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Are you a Powerlifter,  into Crossfit, or just a gym rat?  You need this app!.  Take it to the gym with you to make sure you are calculating your lift numbers correctly.  This app is completely free and does not have any ads.  We built this app for ourselves.  We wanted the ultimate tool for getting the best powerlifting results possible and wanted to share it with everyone who is looking for the same thing.  Press the info button to communicate directly with us with ideas to improve the tool.  What are you waiting for, it is free.

One rep maximum (1RM) in weight training is the max amount of weight one can lift in a single repetition for a given exercise. One repetition maximum can be used for determining an individual's maximum strength and is the method for determining the winner in events such as powerlifting and weightlifting competitions.

One repetition maximum can also be used as an upper limit, in order to determine the desired "load" for an exercise (as a percentage of the 1RM).

With the 1 Rep Max app, you can enter the amount of weight you lifted on a movement and the number of reps to calculate your 1 rep max and various percentages of your one rep max.

For example you lifted 200lbs 3 times. Using this information you can calculate that your max is approximately 212lbs.

This app also can be used to quickly determine a percentage of your one rep max. Many weight programs will tell you to lift 65% of your 1RM for 5 sets of 8 reps. Using the example max from above you can determine that your max is 212 and then click over to 65% and see that you need to lift 138 in this workout.

Use this in conjunction with the Mainsite Track app also available in the app store to create custom workouts.

If you enjoy using 1RepMax, please take a minute to leave a nice review: it really helps!

What’s New

Version 2.5.5

Bug Fixes and improvements

Ratings and Reviews

4.1 out of 5
11 Ratings
11 Ratings
Capt Gii ,

Easy to use and reasonably accurate

Great for calculating what to max on heavy days, just back off about 5 pounds

Rob Coberg ,

Awesome App

Easy to use, accurate information.

Kevdogggggggggggg ,


Does what it says it does! You can use this app to help plan your lifts.


Greg Mccormick
5.1 MB
Health & Fitness

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 2016 Greg McCormick


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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