One Rep Max Calculator
Calculate and track your health and fitness metrics natively and securely inside your browser.
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Calculations are most accurate within 1-10 reps. The Epley formula loses reliability past 10-12 repetitions.
Enter your weight lifted and repetitions to see your projected One Rep Maximum capacity using the Epley formula.
Medical Disclaimer: Lifting maximal weights carries a high risk of musculoskeletal injury. The 1RM estimates provided by this calculator are mathematically projected bounds based on the Epley formula and should not replace professional fitness supervision or medical advice. Always use a spotter, employ proper technique, and consult with a licensed physician or certified strength and conditioning specialist (CSCS) before attempting high-intensity strength training, especially if you have pre-existing cardiovascular or orthopedic conditions.
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