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Free

1RM Calculator with the Epley formula

Enter a weight and a rep count: you get your estimated max and your training percentages, in kg or lb. To log your PRs over time, the Evox app does it for free, no account needed.

Epley formula
29+ exercises
PR history
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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)

It takes a weight you lifted for several reps and predicts what you could lift for a single rep.

Why Epley?

Named after Boyd Epley, it is simple and holds up well on the rep ranges most people train with.

Limitations

Reliable between 2 and 10 reps; above 10, the estimate drifts. Best input: a weight you can lift 3 to 5 times 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

See your training loads from 50% to 100% of your 1RM at a glance, ready for percentage-based programs.

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

Three steps to know your max

1

Enter Your Lift

Select the exercise, enter the weight you lifted and how many reps you completed.

2

Get Your 1RM

The Epley formula calculates your estimated one rep max. See percentages from 50% to 100%.

3

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

The heaviest weight you can lift for one clean rep of a given exercise. Percentage-based programs use it to set your training loads.
1RM = weight × (1 + reps / 30). It is reliable between 2 and 10 reps and drifts beyond that; for the best estimate, use a weight you can lift 3 to 5 times with good form.
The calculator works for any lift. In the Evox app, you log PRs on Olympic lifts (snatch, clean & jerk), strength lifts (squat, bench, deadlift) and functional movements (thruster, wall ball, Turkish get-up).
They give the exact load for each percentage of your 1RM. When the whiteboard says 5×3 at 75% of your back squat, you read the number instead of doing the math.
No. The calculator runs right here with no account, and in the Evox app PR tracking and percentage charts are free, still without an account.

Still have questions?

Contact us →

Track Your Strength Journey

Calculate your 1RM, track PRs, read your percentage charts. All in one app for CrossFit athletes and lifters.

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