One Rep Max Calculator
Estimate your maximum lifting strength using Epley and Brzycki formulas, with training percentages.
Lift Performance
Enter your last lift's weight and clean reps.
Weight Lifted *
kg
reps
Best accuracy: 3–10 reps to failure.
Enter the weight you lifted and number of reps to estimate your 1RM.
Estimate the maximum weight you can lift for one repetition safely. Useful for strength training, progressive overload, and workout planning.
How this is calculated
Epley: 1RM = Weight × (1 + Reps / 30)
Brzycki: 1RM = Weight × 36 / (37 − Reps)
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These calculators provide general health and fitness estimates based on the information entered and standard scientific formulas. They are intended for educational and informational purposes only and should not be considered a substitute for professional medical advice, diagnosis, or treatment.
Results may vary based on individual health conditions, body composition, lifestyle, medications, and clinical factors. Always consult a qualified healthcare professional or doctor before making significant changes to your diet, exercise routine, medication, or health management plan.