Turn your reps and RPE into a percentage of your max, and back into an estimated 1RM.
RPE rates how hard a set felt on a scale up to ten. An RPE of ten means nothing left in the tank, while an eight means you could have done two more reps, so RPE eight equals two reps in reserve. This calculator maps your reps and RPE onto the percentage of your one rep max you just handled, using the standard reps in reserve chart lifters have relied on for years.
Add the weight you used and it also back calculates your estimated one rep max, so a single tracked set tells you both how hard it was and what your true ceiling looks like.
Fixed percentages ignore the day. Sleep, stress and food all move what a given weight feels like. Autoregulating with RPE keeps the effort honest, so you push when you are fresh and back off when you are not, which is exactly how the SUUPR engine adjusts your loads over time.
RPE is rate of perceived exertion on a scale to ten. RPE ten is a true maximal effort with nothing left, and each half point below that is roughly one more rep you had in reserve.
Match your rep count and RPE on the reps in reserve chart. For example five reps at RPE eight sits around eighty one percent of your one rep max. This calculator does the lookup for you.
For most lifters, yes. RPE adjusts to how you feel that day, so you avoid grinding a fixed percentage when tired or leaving progress on the table when fresh.
