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One Rep Max: 1RM Calculator

One Rep Max: 1RM Calculator

Strength Tracker & Gym PR Tool

185 ratings
55 reviews
With Ads
💪 Health & Fitness
⚽ Sports
Free
In-App PurchasesWith Ads

Details

Released
December 30, 2014
Updated
September 29, 2026

Features

Developer

Charles Vanderhoff
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About

Safely estimate your maximum lift potential for various strength exercises using scientific formulas. Track your progress visually, set goals, and fine-tune estimates with perceived exertion. Ideal for powerlifters, CrossFit athletes, and strength enthusiasts.

✓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
Show original description

What users say about One Rep Max

Reviews of One Rep Max are mostly negative: the Health & Fitness app is rated 4.4/5 from 185 App Store ratings. What users like most: easy to use interface, tracks progress with charts. Top complaints: subscription required for features, features moved behind paywall. Summarized from real user reviews.

Positive things

  • 👍Easy to use interface
  • 📊Tracks progress with charts
  • ➕Plate calculator bonus feature
  • 📈Supports multiple 1RM formulas
  • 💪Helpful for tracking RMs
  • ✅Calculates 1RM accurately
  • 🆓Free to use (historically)
  • ✨Simple and quick
  • 🚀Fast and easy
  • 💯Best 1RM app
  • 💡Addition of 2-10RM
  • ⚖️Weightlifting calculator
  • 📈Graphs for improvements
  • 💯Accurate calculations
  • ✅Works as intended
  • 💯Best 1RM app on iOS
  • 💯Straight forward
  • 👍Great for tracking maxes
  • 💯Very useful as is
  • 💯Best way to track 1RM
  • 💯User friendly and accurate
  • 💯Simple and handy

Negative things

  • 💰Subscription required for features
  • 💸Features moved behind paywall
  • 😩Useless without subscription
  • 🚫Basic features now paid
  • 💸High subscription cost
  • 😠Forced ads for basic features
  • 📉Graphing feature now Pro only
  • 🤔Unclear what was purchased
  • 💸Not worth the cost
  • 📉Deleted lifting history
  • 📉Lost all logs with update
  • 🚫Weight limit restriction
  • 📉Poor interface
  • 🐛Buggy with dates and lifts
  • 👎Horribly user-unfriendly
  • 🐛Reloads excessively
  • 🐛Wonky and now dead
  • 🐛Complicated and too much offered
  • 🐛Not intuitive for tracking
  • 🐛Buggy about dates and lifts
  • 🐛Weight limit restriction
  • 🐛Max weight limit too low
  • 🐛Not useful for intended audience
  • 🐛Cannot select other lifts
  • 🐛Only logs back squats
See all reviews

What's New in One Rep Max

4.0.24

September 29, 2026

Stronger foundations for your strongest lifts. Upgraded to the latest iOS frameworks with refreshed sign-in. Your lifts and maxes carry right over. Go chase that next PR.

More
5

Subscriptions & In-App Purchases

1RM Pro Monthly

Analyze lifts, plate calculator & ad free!

$2.991 Month
How to cancel One Rep Max subscription ⁉️

User reviews

Most RecentHighest RatedLowest Rated

Wow

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.
HHellraiser333222

Disappointed

Placing previously available features behind a paywall? Yeah, uninstalled.
JJewlius13

It does the job.

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

Best 1RM app I’ve used

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.
CCharlie0001

Made it useless unless you pay a sub

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

🐞

Reported Bugs

13 issues

Features behind paywall

Bug

Forced ads

Bug

Deleted lifting history

Bug

Lost all logs with update

Bug

Weight limit restriction

Bug

Reloads excessively

Bug

Wonky and now dead

Bug

Complicated and too much offered

Bug

Not intuitive for tracking

Bug

Buggy about dates and lifts

Bug

Cannot select other lifts

Bug

Only logs back squats

Bug

App copying content from clipboard

Bug
✨

Requested Features

7 requests

Allow editing of logs (date/time)

Feature

Manual entry for weight preferred over slider

Feature

Include different 1RM formulas (Epley, Brzycki)

Feature

Ability to create custom graphs

Feature

Fix weight limit restriction

Feature

Allow logging of more than 1073 pounds

Feature

Update app

Feature

FAQ

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.