# 1RM Max Calculator — 7 proven formulas for lifting

> Calculate one-rep max (1RM) for major lifts using 7 scientific formulas. (iPhone/iPad app by Kazumasa Shimomura.)

- Source: https://appshunter.io/ios/app/1rm-max-calculator/id1110502852 (this page in markdown: same URL + `.md`)
- Developer: [Kazumasa Shimomura](https://appshunter.io/developer/1110502851)
- Category: Health & Fitness, Utilities
- Price: Free with in-app purchases
- Rating: 4.20/5 from 22 App Store ratings · 27 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.6 · 10 MB
- Languages: American English, Japanese
- Released: 2016-05-05
- Data updated: 2026-08-23
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/1rm-max-calculator/id1110502852/reviews.md

## What is 1RM Max Calculator?

Accurate 1RM calculation using 7 scientific formulas

Calculate your maximum weight for bench press, squat, and deadlift instantly!
Using the average of 7 different proven formulas (Epley, Brzycki, Lander, and more) trusted by professional athletes to determine the most reliable 1RM.

[Why choose this app?]
- High-precision 1RM calculation using multiple formulas
- Simple and intuitive interface
- Comprehensive progress tracking
- Data visualization for growth monitoring

[Key Features]
- Support for 3 major lifts (bench press, squat, deadlift)
- 7 scientific calculation formulas for precise results
- Calendar function for daily record management
- Graph display for progress visualization
- One-tap data saving
- Full offline functionality

[Perfect for]
- Athletes wanting to track training effectiveness
- Lifters needing accurate 1RM calculations
- Anyone planning structured training programs
- Fitness enthusiasts tracking their progress

Make your training more scientific and effective.
Take your lifting to the next level!

Trusted by over 7,000 users worldwide.

## Key features

- 7 scientific 1RM calculation formulas
- Supports bench press, squat, and deadlift
- Progress tracking and data visualization
- Calendar for daily record management
- One-tap data saving
- Offline functionality

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Calculator for deadlift | $0.99 | one-time |
| Calculator for squat | $0.99 | one-time |
| Ad Blocker | $0.99 | one-time |


## Recent user reviews (10 of 27)

All indexed reviews: https://appshunter.io/ios/app/1rm-max-calculator/id1110502852/reviews.md

### 5/5 — Great tool

*2024-09-11*

Simple to use and is a great training tool.

**Developer response:** Thank you for using 1RM Max Calculator and for your kind review. We are glad the app is useful for you, and we will keep improving it.

### 5/5 — Best App Ever

*2024-07-01*

I’ve personally used 7 different maximum lift calculator apps. This is the only app that I will trust when calculating an anticipated maximum bench press. It has yet to fail me. For example, with no spotter (with safety catches) I easily benched 235 x 8. Within the next few days I benched 282 with relative ease.

**Developer response:** Thank you for using 1RM Max Calculator and for your kind review. We are glad the app is useful for your training, and we will keep improving it.

### 2/5 — 修正できない

*2024-05-09*

間違えて入力したとき修正できないのがどうにかしてほしい

**Developer response:** ご返信が大変遅くなり申し訳ございません。1RM Max Calculatorをご利用いただきありがとうございます。間違えて入力した内容を後から修正できないとのことで、ご不便をおかけし申し訳ございません。入力後に編集できる導線や、修正方法が分かりやすくなる画面改善を確認・検討してまいります。再入力などでお困りの点があれば、アプリ内サポートから詳細をお知らせください。

### 3/5 — 便利

*2024-01-07*

でも、間違った時消せないのが残念。

**Developer response:** ご返信が大変遅くなり申し訳ございません。1RM Max Calculatorをご利用いただきありがとうございます。便利と感じていただけた一方で、入力を間違えた時に消せない点でご不便をおかけし申し訳ありません。記録の削除や修正方法が分かりやすくなるよう、操作導線の改善を検討してまいります。発生した画面や操作手順が分かる場合は、サポートまでお知らせください。

### 3/5 — 逆も欲しい

*2023-11-08*

1repのmax重量から10repや8repの重量計算も欲しいです。 また、過去の記録のついかきのうが欲しいです

**Developer response:** ご返信が大変遅くなり申し訳ございません。1RM Max Calculatorをご利用いただきありがとうございます。MAX計算の表記や逆算、グラフ表示に関するご要望をありがとうございます。トレーニングの記録や目標設定に役立つ改善として、今後の機能追加候補にいたします。

### 2/5 — MAX計算の表記追加希望！

*2022-03-12*

重量・回数に追加でセット数も追加して頂きたいです！

**Developer response:** ご返信が大変遅くなり申し訳ございません。1RM Max Calculatorをご利用いただきありがとうございます。重量・回数に加えてセット数も入力や表示に追加してほしい、というご要望を確認しました。記録内容をより実際のトレーニングに合わせられるよう、今後の改善候補として検討いたします。具体的に見たい表示形式や使い方がありましたら、サポートまでお知らせください。

