E1RM Calculator

E1RM Calculator - Your Personal One-Rep Max Calculator & Sets Planner

Calculate your estimated one-rep max (1RM) with precision using the RPE (Rate of Perceived Exertion) method, and plan your entire training session with the built-in Sets Planner. Perfect for powerlifters, bodybuilders, and strength athletes who want accurate training data.

🏋️ KEY FEATURES

• RPE-Based 1RM Calculations
Use Rate of Perceived Exertion (RPE 6.0-10.0) for more accurate estimates than traditional formulas. This method accounts for how hard your set actually felt, giving you better results.

• Support for 1-10 Reps
Whether you're testing a true 1RM or working with higher rep sets, get accurate estimates from any rep range.

• Training Percentages
Instantly see your working weights at 60%, 65%, 70%, 75%, 80%, 85%, 90%, and 95% of your 1RM. Perfect for planning your training cycles.

• Custom Percentage Calculator
Need a specific percentage like 79% or 83%? Enter any custom percentage and get your exact working weight.

• Sets Planner
Plan your full training session from top set to last set. Set your top set, then add as many additional sets as you need. For each set, choose how to calculate the weight:
— RPE target: hit a specific RPE and the app calculates the weight for you
— Percentage: reduce or increase by a percentage from the previous set
— Specific weight: enter an exact weight
Copy your planned sets directly to your clipboard to share or log elsewhere.

• Configurable Units & Rounding
Choose between kg and lbs. Set your preferred rounding increment (2.5 or 0.5) and direction (default, always up, always down) so weights always match your available plates.

• Complete Privacy
No data collection, no tracking, no analytics. All calculations happen locally on your device. Your training data stays private.

📊 HOW IT WORKS

The RPE method is more accurate than traditional formulas (like Epley or Brzycki) because it considers how difficult the set felt:

1. Enter the weight you lifted
2. Enter how many reps you performed (1-10)
3. Select your RPE (how many reps you had left in the tank)
4. Get your estimated 1RM instantly

For example: If you squat 140 kg for 5 reps at RPE 8 (meaning you could have done 2 more reps), your estimated 1RM is approximately 172 kg.

🎯 PERFECT FOR

• Powerlifters planning their training cycles
• Bodybuilders tracking strength progression
• CrossFit athletes programming their workouts
• Strength coaches calculating training loads
• Anyone serious about strength training

💪 RPE SCALE GUIDE

RPE 10: Maximum effort - no reps left
RPE 9.5: Could do 1 more rep, maybe
RPE 9: Could definitely do 1 more rep
RPE 8: Could do 2 more reps
RPE 7: Could do 3 more reps
RPE 6: Could do 4 more reps

🔒 YOUR PRIVACY MATTERS

• Zero data collection
• No internet connection required
• No ads or tracking
• All calculations done locally
• Your information never leaves your device

📱 SIMPLE & EFFECTIVE

No complicated setup or unnecessary features. Open the app, enter your numbers, and get your results. Use the Sets Planner to build your entire session in seconds. Whether you're planning your next training block or just curious about your strength levels, E1RM Calculator gives you the data you need.

Download now and take the guesswork out of your training!

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Questions or feedback? We'd love to hear from you!

Note: This calculator provides estimates based on the RPE method popularised by strength coaches and trainers. Individual results may vary based on training experience, technique, and recovery.