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One Rep Max: 1RM Calculator

One Rep Max: 1RM Calculator

Strength Tracker & Gym PR Tool

178 ratings
54 reviews
With Ads
💪 Health & Fitness
⚽ Sports
Free
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Details

  • Released
  • Updated
  • December 30, 2014
  • July 30, 2026

Features

Developer

Charles Vanderhoff
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iphone
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🧾$49.99
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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
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What's New in One Rep Max

4.0.22

July 30, 2026

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.

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Subscription plans

1RM Pro Monthly

Analyze lifts, plate calculator & ad free!

$2.991 Month
How to cancel One Rep Max subscription ⁉️
1

In-App Purchases

$49.99

1RM Pro Lifetime

Analyze lifts, plate calculator & ad free!

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.
Hellraiser333222Hellraiser333222

Response from developer

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.

Disappointed

Placing previously available features behind a paywall? Yeah, uninstalled.
Jewlius13Jewlius13

Response from developer

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.

It does the job.

It definitely does the job. Was 5 stars then it put the percentages/reps behind a pay wall.
Concerned DonkeyConcerned 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.
Charlie0001Charlie0001

Response from developer

Thanks! Glad it has stuck.

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
MotherPreacherMotherPreacher

Response from developer

Thanks for giving the app a shot and appreciate the feedback!

See 49 more reviews

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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.