About
We build precision tools for strength athletes. No ads, no fluff, just the numbers you need to get stronger.
What is onerepmax.org?
onerepmax.org is a specialized utility designed for serious lifters, coaches, and fitness enthusiasts. We focus on one thing: providing the most accurate, distraction-free strength analysis tools on the web. In an industry filled with bloated apps and paywalls, we stand out by offering a clean, fast, and accessible platform for calculating your One-Rep Max (1RM) across any lift.
Whether you are testing your strength for a powerlifting meet or calculating percentages for a hypertrophy block, our tool provides the instant, reliable data you need to program your training effectively.
What We Offer
Exercise-Specific Calculations
Specialized context and analysis for major compound lifts like Bench Press, Squat, Deadlift, and Weighted Calisthenics.
Rep-Range Analysis
Analyze your strength endurance with calculators specifically designed for distinct rep ranges, from heavy 2-rep maxes to high-volume 30-rep sets.
Detailed Breakdowns
Get instant percentage charts for programming your training blocks (hypertrophy, strength, power) based on your estimated max.
Privacy-First Design
No accounts required, no tracking, no data storage. Your numbers are yours.
The Science Behind the Math
We utilize the Brzycki Formula, developed by Matt Brzycki in the early 1990s. It is widely regarded as one of the most accurate methods for estimating a one-repetition maximum (1RM) based on sub-maximal performance.
Why use an estimate? Testing a true 1RM places immense stress on the central nervous system and carries a higher risk of injury. By calculating your max from a heavy set of 3-5 reps, you can get a number that is 95%+ accurate without the systemic fatigue or risk of failure associated with a true 1RM attempt.
Ready to find your limit?
Stop guessing. Start training with precision today.