One Rep Max (1RM) Calculator
Your One Rep Max
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Understanding Your One Rep Max
Your one-rep max (1RM) is the maximum weight you can lift for a single repetition of an exercise with proper form. This calculator uses the Brzycki formula to estimate your 1RM based on the weight you can lift for multiple repetitions.
Training Zones
- Power (75-90%): Explosive movements, athletic performance
- Strength (≥85%): Maximum strength development
- Hypertrophy (67-85%): Muscle growth and size
- Endurance (≤67%): Muscular endurance and stamina