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Lifting Max Estimator

Estimate your one-rep max (1RM) from any working weight and reps using multiple evidence-based formulas.

Enter the heaviest set you completed with solid form.

Suggested 1RM

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Enter a weight and reps to calculate.

Range

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Median of the lower/upper quartile estimates.

Formula Estimated 1RM (kg)
Add a weight and reps to see estimates.
Formulas included: Epley, Brzycki, Lander, Lombardi, Mayhew et al., O'Conner, Wathan Suggested 1RM uses the median of all formulas to reduce outliers.