# Intervals.icu eFTP **URL:** \ **Category:** Results\ **Tags:** ftp-increase\ **Created:** [June 1, 2020, 12:52pm UTC](https://www.trainerroad.com/forum/t/intervals-icu-eftp/36899 "2020-06-01T12:52:11Z")\ **Posts on this page:** 1\ **Showing post:** 15
**Author:** ![davidtinker](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/davidtinker/32/17576_2.png) [@davidtinker](https://www.trainerroad.com/forum/u/davidtinker)\ **Post date:** [June 1, 2020, 8:23pm UTC](https://www.trainerroad.com/forum/t/intervals-icu-eftp/36899/15 "2020-06-01T20:23:53Z")
Yes if your short duration power is very good Intervals.icu will overestimate your FTP. You can set the minimum duration that it will use in /settings. Maybe you should go with 7 or 8 minutes. How it works, short version: It is essentially a generalisation of the 95% of 20m power rule of thumb to any duration from 3 minutes to about 30 minutes. So you just have to do one max effort of any reasonable duration to get an eFTP number. Long version: Intervals.icu looks for points on your power duration curve of at least 180s (configurable) that indicate that you should be on a higher curve that then one for your current eFTP. If an effort puts you on a higher curve then your eFTP (from the power model parameters for that curve) goes up. If it does not then it wasn’t a max effort and is ignored i.e. your eFTP is left alone. Your eFTP will decay slowly if you reduce your training load and then you need to go do a max effort to get a new number. --- _[View the full topic](https://www.trainerroad.com/forum/t/intervals-icu-eftp/36899)._