Fitbit becoming less accurate over time?
April 1, 2014 10:21 AM Subscribe
I have a Fitbit flex I've been wearing for about eight months now. In the past couple months I've started tracking my runs with the RunKeeper app, and when I compare that with the fitbit the flex is way off --- up to 20% off in distance. The weird part is, this seems to be a new thing --- when i first got the flex I compared it a few times with google maps of known distances, and I wasn't getting these huge discrepancies. I tried manually entering stride length in the fitbit settings, but doesn't seem to have helped. Any suggestions as to why this might be happening? Has anyone else noticed this with their flex?
posted by Diablevert to Health & Fitness (9 answers total) 2 users marked this as a favorite
Other notes: it's a bit off and on, this inaccuracy, and seems to be way worse with running than walking. For instance, I have about a 12 min walk between my subway stop and my office; google maps has this distance as .7 miles, the fitbit recorded me this morning as walking .74 in that 15 min stretch where I walked to work.
Could it be that I somehow deeply fucked up my stride length measurements? When I first noticed the discrepancy with the running app and the fitbit, I went to their help forums, which suggested entering my stride length into the profile settings. I went to a local track, and went back and forth on a 100 meter stretch several times counting paces, first walking and then jogging at a moderate pace. I'm 5'4 and I calculated my walking stride length as 2'1.7" and my running stride as 3'1.9"
I know there's some way of putting the device into "activity mode" to record workouts, but as I've mostly been using it for running and walking I've never bothered to figure that out --- would that help at all?
I have been working on my running these past several months, and while I'm still pretty damn slow I'm certainly faster than I was when I first got the flex and was starting off with a run/walk program. Could it be that?