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Accuracy of fitbit for calories burned
12-19-2015, 02:51 PM
Post: #1
Accuracy of fitbit for calories burned
I bought a fitbit over black friday and am wondering how good as it calculating how many calories burned? It's the Charge HR version and does calculate calories burned during my lifting sessions as long as I don't sit too long while resting.

How accurate is this fitbit for calories burned overall? I'm averaging 2100 calories a day for the week in calories burned. This is with working towards getting 10,000 steps in a day which is more activity than I done when finding my TDEE. I estimated/reseted at 2300 and have been doing 10% cut (2070). This is my second cut in. I'm wondering if I'm not moving enough to see any weight loss at this 10% cut.
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12-19-2015, 08:28 PM
Post: #2
RE: Accuracy of fitbit for calories burned
I just have the Flex, not the Charge, but mine seems to be fairly accurate. When you set it up, does it ask if you will be wearing it on the dominate hand or non-dominate? And I assume it asks you for stride length?

So (and forgive me for not reading back, but..) what happened on your reset when you ate 2300?

Anitra Soto
Team EM2WL
ISSA Certified Fitness Trainer
ISSA Certified Specialist in Senior Fitness

My EM2WL Journey: http://eatmore2weighless.com/never-too-old-anitra/
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12-19-2015, 08:51 PM (This post was last modified: 12-19-2015 08:52 PM by MaryJo.)
Post: #3
RE: Accuracy of fitbit for calories burned
I know I was definitely gaining at 2400. At 2300, I seemed to be stable but it might have been just not as drastic upwards trend. I do look like I was more stable around 2200. Maybe I overshot my TDEE all this time and that's why I steadily gained weight...

I am wearing it on my non-dominate and have it set as such. I could also put in stride length but I haven't. I added my weight, age, and height.

Here is my weekly trends over the summer where I thought 2300 was my TDEE.
06/13/2015: 176.1 2054.0
06/20/2015: 177.4 2174.6
06/27/2015: 177.3 2213.7 T
07/04/2015: 177.4 2212.3
07/11/2015: 177.5 2082.7 (didn't calc a couple days)
07/18/2015: 178.0 2214.6
07/25/2015: 178.7 2456.0
08/01/2014: 178.6 2337.3 T
08/08/2015: 179.0 2365.1
08/15/2015: 179.2 2175.8
08/22/2015: 180.1 2417.7
08/29/2015: 181.1 2410.6 T
09/05/2015: 181.6 2374.3
09/12/2015: 180.6 2171.6
09/19/2015: 181.1 2439.0
09/26/2015: 182.3 2231.3 T
10/04/2015: 182.5 2219.1
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12-20-2015, 10:20 AM
Post: #4
RE: Accuracy of fitbit for calories burned
I would definitely add your stride length if that is an option. The more data it has to work with the better.

And yeah, you may have been slightly over your TDEE while resetting, but that's not a bad thing! Makes it the perfect environment for building some muscle... Just remember that if you happened to have reset *over* your TDEE, then your cut will be 10 or 15% off of your actual TDEE and not that higher number.

I would enter your stride length and give it a week or so to adjust, and then yes I would generally trust those FitBit numbers.

Anitra Soto
Team EM2WL
ISSA Certified Fitness Trainer
ISSA Certified Specialist in Senior Fitness

My EM2WL Journey: http://eatmore2weighless.com/never-too-old-anitra/
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12-20-2015, 12:51 PM
Post: #5
RE: Accuracy of fitbit for calories burned
Hi Mary Jo, I just got a Charge HR on the Black Friday sales too. I'm finding it overall accurate in terms of what the various calories counters out there say for just general activity, and according to the values on the HeyBales worksheet (if you are ever in MFP you probably see him there). However, I am not manually logging exercise - you and I both seem to be letting the Fitbit just calc our calories during lifting/other exercise and i'm assuming it uses heart rate? Does anyone know?

What I'm finding interesting is that using this methodology, lifting and power yoga burn more than i would have thought, running/spinning burn less for me than what calcs say (ie, 150 lbs you should burn 500 cal in 45 min spinning - I seem to burn more like 365). Walking burns more than i thought, and if I don't exercise at all I am barely allowed to eat, haha. My "normal" TDEE is pathetic. However, if I have a typical exercise day, I might spin 45 min/bodyweight exercises 15 min OR bootcamp 60 min OR lift 45-60 min/maybe run 15 min, then work and sit,then come home and walk my dogs for 30 min and do some yoga for 30 min, make dinner and more sitting, and those days show burns of 2300-2500 calories depending, and Scooby estimates 2400 for my stats and that amount of time towards activity. So kinda right on I think.
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02-14-2016, 02:35 PM
Post: #6
RE: Accuracy of fitbit for calories burned
I have a Polar, but the battery need replacing so not using that. I will again by the time I am lifting in the gym. I can't wait to see what it says, although I know these gadgets can only come close to what is actually happening. I have really shed the perfectionism thing I was doing, and things started going so well, I finally lost 24 lbs. I did gain back from 118 to 122, but I don't pay a lot of attention to the scale anymore either.

Following these gals like Kiki, Anitra, and others I have seen along the way, I feel this will just become easier as it will become a lifestyle for me. I'll just find my pace. I'm 63, and it is the first time in my life I have gotten serious about strength-training. I want to do well to maybe be able to encourage others my age to never give up.
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