One-Rep Max (1RM) Estimator
Calculate the maximum weight you can lift for a single rep based on your current lifting performance.
One-Rep Max (1RM) Estimator
Calculate the maximum weight you can lift for a single rep based on your current lifting performance.
True 1RM testing carries an injury risk. Estimations provide a safe baseline for programming your lifts.
How This is Calculated
Estimated 1RM is calculated using the Epley formula: 1RM = weight × (1 + reps / 30). Percentage-based training zones: 95% ≈ 2 reps, 90% ≈ 4 reps, 85% ≈ 6 reps, 80% ≈ 8 reps, 75% ≈ 10 reps. Most accurate when reps ≤ 10. Alternative formulas include Brzycki (1993) and Lander (1985).
Disclaimer: This tool provides estimates for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
