Calculating LT Power (Power zones) | 80/20 Endurance

# Calculating LT Power (Power zones)

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• #12374
lmtrejo
Participant

Hi!

The 80/20 Triathlon book suggests that we find our rFTP using the following method:

“The basic formula to find your running FTP is:
(2,400 meter power × 2,400 meter time) − (1,200 meter power × 1,200 meter time) / (2,400 meter time − 1,200 meter time)”

But this site suggests that we do the 20-minute test, and then take 95% of that average power. My question is, which method is the best one for calculating rFTP? Thank you!

#12375
Matt Fitzgerald
Keymaster

Definitely the 20-minute TT.

#12387
wcmyhan
Participant

After doing the 20 minute test with my garmin 945 I am still not seeing any data showing my watts (power). Do I need to buy something extra to show power?

#12400
Matt Fitzgerald
Keymaster
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