The Ultimate Guide to Your 1

Welcome to the definitive guide on the single most important metric in strength training: the One-Rep Max (1RM). Whether you’re a seasoned powerlifter or just starting your journey, understanding and improving your 1RM is the key to unlocking your true potential. This article will not only teach you how to use our calculator but will also provide a comprehensive 12-week bench press program, expert nutrition advice, and a deep dive into the science of strength. Prepare to get stronger than ever before.

Your one-rep max is the maximum weight you can lift for a single repetition of an exercise with correct form. It’s the ultimate measure of your maximal strength. Knowing your 1RM is crucial because it allows you to program your training effectively, ensuring you’re using the right intensity to stimulate strength and muscle gains. Without it, your training is just guesswork.[1],[2]

Testing a true 1RM can be risky and taxing on your central nervous system. That’s why formulas were developed to estimate it based on submaximal efforts (lifting a lighter weight for multiple reps). Our calculator exclusively uses the Landers Formula, which is considered one of the most accurate and scientifically validated methods available.

Developed in 1985 and published in the NSCA Journal, this formula has been extensively tested and is the gold standard for 1RM estimation:[6]

While we stand by the accuracy of the Landers Formula, it’s useful to know about other popular models you might encounter, such as the Brzycki[3] and Epley[4] formulas. Although they may produce slightly different results, all aim to provide a safe and reliable way to gauge your strength without the risks of a max-out attempt.

Once you know your 1RM, you can structure your workouts using percentages. This method, known as percentage-based training, is the cornerstone of effective strength programs.

If you decide to test your true 1RM, safety is paramount. Follow these steps: