Estimate Your 1RM from Weight, Reps, and RPE
Enter your lift details to calculate your estimated one-rep maximum
Estimate Your 1RM from Weight, Reps, and RPE
Enter your lift details to calculate your estimated one-rep maximum
lbs
Estimated 1RM
Enter your lift details to estimate your 1RM.
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How to Use This Calculator
Step-by-step guide to get accurate results
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RPE Calculator: What It Is and How to Use It
An RPE (Rate of Perceived Exertion) Calculator helps measure workout intensity and estimate your strength. By entering weight lifted, repetitions, and perceived effort, it calculates your estimated one-rep max (1RM) and suggests recommended training loads. It’s ideal for fitness enthusiasts, lifters, powerlifters, and trainers looking to train safely, effectively, and progressively.
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How to Use the RPE Calculator
Enter Weight Lifted
Input the weight of your set (kg or lbs).
Enter Repetitions
Number of reps completed for the set.
Select RPE
Rate how hard the set felt on a scale from 1–10.
Click Calculate
View estimated 1RM and recommended training loads.
Adjust Workouts
Use the results to plan intensity and progression.
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Key Features
1RM Estimation
Converts weight, reps, and RPE into estimated maximum strength.
Load Recommendations
Suggests weights for target intensity levels.
Autoregulated Training
Adjust daily workouts based on perceived effort.
Free & Mobile-Friendly
Works on any device without registration.
Safe Training
Avoid unnecessary max lifts while tracking progress.
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Who Can Benefit
Strength Training
Plan intensity for progressive overload.
Powerlifting
Estimate max lifts safely without going to failure.
Autoregulated Workouts
Adjust daily loads based on effort.
Coaching
Trainers can plan and monitor client loads accurately.
Rehabilitation & Recovery
Manage stress to prevent injury and overtraining.
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Example Calculations
Example 1
Weight: 100 kg | Reps: 5 | RPE: 8 → Estimated 1RM: 118 kg
Example 2
Weight: 120 kg | Reps: 3 | RPE: 9 → Estimated 1RM: 129 kg
Frequently Asked Questions
What is an RPE Calculator?
It estimates strength and workout intensity using weight, repetitions, and perceived exertion.
Is it free?
Yes, it’s completely free online.
Do I need software?
No, it works directly in any browser.
Can it calculate 1RM?
Yes, based on the weight, reps, and RPE you enter.
Can it plan workout intensity?
Yes, it recommends training loads for target RPE levels.
Is it suitable for beginners?
Yes, it works for all fitness levels.
How accurate is it?
It’s accurate when inputs are consistent and correct.
Can it prevent injury?
Yes, by avoiding unnecessary max lifts and overtraining.
Does it support kg and lbs?
Yes, both units are accepted.
Can coaches use it for clients?
Yes, it’s perfect for monitoring and planning client workouts.
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How the RPE Calculator Works
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