Fitness On Demand — One Rep Max Calculator
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FITNESS ON DEMAND

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Strength Intelligence Tool

One Rep Max Calculator

Enter a weight you completed for 1–15 good-form repetitions. The calculator compares seven established 1RM equations plus the supplied Fitness On Demand rep-percentage chart, then reports a robust median estimate and model range.

Enter your completed set

Best accuracy usually comes from a hard set in the lower rep range. Estimates become less certain as reps rise, especially above 10.

Your estimated maximum

Enter a completed set to calculate your estimated one-repetition maximum.

Fitness On Demand strength estimates are planning tools, not guarantees. Results vary by exercise, technique, fatigue, training status, and how close the entered set was to true repetition failure.