My 1 Rep Max 4+

1 Rep Max Calculator

James T. Constant

    • 4.5 • 105 Ratings
    • Free
    • Offers In-App Purchases

iPhone Screenshots


My 1 Rep Max is a 1 Rep Max calculator and log book. Use any of the most popular 1 Rep Max formulas to estimate your 1 Rep Max weight and keep a log to see your progress over time.

Simply select a lift type, enter a weight, and a number of repetitions (up to 10), and tap the Calculate button to see your 1 Rep Max.

With My 1 Rep Max Premium, you can create your own custom lifts and use more than 10 repetitions to perform calculations.

A Note About Safety:
One rep maximum calculators are used to estimate the maximum amount you can lift. The degree of accuracy can vary significantly depending on your experience with weight training as well as your muscular composition. Most one rep maximum calculators are designed for experienced strength trainers so, if you are inexperienced, you may find your actual one rep maximum is much lower because your body is not accustomed to the stress of lifting heavy weight. Because it can be dangerous to attempt to lift your estimated maximum, always have a spotter with you. Seriously.

My 1 Rep Max will never ask you for a rating or review. However, if you'd like to take the time to rate or review it, you can do so from the Settings screen.

What’s New

Version 2.1.0

Minor fix for log sorting.

Ratings and Reviews

4.5 out of 5
105 Ratings

105 Ratings

mchristmas35 ,

More lifts needed

The simplicity of the app is the reason for the use. The only thing that could be added would be additional lifts. I.e. snatch, power snatch, power clean, clean and jerk. More Olympic lifts!!

Developer Response ,

Thanks for the suggestions! More lifts and the ability to add your own will be in a future release.

Savaii76 ,


I’ve always relied on my former trainer to set the weights and or/ make it up as go along. This is a real time saver and helpful to know what numbers I’m going to smash next!!

liletvee ,

Very accurate


App Privacy

The developer, James T. Constant, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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