Fitbit Blaze burned calories accuracy

[StacyDonelle]

Hi, I wear my blaze while riding my Peloton bike. I just did a 45 minute ride and the peloton told me I burned 426 calories (I don’t have a HR monitor hooked to the bike). The Blaze told me I burned 663. I’d like to know which is likely closer to the actual number. I hope it’s the Blaze 🙂

Moderator edit: Clarified subject

[FerdinandFitbit]

Hi there @StacyDonelle. Great to see you in the Community Forums! 🙂

Now, unless you're able to compare it to manually measuring your heart rate right in the middle of your exercise session, it would be a little hard to tell which one is right. I can however, provide some tips to make sure you get the most accurate heart rate readings from your Fitbit Blaze. 

When you’re not exercising, wear your device a finger’s width below your wrist bone. Fitbit’s PurePulse heart-rate tracking system is designed to be most accurate when the device is worn on the top of your wrist.

For improved heart-rate accuracy keep these tips in mind:

1. Experiment with wearing the device higher on your wrist during exercise for an improved fit and more accurate heart-rate reading. Many exercises such as bike riding or weight lifting cause you to bend your wrist frequently, which could interfere with the heart-rate signal if the watch is lower on your wrist. 
   
2. Make sure the device is in contact with your skin.
3. Do not wear your device too tight; a tight band restricts blood flow, potentially affecting the heart-rate signal. That being said, the device should also be slightly tighter (snug but not constricting) during exercise than during all-day wear.
4. With high-intensity interval training, P90X, boxing, or other activities where your wrist is moving vigorously and non-rhythmically, the movement may prevent the sensor from finding an accurate heart rate. Similarly, with exercises such as weight lifting or rowing, your wrist muscles may flex in such a way that the band tightens and loosens during exercise. Try relaxing your wrist and staying still briefly (about 10 seconds), after which you should see an accurate heart-rate reading. Note that your device will still provide accurate calorie burn readings during these types of exercise by analyzing your heart rate trends over the course of the workout.

Hope this helps and if you need anything else, I'm here to help!