The Ultimate Rep Max Calculator

About This Rep Max Calculator

This free 1 Rep Max (1RM) and Rep Max Calculator helps athletes, lifters, and coaches quickly estimate their maximum lifting capacity for bench press, squat, deadlift and more based on the weight and number of reps performed. By entering your lifted weight and reps, the tool automatically calculates your estimated 1RM using formulas such as Brzycki, Epley, Lombardi, and O’Connor. The calculator also generates a detailed rep max table showing predicted performance from 1 to 10 reps, including suggested barbell loadouts for convenience.

How to Use

• Select your preferred unit: pounds (lbs) or kilograms (kg).

• Enter the weight you lifted and the number of repetitions performed (1–10 reps).

• Optionally, adjust the formula in the Advanced Settings for different prediction methods.

• Review your estimated 1RM, rep max percentages, and recommended barbell weight breakdowns.

Limitations

Please note that rep max formulas provide estimates and may vary depending on your individual training background, muscle fiber composition, and fatigue levels. Predictions are most accurate within moderate rep ranges (typically 3–10 reps). Always use proper form and safety precautions when testing your limits. This calculator is for educational and training guidance purposes only and should not replace professional coaching or medical advice.