[SOLVED] Form : Wrong calculation on fitness curve

Hello everyone. I noticed an error in calculating the “form”.
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As you can see, Fitness “31” minus Fatigue “52” should give “-21” and not “-68”

Of course, I compared the data on 2 other tracking applications. (Nolio and Elevate). The Fitness and Fatique values ​​are approximately equivalent and the fitness calculation is correct.

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Do you have any idea where this calculation error could come from and how to correct it?
I specify that I checked the FTP data.
Also, I didn’t find this problem on the forum.
I use the Microsoft Edge browser and this error also appears using Google Chrome.
Thanks to all

Hi Serge. I think you mixed up absolute values with percentages.
Form = (Fitness-Fatigue)/Fitness
Form= (31-52)/31=0.677…=68%

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As @fwagner has said, you are using % of fitness. You can change between % and absolute using the options menu on the fitness page.

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ok Gerald. Thank you for the clarification. I understood now.
I’m a beginner with interval.icu and I had no idea that it was possible to choose another scale to display the shape. I stuck with the presentation of the PSC of “Training Peaks” and am used to interpreting the curves according to Joe Friel’s recommendations.
All other platforms to which I subscribe (Training Peaks, Nolio, Elevate) give the raw form value without any other possibility of change.
So it was a little confusing because I hadn’t made any special settings since installing the software. Honestly, for the moment, I don’t really understand the point of having the form in % form.

I have a lot to discover in this software. Mainly the tools to measure your own progress and above all knowing how to interpret all this data with relevance.

Thanks again

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Good morning. Thank you for your reply.
At the very beginning, I did not understand the meaning of your answer, not knowing that it was possible to modify the calculation, either in raw form or in % form.
I am currently discovering this software.
All other platforms to which I subscribe (Training Peaks, Nolio, Elevate) give only the raw form value without any other possibility of change.
So it was a little confusing because I hadn’t made any special settings since installing the software and I thought that the calculation should be identical to the others.
Honestly, for the moment, I don’t really understand the point of having the form in % form.
Now I have left the overload zone -:slight_smile:

gerald’s answer helped me understand and by modifying the calculation scale, everything was consistent with other platforms.

This software is a gold mine to discover. Thank you for your contribution

This post explains the difference between Absolute/% values and why it was introduced:

Make sure to read the other Guide topics ‘a guide to to getting started’. They provide lots of tips and advice for new users.

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This post explains the difference between Absolute/% values and why it was introduced:

Make sure to read the other Guide topics ‘a guide to to getting started’. They provide lots of tips and advice for new users.

1 Like

I was going to recommend that you read the guides, but @MedTechCD has already mentioned it.

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