Another fitbit one!

jasmine_belle

I'm trying to work out how accurate my fitbit has been in the last month and wondered if anyone who's good at maths could help please?

I'm set at a 0.5lb a week loss.

I track my weight on Libra and in the last 31 days I've lost 3.7 pounds.

How can I use my figures from mfp and fitbit to work out how accurate it is?

My brain is stuggling to work it out!

jasmine_belle

Ok I'm really confused now.

Over the last 31 days I've logged 65,753 calories on mfp (average 2121 per day).

Fitbit says I've burned 64,937 calories over the last 31 days (average 2094 per day).

That means I should be gaining? But I've lost, so fitbit is underestimating calories burned right?

Maxxitt

I had a fitbit one for about 3 years, and it did underestimate calories burned a bit. Your own data - calories in/weight lost is really the best estimate. If you want to slow your rate of loss, up your calories a bit (I would suggest starting with 100/day, or 700/week for the next month) and then re-assess.

jasmine_belle

Thank you for your reply. It's really interesting looking back over the data, once I get my head round the calculations! I'll keep going for another month and see how it goes.