One Rep Max Calculator
Estimate your maximum strength potential safely and accurately.
Calculate 1RM
Estimate your one-repetition maximum based on your lifts.
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What is 1RM?
Your One Rep Max (1RM) is the maximum amount of weight you can lift for a single repetition of a given exercise with proper form. It is the gold standard for measuring pure strength.
Testing a true 1RM can be dangerous and taxing on the nervous system. Calculators allow you to estimate this number using sub-maximal loads (e.g., a weight you can lift 3-5 times).
Safety First
Always prioritize form over weight. If you are new to lifting or recovering from an injury, consult with a physical therapist or sports medicine doctor before attempting heavy lifts.