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One Rep Max: 1RM Calculator

One Rep Max: 1RM Calculator

Strength Tracker & Gym PR Tool

170 ratings
53 reviews
With Ads
💪 Health & Fitness
⚽ Sports
Free
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Details

  • Released
  • Updated
  • December 30, 2014
  • June 28, 2026

Features

Developer

Charles Vanderhoff
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🧾$2.99 - $49.99
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About

Safely estimate your maximum lift potential for various strength exercises using scientific formulas. Track your progress visually, set goals, and fine-tune estimates with perceived exertion. Ideal for powerlifters, CrossFit athletes, and strength enthusiasts.

✓Precise 1RM calculations with 7 scientific formulas
✓RPE integration for fine-tuned estimates
✓Custom exercise tracking for any lift
✓Visual progress graphs
✓Percentage charts for training
✓Goal setting and progress monitoring
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What's New in One Rep Max

4.0.21

June 28, 2026

Back up your lifts. You can now sign in to securely back up your workout data and keep it synced across all your devices. Plus bug fixes and performance improvements.

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Subscription plans

1RM Pro Monthly

Analyze lifts, plate calculator & ad free!

$2.991 Month
7 Days trial
How to cancel One Rep Max subscription ⁉️
5

In-App Purchases

$49.99

1RM Pro Lifetime

Analyze lifts, plate calculator & ad free!

User reviews

Most RecentHighest RatedLowest Rated

Disappointed

Placing previously available features behind a paywall? Yeah, uninstalled.
Jewlius13Jewlius13

It does the job.

It definitely does the job. Was 5 stars then it put the percentages/reps behind a pay wall.
Concerned DonkeyConcerned Donkey

Best 1RM app I’ve used

Super clean and easy to use. I love that it supports multiple 1RM formulas and lets you track progress over time with charts. The plate calculator is a nice bonus. I’ve used a few lifting apps and this is the one I keep coming back to.
Charlie0001Charlie0001

Made it useless unless you pay a sub

Don’t hate them for it but it’s useless unless you pay a subscription. So yeah look for something else
MotherPreacherMotherPreacher

Free???

Is the app not free to use anymore? 😅
Cune123Cune123
See 48 more reviews

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FAQ

What is the One Rep Max: 1RM Calculator app?

This app helps you safely and accurately determine your maximum lift potential for various strength exercises like bench press, deadlift, and squat. It uses multiple scientific formulas to estimate your one-rep maximum based on your performance with submaximal weights, providing safe strength targets.

What are the key features of this strength tracker?

Key features include precise 1RM calculations using 7 scientific formulas, RPE integration to fine-tune estimates, custom exercise tracking for any lift, visual progress graphs, percentage charts for training, and goal setting.

How does the app calculate one-rep max?

The app employs multiple validated scientific formulas such as Epley, Brzycki, and Lombardi to estimate your one-rep maximum. These calculations are based on your performance with submaximal weights, offering a safer alternative to attempting maximal lifts directly.

Is this app compatible with all devices?

The provided data indicates the app is available on Apple's platform, suggesting it is compatible with iOS devices. Specific version compatibility is not detailed in the description.

Who would benefit from using this app?

This app is perfect for powerlifters optimizing training cycles, CrossFit athletes tracking multiple movement patterns, Olympic weightlifters monitoring progress, and any strength enthusiast looking to track their progress and set strength goals.