1RM Calculator: Predict Your One-Rep Max for Any Lift

Use the calculator below to predict your one-repetition maximum (1RM) for any lifts you do in your strength training program. When you press the calculate button, the calculator will also predict your strength levels as a percentage of your 1RM.

The weight must be between 0.5 – 500 and the number of reps must be between 1 – 50.

What is Your One-Rep Max (1RM)?

Why Do You Want to Know Your One-Rep Max?

How Accurate are 1RM Calculators?

What Are The One-Rep Max Percentages?


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