One Rep Max Calculator

Discover Your Strength with our One Rep Max Calculator! Want to gauge your maximum lifting potential? Our calculator makes it easy to estimate your one-repetition maximum (1RM) for weightlifting exercises. Input your lift weight and repetitions, and let us do the math.

The one-repetition maximum (1RM) is a key indicator of strength and is widely used in weightlifting and strength training.

Defining 1RM

The one-repetition maximum represents the maximum amount of weight you can lift for a single repetition of a given exercise. It's a common benchmark to measure and track strength gains over time.

Estimating 1RM

Since attempting your actual 1RM can be risky, especially for beginners, estimations are often used. These estimates are based on submaximal lifts (lifting less than your true maximum) and use formulas to predict your 1RM based on the weight lifted and the number of repetitions performed.

Safety Precautions

Attempting a true 1RM lift can be physically demanding and risky, especially without proper supervision. It's important to warm up, use proper technique, and have a spotter if attempting maximal lifts.