# One Rep Max: 1RM Calculator — Strength Tracker & Gym PR Tool

> Calculates one-rep max for strength exercises using scientific formulas and RPE. (iPhone/iPad app by Charles Vanderhoff.)

- Source: https://appshunter.io/ios/app/one-rep-max-1rm-calculator/id950621710 (this page in markdown: same URL + `.md`)
- Developer: [Charles Vanderhoff](https://appshunter.io/developer/950621709)
- Category: Health & Fitness, Sports
- Price: Free with in-app purchases
- Rating: 4.40/5 from 178 App Store ratings · 55 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 48 MB
- Languages: American English, Dutch, French (France), German (Germany), Italian, Japanese, Brazilian Portuguese, Russian, Turkish
- Released: 2014-12-30
- Data updated: 2026-08-18
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/one-rep-max-1rm-calculator/id950621710/reviews.md

## What is One Rep Max?

Stronger Training, Smarter Progress

One Rep Max helps you safely and accurately determine your maximum lift potential for bench press, deadlift, squat, and any other strength exercise - without risking injury.

Key Features:
• Precise Calculations - 7 scientific formulas for accurate strength predictions: Epley, Brzycki, Lombardi, Mayhew, McGlothin, O'Conner, Wathan
• RPE Integration - Factor in Rate of Perceived Exertion to fine-tune your max estimates based on how difficult sets feel
• Custom Exercise Tracking - Create and monitor any lift that matters to you
• Visual Progress - Beautiful graphs show your strength journey over time
• Percentage Charts - Quick reference guide for training percentages
• Goal Setting - Set targets and track your path to reaching them

Perfect for:
• Powerlifters optimizing their training cycles
• CrossFit athletes tracking multiple movement patterns
• Olympic weightlifters monitoring progress
• Strength enthusiasts at any level

Advanced Features:
• Choose between multiple calculation formulas for different lift types
• Track unlimited exercises with custom notes
• Rate of Perceived Exertion (RPE) - Fine-tune your 1RM estimates based on how difficult sets feel
• Analyze detailed statistics including volume and frequency
• Set and monitor progress toward specific strength goals

The Science Behind The Numbers:
Our app employs multiple validated formulas to estimate your one-rep maximum based on your performance with submaximal weights. This provides you with safe strength targets before attempting potentially risky maximal lifts.

Safety Note:
Heavy weightlifting should always be performed with proper technique and appropriate spotting. This app provides estimates based on scientific formulas, but individual performance may vary based on experience level and training history.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Key features

- 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

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| 1RM Pro Monthly | $2.99 | per month |
| 1RM Pro Annual | $19.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 1RM Pro Lifetime | $49.99 | one-time |


## Recent user reviews (10 of 55)

All indexed reviews: https://appshunter.io/ios/app/one-rep-max-1rm-calculator/id950621710/reviews.md

### 1/5 — Wow

*2026-07-28*

I’ve had this app for free since it first started and now I’m going to get charged a subscription for this. I think I’m going to do my own math now.

**Developer response:** You’ve been with this app over 10 years! That means so much to me. Send me an email at support@vandersoft.co for pro on the house.

### 1/5 — Disappointed

*2026-05-24*

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

**Developer response:** Appreciate your feedback! If you ever decide to come back send an email to support@vandersoft.co and I'll see about getting you a free trial of Pro.

### 3/5 — It does the job.

*2026-05-14*

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

### 5/5 — Best 1RM app I’ve used

*2026-04-18*

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.

**Developer response:** Thanks! Glad it has stuck.

### 1/5 — Made it useless unless you pay a sub

*2026-04-14*

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

**Developer response:** Thanks for giving the app a shot and appreciate the feedback!

### 1/5 — Free???

*2026-04-02, version 4.0.12*

Is the app not free to use anymore? 😅

### 1/5 — Functional, but delusional pricing

*2026-02-01*

I’m not paying you $50 for this app. It’s even more insulting you try to turn this into a subscription service. Get a real job.

