# W bal estimation method?

**URL:** <https://forum.intervals.icu/t/w-bal-estimation-method/611>\
**Category:** Uncategorized\
**Created:** [2 April 2020 03:10 UTC](https://forum.intervals.icu/t/w-bal-estimation-method/611 "2020-04-02T03:10:20Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![david](https://forum.intervals.icu/user_avatar/forum.intervals.icu/david/32/30189_2.png) [@david](https://forum.intervals.icu/u/david)\
**Post date:** [21 September 2020 04:41 UTC](https://forum.intervals.icu/t/w-bal-estimation-method/611/6 "2020-09-21T04:41:26Z")

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Intervals.icu now estimates W’ on an individual basis. You don’t need to switch to Mortons 3P. The estimation is a lot more robust with respect to the power inputs.

> [@Power model now complete](https://forum.intervals.icu/t/power-model-now-complete/1680):
>
> Intervals.icu now estimates W’ (W prime) or anaerobic work capacity. This represents the amount of work you can do above threshold (FTP). Your eFTP, W’ and pMax (max power for 1 second) define the shape of your modelled power curve. This is useful for specifying workouts above FTP using % of MMP (mean maximal power) for a given duration. You can see your model curve for various durations on the /power page (click “Options” and tick “Show model power curve”). Currently W’ isn’t estimated on an …

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