Simple One-Rep-Max Calculator

Simple One-Rep-Max Calculator

Calculate your 1RM like a pro!

1 ratings
2 reviews
#200 in paid Health & Fitness
💪 Health & Fitness
$0.99

Details

  • Released
  • Updated
  • January 6, 2017
  • January 18, 2026

Features

Simple One-Rep-Max Calculator screenshot #1 for iPhone
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About

This app helps you accurately determine your one-rep max (1RM) using multiple proven formulas. It provides reliable estimates to help you choose the right weights for your training, ensuring safer and more effective strength progression.

Accurate one-rep max estimates
Multiple proven calculation formulas
Determine training weights
Fast and simple interface
Distraction-free design
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What's New in Simple One

2.1.0

January 18, 2026

More clarity. More confidence. Better numbers. You can now calculate your one-rep max using multiple proven formulas, giving you a clearer picture of your true strength instead of relying on a single estimate.

More

Charts

Top Paid

📉 200-20

Health & Fitness

This app dropped -20 positions in Health & Fitness chart.

Last updated on July 11, 2026.

Events

Read more about New 1RM formulas

New 1RM formulas

You can now choose your preferred formula

Jan 16, 2026 Feb 16, 2026

User reviews

Simple, accurate, easy to use, free

The work out tracker I use doesn’t have a max rep calculator built in so I wanted one as a stand alone app.

As I switch between volume and strength based workout routines, this helps calibrate the weight I should be using for the new rep ranges.

The app is super easy to use, it’s free, doesn’t ask for weird permissions or anything, and will show you the estimated max weight for a range of repetitions (12 - 1 rep) for any input weight and rep.

The other review giving one star is super odd. Rep max calculations aren’t accurate if you have a higher rep range, as this is testing muscle endurance and stamina above strength. Hence, the app shows the rep max for rep ranges of 1 to 12 only.

This app works as described and is free while others are trying to charge for this feature.

Recommended.
Show more

No

Won't let user input more than 12 reps. Must load weights to a potential unsafe load to calculate 1RM

Developer apps

FAQ

What is the price of Simple One-Rep-Max Calculator?

Simple One-Rep-Max Calculator is a paid app priced at $0.99. This one-time purchase grants you access to all its features.

Does Simple One-Rep-Max Calculator have ads?

No, Simple One-Rep-Max Calculator is ad-free. You can use the app without any interruptions from advertisements.

What devices does Simple One-Rep-Max Calculator support?

Simple One-Rep-Max Calculator is currently supported on iPhone devices.

How often is Simple One-Rep-Max Calculator updated?

The app was last updated on January 18, 2026, indicating ongoing support and potential for future improvements. It was initially released on January 6, 2017.

What is the age rating for Simple One-Rep-Max Calculator?

Simple One-Rep-Max Calculator has an age rating of 17+. This is likely due to its focus on adult fitness and strength training.

What formulas does Simple One-Rep-Max Calculator use?

The app utilizes multiple proven formulas to calculate your one-rep max, offering greater confidence in the estimates provided.

Can Simple One-Rep-Max Calculator help me choose workout weights?

Yes, by providing accurate 1RM estimates, the app helps you determine the right weights for your training intensity and safely progress your strength.

What is the user sentiment for Simple One-Rep-Max Calculator?

Based on the available rating, Simple One-Rep-Max Calculator has a 4.0-star rating from one review, suggesting a positive initial reception.