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One rep max calculator

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Estimate the maximum weight you can lift for a single repetition (1RM) from a weight you can lift 1–10 times.

Units
kg
times (1–10)
Settings

Desired unit

1RM estimation formula

Result

Estimated max reps

RepetitionsWeight% of 1RM
% of 1RMWeightRepetitions

1RM is estimated with the selected formula (Epley, Brzycki, or Lombardi). Estimates are most accurate for 1–10 repetitions. These are estimates only and are not a substitute for proper coaching or medical advice. Use a spotter when training near your maximum.