# One Rep Max Calculator - (1RM) > Gym calculator for estimating one-rep maximum strength using the Brzycki Formula. (iPhone/iPad app by Brian Mcabee.) - Source: https://appshunter.io/ios/app/one-rep-max-calculator-1rm/id1596587580 (this page in markdown: same URL + `.md`) - Developer: [Brian Mcabee](https://appshunter.io/developer/1596587582) - Category: Health & Fitness, Utilities - Price: Free - Rating: 5.00/5 from 14 App Store ratings · 6 written reviews indexed - Age rating: 4+ - Requires: iOS 14.0 · 0 MB - Languages: American English - Released: 2021-11-23 - Data updated: 2026-06-10 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/one-rep-max-calculator-1rm/id1596587580/reviews.md ## What is One Rep Max Calculator? This simple calculator is used to calculate your 1 rep max for maximum output in the gym! Simply enter a weight you've lifted for a certain amount of reps and see your results dynamically displayed on the screen. Utilizing the Brzycki Formula, this 1RM calculator will allow you to get an accurate estimate of how much weight you can lift relative to a heavy exercise set of 10 reps or less. Please note that for the most accurate 1RM estimates, sets of lower repetitions are more accurate than sets of repetitions closer to 10. ## Key features - 1RM calculation - Brzycki Formula - Dynamic results display - Weight and rep input - Strength estimation ## Recent user reviews (6 of 6) All indexed reviews: https://appshunter.io/ios/app/one-rep-max-calculator-1rm/id1596587580/reviews.md ### 5/5 — Everything you need and nothing you don’t! *2021-11-25, version 1.0* Super easy to use, huge help while planning my workouts. ### 5/5 — Best app for PR’s *2021-11-25, version 1.0* Cant go wrong with this for quick numbers. Cuts down time between sets ### 5/5 — Awesome App! *2021-11-25, version 1.0* I’ve been looking for a calculator like this! Very nice ### 5/5 — Clean, Easy to use *2021-11-25, version 1.0* Clean interface, easy to use. Pretty easy to use. ### 5/5 — Great app *2021-11-24, version 1.0* Great useful app for bench pressing !! ### 5/5 — Cool App *2021-11-23, version 1.0* App is pretty cool 👍 ## Frequently asked questions about One Rep Max Calculator ### What is the One Rep Max Calculator used for? The One Rep Max Calculator is used to estimate your maximum weight lifted for a single repetition (1RM) in gym exercises. It helps users understand their strength potential and track progress. ### What formula does the One Rep Max Calculator use? This calculator utilizes the Brzycki Formula to provide an accurate estimate of your one-rep maximum. This formula is commonly used in strength training to gauge maximum output. ### How accurate are the 1RM estimates? For the most accurate 1RM estimates, the calculator recommends using sets with lower repetitions (10 or less). Sets closer to 10 reps may yield less precise results. ### What devices is the One Rep Max Calculator available on? The One Rep Max Calculator is available for iPhone and iPod devices. It is designed for Apple's mobile operating system. ### What is the age rating for the One Rep Max Calculator? The app has an age rating of 4+, making it suitable for a wide range of users. This indicates it contains no mature content. ### How often is the One Rep Max Calculator updated? The latest version of the One Rep Max Calculator is 1.0.1, which was last updated on December 12, 2021. Future updates may be released by the developer. ### Does the One Rep Max Calculator have ads? No, the One Rep Max Calculator does not contain advertisements. Users can calculate their 1RM without interruption. ### What is the user sentiment for the One Rep Max Calculator? Based on 14 ratings, the app has received an average rating of 5.0 stars, indicating overwhelmingly positive user sentiment and satisfaction. ## Version history (last 2 releases) ### 1.0.1 — 2021-12-12 - iPhone X, XR support - Minor Bug Fixes ### 1.0 — 2021-11-23 No release notes. ## Apps similar to One Rep Max Calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [Powerlift – Barbell Calculator](https://appshunter.io/ios/app/powerlift-barbell-calculator/id1502056323) | 4.5 (72) | Free | Health & Fitness | | [1RM Percentage Calculator](https://appshunter.io/ios/app/1rm-percentage-calculator/id6451496905) | 5.0 (3) | Free | Health & Fitness | | [RepMax: 1RM Calculator](https://appshunter.io/ios/app/repmax-1rm-calculator/id6449795865) | — | Free | Health & Fitness | | [TrueSquat](https://appshunter.io/ios/app/truesquat/id1019177928) | 3.3 (3) | $1.99 | Health & Fitness | | [WODTT](https://appshunter.io/ios/app/wodtt/id1527266402) | 5.0 (4) | Free | Health & Fitness | | [Barbell Notebook](https://appshunter.io/ios/app/barbell-notebook/id1546749373) | — | Free | Health & Fitness | --- *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.*