What Is One-Rep Max (1RM)?

Your One-Rep Max (1RM) is the maximum weight you can lift for a single repetition of an exercise. It serves as a fundamental strength metric, helping you track progress and structure your workouts effectively.

How to Calculate One-Rep Max

One of the most commonly used formulas for estimating 1RM is the Epley Formula :

1RM = Weight x (1 + (Reps ÷ 30))

For example, if you lifted 100 lbs for 5 reps , your estimated 1RM would be:

1RM = 100 x (1 + (5 ÷ 30)) = 116.7 lbs

Applying 1RM to Your Training

Understanding your 1RM helps tailor your workouts for different strength goals:

• Strength Training (85-100% 1RM): Heavy lifting for power and muscle growth.
• Hypertrophy (70-85% 1RM): Moderate weights to build muscle mass.
• Endurance (50-70% 1RM): Higher reps with lighter weights to improve stamina.

Why Knowing Your 1RM Matters

Tracking your One-Rep Max allows you to measure progress, set realistic goals, and train safely by avoiding excessive loads. Whether you're a beginner or an experienced lifter, understanding 1RM ensures structured and effective workouts.