# 1RM

> Weightlifting calculator for one-rep max, lift comparison, and plate calculation. (iPhone/iPad app by Michael Galloy.)

- Source: https://appshunter.io/ios/app/1rm/id803666039 (this page in markdown: same URL + `.md`)
- Developer: [Michael Galloy](https://appshunter.io/developer/803666042)
- Category: Health & Fitness, Utilities
- Price: $0.99
- Rating: 4.33/5 from 3 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 7.0 · 2 MB
- Languages: English
- Released: 2014-02-04
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/1rm/id803666039/reviews.md

## What is 1RM?

1RM is a simple weightlifting calculator which takes the pain out of the normal calculations a lifter needs to make in the gym. It can:

* Determine one-rep maximum (selecting from various algorithms).
* Compare lift against standards.
* Easily determine percentages of maximum.
* Convert between pounds and kilograms easily.
* Determine/verify plates.

## Key features

- One-rep maximum calculation
- Lift comparison to standards
- Percentage of maximum calculation
- Pound/kilogram conversion
- Plate determination

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/1rm/id803666039/reviews.md

### 4/5 — Handy

*2014-04-20, version 1.3*

This app is a great tool. The one thing that could make this better would be the ability to add my own exercises to the list rather than just leaving it on "other". Add that feature, and I'd give this app 5 stars.

### 5/5 — Simple, yet loaded with features

*2014-04-09, version 1.3*

This app is good-looking and easy to use, yet it includes several advanced options, including different calculation methods. It's handy in the gym -- I can scroll and select with one thumb.

### 4/5 — Great App for Clients

*2014-04-09, version 1.3*

I have enjoyed using this app along with my clients. This gives them the ability to track their progress and allows me to ensure they are properly selecting their weight. This app needs the ability to add your own exercises and or change the name of the default exercises.

### 5/5 — Great App

*2014-02-25, version 1.1*

Easy to use and does just what it's supposed to do.

## Frequently asked questions about 1RM

### What is 1RM?

1RM is a weightlifting calculator designed to simplify gym calculations. It helps users determine their one-rep maximum, compare lifts against standards, and easily calculate percentages of their maximum.

### What algorithms does 1RM use for one-rep maximum calculation?

1RM supports various algorithms for determining your one-rep maximum. The app allows you to select from different methods to find the most suitable calculation for your needs.

### Can 1RM help with plate calculations?

Yes, 1RM can determine and verify the plates you need for your lifts. This feature helps ensure you're using the correct weight combinations at the gym.

### Does 1RM support both pounds and kilograms?

Yes, 1RM allows for easy conversion between pounds and kilograms. This ensures users worldwide can utilize the app regardless of their preferred unit of measurement.

### What devices is 1RM available on?

1RM is available on iPhone, iPad, and iPod. The app is designed to be compatible with Apple's mobile operating system.

### How often is 1RM updated?

The latest version of 1RM is 1.4, which was last updated on January 16, 2015. The app was initially released on February 4, 2014.

### What is the age rating for 1RM?

1RM has an age rating of 4+. This indicates it is suitable for a wide range of users, including younger individuals interested in fitness.

### What is the price of 1RM?

1RM is a paid application and costs $0.99. This one-time purchase grants you access to all of its weightlifting calculation features.

## Version history (last 5 releases)

### 1.4 — 2015-01-16

This app has been updated by Apple to display the Apple Watch app icon.

If you find 1RM useful, I would appreciate a review on the app store! In any case, please let me know how I can make the app better.

[NEW] New icon.

[NEW] Optional display of both kilograms and pounds.

[NEW] Optimized for iPhone 6/6 Plus.

### 1.3 — 2014-04-08

If you find 1RM useful, I would appreciate a review on the app store! In any case, please let me know how I can make the app better.

[NEW] Setting to turn off interface sounds.

### 1.2 — 2014-03-04

[NEW] Cycle through exercises by swiping left or right on the exercise button.

[NEW] Redesign of reps indicator. Circles are cool.

[NEW] Added front squat using 80% of the back squat as a standard.

[NEW] Showing range of reps for regular percentages rep scheme. If using regular percentages, i.e., 100%, 95%, 90%, etc., then the given reps is a range of values from the other rep schemes.

[NEW] Allow unit change while typing without conversion. After typing is finished, changing the units will convert the value, but while typing changing the units does not convert.

[NEW] Calculating Malone-Meltzer age adjusted Sinclair weight. Specify birthday in settings.

[NEW] Displaying % of WR for standard level for the snatch and clean & jerk.

[FIX] Bug fix for rounding errors on unit conversion. Converting from lbs to kg (or vice versa) and back should result in the original value.

[FIX] Slight adjustment of standards bar display. Displaying a level value 0 to 6 and moved the Elite level away from the right edge of the display. After reaching the Elite level, more weight does not cause the level to linearly increase, so it is impossible to fully reach a level value of 6.

[FIX] Rounding to nearest kg or nearest 5 lbs in table of percentages of one rep maximum.

[FIX] Fixed bug where weight/reps for last exercise was not always restored properly when starting app.

### 1.1 — 2014-02-13

* Minor update to app icon.

* Fix for hidden text field when keyboard appears on some devices in the
  settings.

* Saving last effort for every exercise.

* Adding snatch/clean and jerk and computing Sinclair adjusted weight.

* Prompting for lifter details on first launch.

### 1.0 — 2014-02-02

No release notes.

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## More apps by Michael Galloy

- [Simple Checklist : Repeat it](https://appshunter.io/ios/app/simple-checklist-repeat-it/id973818951)
- [Quantified Groceries](https://appshunter.io/ios/app/quantified-groceries/id1099663281)

All apps by Michael Galloy: https://appshunter.io/developer/803666042

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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 2026-06-10.*