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🏋️ One Rep Max Calculator
Estimate your one-rep max (1RM) using the Epley formula from your weight and reps performed.
What Is the Epley Formula?
The Epley formula estimates your one-rep max as: 1RM = Weight x (1 + Reps / 30). It is one of the most widely used formulas in strength training and works best for rep ranges between 2 and 10.
How to Use Your 1RM
Knowing your 1RM helps program training intensity. Strength work typically uses 85-95% of 1RM, hypertrophy 65-85%, and endurance 50-65%. Never attempt a true 1RM without a spotter and proper warm-up.
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