**Developer response:** Thanks for giving the app a shot and appreciate the feedback!

### 1/5 — Rescinded key features

*2025-12-16*

I purchased this app a few years ago and I’m now blocked from using basic features without being forced to sit through 2 minutes of trash ads because the developer switched to a subscription model. It’s the way most of these apps are going, but it’s still gross. Now looking for an alternative.

**Developer response:** Hi there, I'm really sorry for the frustration. Previous lifetime purchasers absolutely should not be seeing ads or being asked to subscribe again — your original purchase should still be honored.

This sounds like a sync issue that I can fix for you. Please email me at support@vandersoft.co and I'll get your Pro access restored right away.

I appreciate you reaching out and hope to make this right!

### 5/5 — Helpful app & developer!

*2025-11-19*

This app has been extremely helpful for keeping track of my RMs. The developer was also quick to respond to my feedback and implemented some features based on it! I’m happy I can load the plate calculator from my last RM and quickly see which plates I need for a given percentage. Thanks! :)

**Developer response:** I’m really glad the app has been helping you track your RMs and simplify plate loading. I appreciate you sharing feedback, your suggestions directly helped shape those new features. If you ever have more ideas or run into anything, feel free to reach out anytime! 💪

### 1/5 — Was Great…

*2025-07-07, version 4.0.8*

Another example of taking a functional tool and turning it into a Swiss Army knife.

## Frequently asked questions about One Rep Max

### 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.

## Version history (last 5 releases)

### 4.0.22 — 2026-07-30

A smoother way to log. We've cleaned up the flow throughout the app, so adding a lift, updating a max, and checking your history all take fewer taps and less hunting around. Clearer screens, the numbers that matter easier to read at a glance, and less scrolling to get where you're going. Plus the usual polish, performance improvements, and bug fixes.

### 4.0.21 — 2026-06-28

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.

### 4.0.18 — 2026-06-24

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.

### 4.0.17 — 2026-06-19

Try Pro free. Start a free trial and unlock unlimited workout logs, advanced analytics, the plate calculator, and unlimited rep-max calculations. Keep chasing those max lifts!

### 4.0.16 — 2026-04-28

Faster PRs and cleaner lifts. The 1RM calculator now runs smoother on iOS 26, with improved charts for tracking bench press, squat, and deadlift progress. Brzycki and RPE-based max lift estimates are more accurate, and the gym log loads faster whether you're powerlifting, doing CrossFit, or barbell training. Keep chasing those max lifts!

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## More apps by Charles Vanderhoff

- [Wendler Log 531](https://appshunter.io/ios/app/wendler-log-531/id962162633)
- [Barbell Calculator Gym Calc](https://appshunter.io/ios/app/barbell-calculator-gym-calc/id979112637)
- [5x5 Workout - Madcow & Reg Park](https://appshunter.io/ios/app/5x5-workout-madcow-and-reg-park/id1011004314)
- [30 Day Ab Challenge - Amazing 6 Pack Abs Workouts](https://appshunter.io/ios/app/30-day-ab-challenge-amazing-6-pack-abs-workouts/id1024207720)
- [30 Day Push Up Challenge - Arm & Bicep Workouts](https://appshunter.io/ios/app/30-day-push-up-challenge-arm-and-bicep-workouts/id1030027145)

All apps by Charles Vanderhoff: https://appshunter.io/developer/950621709

## Related topics

[1rm](https://appshunter.io/ios/topics/1rm) · [1rm calculator](https://appshunter.io/ios/topics/1rm-calculator) · [1rm weight lifting rep max](https://appshunter.io/ios/topics/1rm-weight-lifting-rep-max) · [bench rep](https://appshunter.io/ios/topics/bench-rep) · [rpe calculator](https://appshunter.io/ios/topics/rpe-calculator) · [weight lifting calculator](https://appshunter.io/ios/topics/weight-lifting-calculator) · [rep calculator](https://appshunter.io/ios/topics/rep-calculator) · [1rm max calculator](https://appshunter.io/ios/topics/1rm-max-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 2026-08-18.*