One Rep Max: 1RM Calculator

Contains adsIn-app purchases
3.7
102 reviews
10K+
Downloads
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.
Updated on
May 5, 2025

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

4.0
96 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.
14 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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A Google user
February 25, 2020
Decent.. wish free u could log accessory workouts and make like a chart but its ok for free
1 person found this review helpful
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What’s new

New! Visual Plate Calculator

• See exactly which plates to load on your barbell
• Visual representation of plates on both sides
• Works with pounds and kilograms
• Pro users can customize their plate inventory
• Smart calculations to match your available weights

No more mental math during your workouts - load your bar with confidence!