RPE Calculator
Estimate your 1RM from weight, reps, and RPE. Get personalized load recommendations for your training.
Enter your lift details to estimate your 1RM.
RPE Scale
- RPE 10: Maximum effort, no reps left
- RPE 9.5: Could do 1 more rep with perfect form
- RPE 9: Could do 1 more rep
- RPE 8.5: Could do 1-2 more reps
- RPE 8: Could do 2 more reps
- RPE 7: Could do 3 more reps
- RPE 6: Could do 4 more reps
Calculation Method
Formula: 1RM = Weight ÷ Percentage
Where: Percentage comes from RPE chart
Example: 225 lbs × 5 reps @ RPE 8
Chart shows 79.3% for 5 reps @ RPE 8
1RM = 225 ÷ 0.793 = 284 lbs
What is RPE?
RPE (Rate of Perceived Exertion) is a scale from 1-10 that measures how hard an exercise feels. In strength training, it's used to gauge how many more reps you could perform with good form.
How accurate is the RPE calculator?
RPE-based 1RM estimates are generally accurate within 5-10% when used properly. Accuracy improves with experience using the RPE scale and consistent form.
What rep range works best?
RPE calculations are most accurate in the 3-8 rep range. Very low reps (1-2) and high reps (10+) can be less reliable due to technique breakdown or cardiovascular limitations.
How do I use RPE in training?
RPE allows for autoregulation - adjusting training loads based on daily readiness. Instead of fixed percentages, you can hit target RPE ranges for more flexible programming.
What about different exercises?
RPE charts work best for compound movements like squat, bench, and deadlift. Isolation exercises may not follow the same patterns due to different fatigue mechanisms.
Should I test my actual 1RM?
RPE estimates are safer and less fatiguing than true 1RM testing. Reserve actual 1RM attempts for competition or specific testing phases with proper preparation.