Fat Burner 21


Simple datafield to accomodate a request by Susun.

This field calculates the fat calories burned depending on heart rate zone & calories. The following defaults are configured:
  • Z1: 9kcal burned = 1 gram of fat burned
  • Z2: 80% fat
  • Z3: 50% fat
  • Z4: 20% fat
  • Z5: 0% fat

In the settings you can:
  • opt to see Fat Burner (=default) / Carbs Burner / Fat Burner and Carbs Burner
  • finetune the percentages for each zone

(Advice : do to consume too much carbs per hour, the absolute maximum is 70g/hour)


  • Install the Data Field on your watch by clicking download in the Connect IQ store
  • Configure your watch to use the data field:
    • Choose the Activity Profile for which you wish to install this data field for (eg Running)
    • Choose Activity Settings
    • Choose Data Screens
    • Choose “Screen 1” (or another screen)
    • Choose field 1 (or any of the other fields)
    • Choose “Connect IQ”
    • Select “Fat Burner” from the list

The sequence on how to do the above things is a little bit different on each watch (you can find the buttons to press in the user manual of your device in the section “Customizing the data screens)”


You can configure how the app behaves in the application settings (via Garmin Express or Garmin Connect Mobile)

Support / Questions / Feature Requests

When you have questions preferably post this question in the forum support topic (you have to log in first with your garmin user name in the top right corner before you can make a reply to this post)


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  • Post in the comments section below!

21 thoughts on “Fat Burner

  1. Reply jitzan Sep 16,2019 19:36

    can i see the fat burn in percentage and not g?

  2. Reply Bogdan Feb 16,2020 20:41

    Hi, is there any way to increase the size of the font on screen? Thank you.

    • Reply Peter Feb 16,2020 21:05

      This data field is of the simple data field type where the font is chosen by the Garmin Software, so no not possible. However, I’ve also integrated the Fat Burner logic in my “All In One” data field, perhaps the font in that app is better readable for you?

  3. Reply Wesley Spratt May 4,2020 22:58

    hi, I like to think I am a data geek/freak but I can’t tell what this app does for me or how to personalize it. Is there a place I can read more about it?

  4. Reply Víctor Jun 15,2020 15:08

    Could you explain why there are 5 zones? What do I have to know to configure it? I have studied the maximum fat oxidation is at 60-70 % of my FC Max.

    • Reply Peter Jun 15,2020 15:12

      The 5 zones correspond to the 5 heart rate zones which you have in Garmin Connect. (So to get your numbers, see your zones on the Garmin Connect web site)

      • Reply Víctor Jun 16,2020 09:11

        Ok, then I have to put the 80 % (that you put in the second one) on the third zone because it is the 60-70 % of my FC Max. Is it ok?

      • Reply Víctor Jun 16,2020 09:22

        Sorry, now I understand you. I have this %: https://ibb.co/8zHbM87

        Could you help what % I have to put in your app now?

        • Reply Peter Jun 16,2020 09:35

          You can either leave it at the defaults that the app presents (I use it that way) or if you think the fat burn or carbs burn in a certain zone should be adjusted you can tweak it to your liking. For example if you want max fat oxidation at 60% you’d have to put the value to 1 for zone 2.

  5. Reply Paul E. Jul 14,2020 14:01

    Thank you for taking the initiative to create this app!

    Some labs offer performance diagnostic tests that give you an exact burn rate of carbs and fat as a function of power output (which one could relate to heart rate). This carb:fat ratio depends on your individual metabolic profile and can change a bit with time depending on the type of training you do. Nonetheless, the default estimates already give approximate values that should work well enough.

    For athletes with a power meter (mostly cyclists, but nowadays also runners) it would be really great to add the option in the app to define the carb:fat ratios using power zones instead of heart rate. The burned calories can be more accurately calculated using power. Moreover, if one has personalized carb & fat burn rates (from test mentioned above) it could become accurate enough to really fine-tune fueling.

  6. Reply Kiran Aug 22,2020 11:34

    Thanks for creating this neat app.

    How do you have total burnt grains of fat/carbs in the file instead of graph? Is it possible to have both?

    Thanks for your reply Peter.

  7. Reply JohnPaul Aug 27,2020 00:03

    Can I see details from my walk earlier today either in Garmin connect or somewhere else?

    • Reply Peter Aug 27,2020 06:30

      if you indicate in the app settings to record fat / record carbs then this data is written to the fit file and as a result visible in the activity summary on Garmin Connect Web.

  8. Reply Fabio Jan 24,2021 22:33

    I see that is possible change Kcal/g for fat and for carbs, but is not possibile put value in decimals, so I can not write 9.14Kcal/g for fat and 3.81 for carbs: why?

  9. Reply Proximus Apr 6,2021 11:59

    I have a question about this. I’m on keto, and i been on keto for more than 6 months where i already reached the fat-adaptation stage of solely burning fat for fuel. If im on a 0 carb diet, and all am i burning is fat/ketones, especially after fasting and running on an empty stomach, then do i count the “carbs burned” in this app as fat as well? Because i am no longer burning any carbs or have glycogen stores left.

  10. Reply Jon Aug 12,2021 12:39

    Good morning. I have a 4s and can’t seam to find the download app on my watch. Is there directions on how to find. It and view?


    • Reply Peter Aug 12,2021 13:28

      see installation section above or alternatively search on youtube for: vivoactive 4 edit data fields

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