Health
One Rep Max Calculator
Estimate your 1RM and training percentages for weightlifting.
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One Rep Max Calculator
kg
Results
Formula & Methodology
Epley: 1RM = w × (1 + r/30)
Brzycki: 1RM = w × 36/(37-r)
Lombardi: 1RM = w × r^0.10
O'Conner: 1RM = w × (1 + r/40)
Where w = weight lifted, r = reps performed
Brzycki: 1RM = w × 36/(37-r)
Lombardi: 1RM = w × r^0.10
O'Conner: 1RM = w × (1 + r/40)
Where w = weight lifted, r = reps performed
About One Rep Max Calculator
Your one-rep max (1RM) is the maximum weight you can lift for a single repetition of a given exercise. Our calculator estimates it using four validated formulas, then provides a training percentages table.
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