EVOX1RM Calculator & PR Tracker
Calculate your one rep max using the Epley formula. Track personal records for 29+ exercises. Built for CrossFit athletes and weightlifters. All included in EVOX, free on iOS & Android.
Try the 1RM Calculator
Enter a weight and rep count to estimate your one rep max using the Epley formula
The Epley Formula Explained
1RM = Weight × (1 + Reps / 30)The Epley formula is one of the most widely used methods to estimate your one rep max from a submaximal lift. It takes a weight you've lifted for multiple reps and predicts what you could lift for a single rep.
Why Epley?
Developed by Boyd Epley, this formula has been validated across numerous studies. It's simple, reliable, and works well for the most common rep ranges used in training (2-10 reps).
Limitations
The formula is most accurate between 2 and 10 reps. Above 10 reps, the estimation becomes less precise. For best results, use a weight you can lift for 3-5 reps with good form.
This is an estimation tool. Your actual 1RM may vary depending on fatigue, technique, and training conditions.
Everything You Need to Track Strength
A complete 1RM calculator and PR tracker built for serious lifters
1RM Calculator
Calculate your estimated one rep max using the proven Epley formula. Input weight and reps, get your 1RM instantly.
PR Tracking
Log personal records for every lift. See your progress over time with clear history and improvement indicators.
Percentage Charts
Instantly see training percentages from 50% to 100% of your 1RM. Perfect for percentage-based programming.
29+ Exercises
All major lifts covered: snatch, clean & jerk, back squat, front squat, deadlift, bench press, overhead press, and more.
Progress History
Track your strength journey over weeks, months, and years. See trends and celebrate improvements.
Works Offline
All data stored locally on your device. No internet needed. Cloud sync available with a free account.
29+ Supported Exercises
Track PRs across all major lifts in weightlifting, strength training, and functional fitness
Olympic Weightlifting
- Snatch
- Clean & Jerk
- Clean
- Power Clean
- Power Snatch
- Hang Clean
- Hang Snatch
- Push Jerk
- Split Jerk
- Overhead Squat
Strength & Powerlifting
- Back Squat
- Front Squat
- Deadlift
- Bench Press
- Overhead Press
- Push Press
- Sumo Deadlift
- Romanian Deadlift
- Hip Thrust
- Pendlay Row
Functional Fitness
- Thruster
- Wall Ball
- Cluster
- Devil Press
- Turkish Get-Up
- Kettlebell Swing
- DB Snatch
- DB Clean & Jerk
- Farmer Carry
...and more exercises added regularly
Calculate Your 1RM in Seconds
Simple, fast, accurate — three steps to know your max
Enter Your Lift
Select the exercise, enter the weight you lifted and how many reps you completed.
Get Your 1RM
The Epley formula calculates your estimated one rep max. See percentages from 50% to 100%.
Save Your PR
Log the result as a personal record. Track your progress and celebrate every new PR.
Frequently Asked Questions
Everything about 1RM calculation and PR tracking
Still have questions?
Contact us →Track Your Strength Journey
Calculate your 1RM, track personal records, and see your percentage charts — all in one free app for CrossFit athletes and weightlifters.