1RM Calculator

1RM Calculator

One Rep Max & RPE Calculator

116 ratings
18 reviews
Free
In-App Purchases

Details

  • Released
  • Updated
  • May 10, 2021
  • October 5, 2026

Features

1RM Calculator screenshot #1 for iPhone
1RM Calculator screenshot #2 for iPhone
1RM Calculator screenshot #3 for iPhone
1RM Calculator screenshot #4 for iPhone
1RM Calculator screenshot #5 for iPhone
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About

Easily calculate your one-rep max (1RM) strength with this app. It supports RPE input and allows you to estimate rep maxes based on your 1RM. Track your progress by saving your 1RM history for different exercises.

✓1RM calculation with RPE
✓Rep max estimation
✓Save 1RM history
✓Customizable exercises
✓Dark theme
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What's New in 1RM Calculator

1.8.0

October 5, 2026

- Training weights: Calculate working weights from a % of your 1RM or RPE, and see which plates to load on the bar. - Tap your 1RM estimate to see how it was calculated and how reliable it is. - Tap any record in History to see its estimated rep maxes.

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Subscriptions & In-App Purchases

1 Rep Max Pro Monthly

Full Access

$1.991 Month
How to cancel 1RM Calculator subscription ⁉️

User reviews

New update looks worse

I think the UI took a step back, but still a fan overall.

Clean, simple interface. No data collected. Minimal unobtrusive ads. There’s nothing not to like here.

Nice But….

Need to be able to change date of entry. I have some past lifts that I want to enter but can only enter as current date and don’t see where date of lift can be changed.

Good but

Lost all my data from last year 🙁

My opinion

I have used this app to find my one rep maxes and now I look like Ronnie Cole man in his prime

Simple and easy rep tracker

I love how simple this app is. I have been using it for ages, after having tried allot of other apps. I train hybrid, doing CrossFit and weight training and cardio and I use this all the time to track my exercice weights and reps.

I have 2 suggestions to improve the app :
- 1 : include a search engine in the exercice tab because I have so many exercices logged that it’s hard to find quickly
- 2 : enable renaming an exercise for example I misspelled one exercise and I can’t correct it without losing what I tracked
Thanks allot !
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Developer apps

FAQ

What is this app used for?

This app is designed to help you calculate your one-rep max (1RM) strength. It allows you to input your lifting data, optionally using Rate of Perceived Exertion (RPE), to estimate your maximum weight for a single repetition. You can also estimate your rep maxes for various rep ranges based on your calculated 1RM.

How does the 1RM calculation work?

The app calculates your 1RM based on the weight you lift and the number of repetitions you perform. You can optionally include your RPE to refine the calculation. It also provides estimations for rep maxes, allowing you to see how much you might be able to lift for 2 to 12 reps.

Can I track my progress over time?

Yes, the app allows you to save your 1RM history for each exercise you track. This feature enables you to monitor your strength gains and see how your performance improves over time. You can also customize the exercises you want to track.

Is this app free to use?

The app is free to download and use, offering core functionalities for 1RM calculation and tracking. It also includes in-app purchases, which may unlock additional features or customization options beyond the basic functionality.

What devices is this app compatible with?

While specific device compatibility is not detailed, this is a mobile application, implying it is designed for smartphones and tablets. It is likely available on major mobile operating systems like iOS and Android. The description mentions a dark theme, suggesting a modern user interface.