Overcalculation of calories burnt

[happyorganist]

I’ve been using Fitbit for over a year and a half, I’ve had an Inspire 3 for a little over a year, I’ve had a lot of frustration losing weight, and I realized that something wasn’t adding up when I started using Fitbit’s deficit plans. I decided to test them out and I found out that I only lost 0.7 pounds in a week with the 1,000 calorie deficit plan, and I gained 0.8 pounds in a week with the 250 calorie deficit plan, and 1.3 pounds in a week with the 0 calorie deficit plan. I decided to do the math and add up all of the calories I’ve consumed, and all of the calories that Fitbit says I’ve burnt. Approximately, I burn 660 calories less than what Fitbit tells me, so I only burn 340 calories with Fitbit’s 1,000 calorie deficit, and the 0 calorie deficit, 250 calorie deficit, and 500 calorie deficit only leads to me gaining weight. What gives? How can I fix this?

[CrisVillaFitbit]

Welcome to the Fitbit Community, @happyorganist.

Thank you for letting me know about this situation with the calories burnt calculation of your Inspire 3.

Fitbit devices combine your basal metabolic rate (BMR)—the rate at which you burn calories at rest to maintain vital body functions (including breathing, blood circulation, and heartbeat)—and your activity data to estimate your calories burned. If your device tracks heart rate, your heart-rate data is also included, especially to estimate calories burned during exercise. The number you see on your Fitbit device is your total calories burned for the day.

The calculation is done in this way, this number can change and will probably vary depending on which way you calculate it too. I recommend you to check this article to get more information.