morning my fitbit will say I have run 3.8k based on my steps. yet the more accurate GPS will give my distance as I planned as 5k.

This also happens during a 10k run, again fitbit saying I have only gone 7.8k based on my steps.
Thought I would make people aware just in case you thought you were going a shorter distance than you actually are.

What a bonus!!

GreatDepression

I did notice that my Fitbit zip seems to "underestimate" my exercise steps. Since I now use fitbit paired with MFP to calculate burned calories (for extra food), I guess this underestimating is good since it'll help me stay at a deficit if I decide to eat back earned calories.

KarenJanine

Have you calibrated you fitbit to your stride length? If not then this could account for the difference.