### 3/5 — 削除したい

*2020-09-13*

うっかり種目を間違えて保存してしまったのですが、削除できないようです。削除機能が欲しいです。

**Developer response:** ご返信が大変遅くなり申し訳ございません。1RM Max Calculatorをご利用いただきありがとうございます。誤って別の種目で保存した記録を削除できず、削除機能が欲しいとのこと、ご不便をおかけし申し訳ございません。記録の削除や修正の導線を確認し、今後の改善として検討いたします。ご利用状況の詳細があればサポートまでお知らせください。

### 5/5 — お！

*2020-07-20*

最高！

**Developer response:** ご返信が大変遅くなり申し訳ございません。1RM Max Calculatorをご利用いただきありがとうございます。嬉しいレビューをいただき、とても励みになります。今後も快適に使っていただけるよう、細かな改善を続けてまいります。

### 5/5 — 使いやすい

*2020-06-03*

無料なのに使いやすくて好きです。

**Developer response:** ご返信が大変遅くなり申し訳ございません。1RM Max Calculatorをご利用いただきありがとうございます。嬉しいレビューをいただき、とても励みになります。今後も快適に使っていただけるよう、細かな改善を続けてまいります。

### 5/5 — 新機能

*2020-01-05*

ベンチプレスのMAX計算法と
スクワットデッドリフトのMAX計算法って違うんですか？

**Developer response:** MAXの計算方法は同じです！
ですが、計算の微調整に利用する補正係数があるので、今後ベンチプレスやスクワットなどそれぞれ別に設定できる最適化機能を追加しようと思っています。

## Frequently asked questions about 1RM Max Calculator

### What does the 1RM Max Calculator app do?

This app helps you accurately calculate your one-rep max (1RM) for key lifts like bench press, squat, and deadlift. It utilizes 7 different scientific formulas to provide reliable estimates of your maximum weight capacity.

### What are the key features of the 1RM Max Calculator?

Key features include support for 3 major lifts, 7 scientific calculation formulas, comprehensive progress tracking with data visualization, a calendar function for record management, one-tap data saving, and full offline functionality.

### Is the 1RM Max Calculator app free to use?

The application is free to download and use, offering core functionality. It also includes in-app purchases, suggesting that some advanced features or content may be available for purchase.

### Who is the 1RM Max Calculator app designed for?

This app is perfect for athletes looking to track training effectiveness, lifters who need precise 1RM calculations, individuals planning structured training programs, and fitness enthusiasts monitoring their progress.

### Can I use the 1RM Max Calculator offline?

Yes, the app offers full offline functionality. This means you can calculate your 1RM, log your workouts, and track your progress even without an internet connection.

## Version history (last 5 releases)

### 3.5.0 — 2026-05-18

- Added a setting to choose the calculation method
- Added support for Conservative and Standard calculation modes
- Results now update based on the selected calculation method

### 3.4.1 — 2026-05-06

- Improved stability and usability
- Minor updates help keep the app running smoothly

### 3.4.0 — 2026-05-05

- Added a new survey feature.
- App stability has been improved.

### 3.3.0 — 2026-05-03

- Improved app stability.

### 3.2.0 — 2026-02-13

- App stability has been enhanced.

## Apps similar to 1RM Max Calculator

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Simple Workout Tracker: MUSCLY](https://appshunter.io/ios/app/simple-workout-tracker-muscly/id6446846782) | 5.0 (2) | Free | Health & Fitness |
| [Workout Log KINNIK: AI Advisor](https://appshunter.io/ios/app/workout-log-kinnik-ai-advisor/id1614375240) | 5.0 (1) | Free | Health & Fitness |
| [Hypertrophy App - Hyper](https://appshunter.io/ios/app/hypertrophy-app-hyper/id6504056922) | 4.0 (2) | Free | Health & Fitness |
| [Workout Log App - Overload+](https://appshunter.io/ios/app/workout-log-app-overload-plus/id6745340641) | — | Free | Health & Fitness |
| [Gym get-fit workout Diary](https://appshunter.io/ios/app/gym-get-fit-workout-diary/id1109688815) | 4.8 (94) | Free | Health & Fitness |
| [MyBIG3 - Workout Log App](https://appshunter.io/ios/app/mybig3-workout-log-app/id6745771123) | — | Free | Health & Fitness |

## More apps by Kazumasa Shimomura

- [Let's お絵描き](https://appshunter.io/ios/app/lets/id1116030383)
- [BPM Measure: Tap & Analyzer](https://appshunter.io/ios/app/bpm-measure-tap-and-analyzer/id1123366285)
- [TRANS BLUE](https://appshunter.io/ios/app/trans-blue/id1152536999)
- [Simple Shift Calendar](https://appshunter.io/ios/app/simple-shift-calendar/id1157592530)
- [Shift management app!](https://appshunter.io/ios/app/shift-management-app/id1169500173)

All apps by Kazumasa Shimomura: https://appshunter.io/developer/1110502851

## Related topics

[1rm max calculator](https://appshunter.io/ios/topics/1rm-max-calculator)

---

*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.*