Check out this chart to compare heart rate and RPE.
|zone||power (% of FTP*)||H/R (% of FTHR*)||Rate of Perceived Effort(3-20)||Effort Level|
|Recovery||1||<55%||<72%||<6||VERY EASY – You should be working and sweating but not a big effort. It should be very easy to carry on an uninterruped conversation|
|Easy Endurance||2||56-75%||77-83%||7-11||CONVERSATIONAL – An effort you can sustain for an extended period of time without fatigue. Slightly interruped conversation.|
|Medium Endurance||3||76-90%||82-94%||12-14||STRONG, NOT BREATHLESS – Effort is strong but sustainable for an extended period of time. Comparable to half-marathon or Half-Ironman® Pace.|
|Threshold||4||91-105%||95-105%||15-17||HARD – This is your maximum steady, sustainable effort. You should be able to hold this for several minutes. Not a comfortable pace.|
|Power||5||106-130%||>106%||18+||VERY HARD – This is an effort or speed you can hold for only several seconds to a very few minutes. This zone includes all high end speed work.|