As far as I know I just have regular hypo. But using a H7 with my phone along with my fitbit and this websites app have been great motivators to keep me on track

I have both a Jawbone UP24 & a Fitbit Flex. Activity trackers show you your TDEE—way more accurately than any online calculator. I ate back all my calorie adjustments, and I lost weight.

Did you sync your fitbit with myfitnesspal then? Out of interest, what did you set your calories too before any exercise adjustments? I've avoided syncing mine yet. I worked out what I ate over a month to keep my current weight stable and have just minused 10%. I use fitbit to check I am burning my TDEE and myfitnesspal to eat 10% less than that. Only in my first week of the new weight loss phase so any guidance would be great!

Not sure, though I should be... I've used a Fitbit for a few years, and over the past year or two have had fluctuating TSH levels that concerned my doctors. A specialist I am seeing for another issue, periodically had me do full thyroid panels as he felt the TSH only test was inadequate. He did put my on medication within the past 4 months and now my TSH is the lowest it has been in the past two years and more stable. I am not sure whether I've had symptoms-- I mean I do have difficulty losing weight (though I do slowly lose if I diet and exercise), I did often feel drowsy, other people commented I feel cold to the touch and my morning basal temperatures seemed lower than average (I track my monthly cycles including my temperature first thing in the morning for other reasons), and I had a low resting heart rate.

Since starting meds, my morning temperature has increased a little, I've had a little more energy, my resting heart rate is about 5bpm higher and my hrm credits me with slightly higher calorie burn estimates than it use to. So I guess I must have been mildly hypothyroid when I started using my Fitbit or sometime after.

Saying that, my Fitbit seemed to give me a pretty accurate calorie burn--a little high but not bad. I was using my fitbit for general movement and step based activity and logging my heart rate monitor calorie burn for non-step or resistance activities. When I was weighing my food portions and carefully logging, I usually lost a pound per 4,000 calorie deficit (rather than the 3,500 commonly quoted though I have read that many people are more likely to lose a pound of fat for a 3,800 calorie deficit rather than the common 3,500). So if the 3,500 deficit is true, either my food logging or fitbit/hrm calorie burn was off by about 72 calories a day. I can work with that. Since my HRM calorie burn has slightly but noticeably increased since taking meds, it could be using an HRM was helping with accuracy for some activities as it would always credit less than online calculators do. I currently use a Fitbit One plus Polar H7 HRM strap and the app Digifit ICardio (which I sync to my Fitbit account). I use to use a Polar F11 (now discontinued) and still do for water activity. I haven't been dieting since taking thyroid meds, so I can't say whether it is more accurate now or not though (or that I am not still a little hypo).

I've been using the same methods as kimsied and too have noticed somehow perhaps by magic that it takes me more calories per pound. This disease has kind of turned me into a fitness data nerd in a few respects.

After using the HRM. I am going to push it on whoever is really mad trying to lose the weight. I was really mad.
In the last month I have had it it has helped me make a huge difference. In the my polar app if I burn 4500 calories in any given week from workouts the weight magically falls off. I lost like 3lbs with my 7000 a week deficit that week.
My food scale is an epic wonderful piece of fat losing machinery.
The fitbit is a wonderful tool too. I like the dashboard. I look at the activity minutes and usually can lose if I at least double the activity minutes it asks you to do for the week.
Most of the time over the course of a week it will be a .5, 1, 1.5 or 2. As long as I lose anything its good with me.

I like to think of this as a triple threat for my me v. thyroid efforts.

This digifit you speak of syncs to fitbit? that sounds amazing. Does it do the activity minutes too?

This digifit you speak of syncs to fitbit? that sounds amazing. Does it do the activity minutes too?

The activity minutes for logged exercise do have to do with the calorie burn per minute of the workout. For my stats, to see very active minutes I need to burn about 6 times my resting rate per minute. So the minutes do count if the calorie burn per minute is high enough. I do find logging my heart rate monitor burn, sometimes a vigorous workout will be credited as "moderately active" because my calorie burn per minute isn't quite where it needs to be for the standard. I think this is because my heart rate tends to be a little slower, and HRM calorie burn estimates are based on average heart rate. So this likely varies by the person. I believe hypo people tend to have slower heart rates, but I am not sure if it applies to exercise or just slow resting heart rates.

Digifit is a heart rate monitor app, I have an iPhone but I think it also has an android version. It does require a compatible bluetooth HRM strap to work (the straps that work may vary by your phone).