One Rep Max: 1RM Calculator

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121 reviews
Content rating
Everyone
10K+
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Content rating
Everyone
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About this app

Stronger Training, Smarter Progress

One Rep Max helps you safely and accurately determine your maximum lift potential for bench press, deadlift, squat, and any other strength exercise - without risking injury.

Key Features:
• Precise Calculations - 7 scientific formulas for accurate strength predictions: Epley, Brzycki, Lombardi, Mayhew, McGlothin, O'Conner, Wathan
• RPE Integration - Factor in Rate of Perceived Exertion to fine-tune your max estimates based on how difficult sets feel
• Custom Exercise Tracking - Create and monitor any lift that matters to you
• Visual Progress - Beautiful graphs show your strength journey over time
• Percentage Charts - Quick reference guide for training percentages
• Goal Setting - Set targets and track your path to reaching them

Perfect for:
• Powerlifters optimizing their training cycles
• CrossFit athletes tracking multiple movement patterns
• Olympic weightlifters monitoring progress
• Strength enthusiasts at any level

Advanced Features:
• Choose between multiple calculation formulas for different lift types
• Track unlimited exercises with custom notes
• Rate of Perceived Exertion (RPE) - Fine-tune your 1RM estimates based on how difficult sets feel
• Analyze detailed statistics including volume and frequency
• Set and monitor progress toward specific strength goals

The Science Behind The Numbers:
Our app employs multiple validated formulas to estimate your one-rep maximum based on your performance with submaximal weights. This provides you with safe strength targets before attempting potentially risky maximal lifts.

Safety Note:
Heavy weightlifting should always be performed with proper technique and appropriate spotting. This app provides estimates based on scientific formulas, but individual performance may vary based on experience level and training history.
Powerlifting & strength calculator: Track max lifts, PRs & progress for the gym.
Updated on
Aug 18, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • This app may collect these data types
    Personal info, Health and fitness and 3 others
  • Data is encrypted in transit
  • You can request that data be deleted

Ratings and reviews

115 reviews
A Google user
February 19, 2019
ive used this app for a while. while trying ro clean up space on my phone i noticed this app was taking over 225mb of space, after I cleared the cache and data. i uninstalled and reinstalled, it states on the play store app page its 36mb. After installed it jumped to 75mb without even opening the app. Its a good tool but so many out there that are less resource hungry. bummer because I liked this app.
15 people found this review helpful
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Vandersoft
March 24, 2025
Hey there - the space required to install this app has been drastically reduced in v4 of the app! Please do try the latest version from Google Play! Let me know if I can do anything else to make the app better for you!
A Google user
May 27, 2019
A must have for anyone serious about weightlifting! It's easy on the battery and simple to use.
7 people found this review helpful
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Sandy Arbuckle
April 23, 2024
Great, especially for me I work out by myself and if I don't have any spotter I just do a nice weight and round it off to my max.♥️👍🏾
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What’s new

Fixed: the app no longer breaks when your phone's font size is turned up. If you use larger text, numbers and labels could overlap or run off the edge of the screen, and buttons could end up out of reach. Everything now stays put and readable, whatever your display settings. Plus the usual polish, performance improvements, and bug fixes.