I don't know which Fitbit you have, but neither your tracker, nor the cross trainer will be 100% accurate. This is hard to calculate. If you are in the quest for a perfect data, just forget it. 100% accurate data is achieved in nearly laboratory-looking rooms, with lots of cables and closed environment, so they measure even what you exhale.
As for the mass electronics, anything which does not have chest-strap for heart-rate monitoring is simply not accurate. Even the devices with chest strap are not great in measurement, for which you need the device to be certified by a legal organization, saying that it measures very close to the real deal.
I just purchased yesterday Fitbit One. I never planned to have it with the intention for seriour measurement. I just need something to track my basic stats, that's all. For serious training I have a specialized runner-watch (in my case, I have Sigma Onyx Pro, which is an old model, probably today the Garmin Forerunners are better, no idea). However my watch is certified as ECG-accurate by one of the german institutes, so whatever calories he states I burned, I am more likely to believe. Still, not 100% accurate, but closer to, than any other device I would ever trust.
As I said - for precise metrics, you need to go one of these places where elite athletes go and this is not something you put in your pocket or on your wrist.
So point here is - enjoy what you have and to answer your question - probably your real burnt calories are somewhere in the middle or around what both devices measured.
Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
Best Answer
