# 1RM Calculator — One Rep Max Strength

> Calculate and track one-rep max strength with RPE support. (iPhone/iPad app by Yuri Koshiishi.)

- Source: https://appshunter.io/ios/app/1rm-calculator/id1566775126 (this page in markdown: same URL + `.md`)
- Developer: [Yuri Koshiishi](https://appshunter.io/developer/1566775128)
- Category: Health & Fitness, Sports
- Price: Free with in-app purchases
- Rating: 4.90/5 from 109 App Store ratings · 17 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 32 MB
- Languages: American English
- Released: 2021-05-10
- Data updated: 2026-08-23
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/1rm-calculator/id1566775126/reviews.md

## What is 1RM Calculator?

An easy-to-use 1RM calculation app that lets you use RPE and track your 1RM history.

The core functionalities include:

- 1RM calculation with RPE (optional).
- Rep maxes estimation from 2 to 12 reps, according to your estimated 1RM.
- Saving 1RM history by exercise.
- Customized exercise selection.
- Dark theme available.

Terms & Conditions
https://1rm-calculator.netlify.app/legal/terms/

## Key features

- 1RM calculation with RPE
- Rep max estimation
- Save 1RM history
- Customizable exercises
- Dark theme

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| 1 Rep Max Pro Monthly | $1.99 | per month |
| 1 Rep Max Pro Annual | $9.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 1 Rep Max Pro Lifetime | $29.99 | one-time |


## Recent user reviews (10 of 17)

All indexed reviews: https://appshunter.io/ios/app/1rm-calculator/id1566775126/reviews.md

### 4/5 — Nice But….

*2025-04-04*

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.

### 5/5 — Good but

*2025-02-06*

Lost all my data from last year 🙁

### 5/5 — My opinion

*2024-12-02*

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

### 5/5 — Simple and easy rep tracker

*2024-11-22, version 1.4.0*

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 !

### 5/5 — Perfect

*2024-11-16*

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

### 4/5 — Good app

*2024-09-06*

I was looking for an app like this, and finally I found something that will help me with my workouts
I wanna start 5x5 Jason Blaha program

### 4/5 — Great for tracking big lifts

*2024-05-15*

I would give it 5 stars if it had a graph to show progress of the lifts. Also needs to be able to edit unlimited customized lifts.

### 5/5 — Awesome App

*2024-05-10*

It helps me determine a path to strength growth without always using maximum weight which if not lifted strictly with a partner could injure me! At 68 years old injuries are not my friend!

### 5/5 — Muy chévere

*2024-05-01*

La voy a probar a ver qué tal

### 5/5 — 最高です！

*2023-10-25*

使いやすく、記録も保存できて最高です。種目の並び替えができたらもっと最高だと思いました。

## Frequently asked questions about 1RM Calculator

### 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.

## Version history (last 5 releases)

### 1.6.2 — 2025-02-12

- Expanded language support: French, Portuguese, German, Italian, Russian, Korean.

### 1.6.1 — 2025-02-07

- Added a search input to filter exercises.
- Added a chart to show 1RM progress over time.
- Added a table to show rep maxes for each lift.

### 1.4.0 — 2024-10-25

- Minor improvements & bug fixes.

### 1.3.2 — 2024-04-30

- Improved 1RM calculation logic.
- Added Spanish language support.

### 1.3.1 — 2023-12-28

- Enhanced stability and security.

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## More apps by Yuri Koshiishi

- [Gym Workout Tracker Log - Wise](https://appshunter.io/ios/app/gym-workout-tracker-log-wise/id1662348638)
- [Hypertrophy App - Hyper](https://appshunter.io/ios/app/hypertrophy-app-hyper/id6504056922)
- [Venting App - Sodan AI](https://appshunter.io/ios/app/venting-app-sodan-ai/id6746691748)

All apps by Yuri Koshiishi: https://appshunter.io/developer/1566775128

## Related topics

[1rm calculator](https://appshunter.io/ios/topics/1rm-calculator) · [1rm max calculator](https://appshunter.io/ios/topics/1rm-max-calculator) · [1rm weight lifting rep max](https://appshunter.io/ios/topics/1rm-weight-lifting-rep-max) · [max rep calculator](https://appshunter.io/ios/topics/max-rep-calculator) · [bench rep](https://appshunter.io/ios/topics/bench-rep) · [rep calculator](https://appshunter.io/ios/topics/rep-calculator) · [1rm](https://appshunter.io/ios/topics/1rm) · [powerlifting calculator](https://appshunter.io/ios/topics/powerlifting-calculator)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*