VitalMath
100% on-device
1-rep max estimator
Estimate your one-repetition maximum from the weight and reps you performed. Compare three established formulas and get useful training percentages.
Runs entirely in this tab. Nothing you enter is sent anywhere.
Weight unit
Estimates are most useful from a challenging set of 2–10 technically sound reps. Accuracy falls as reps rise; never test a maximum without safe setup.
Your estimate
92.4kg
Average of Epley, Brzycki and Lombardi estimates
Epley
93.3 kg
Brzycki
90 kg
Lombardi
94 kg
Formula spread
4 kg
Training percentages
100%92.4 kg
95%87.8 kg
90%83.2 kg
85%78.6 kg
80%73.9 kg
75%69.3 kg
70%64.7 kg
65%60.1 kg
60%55.5 kg
50%46.2 kg
Educational estimates only—not medical advice, diagnosis or a substitute for a qualified clinician. Stop exercise and seek care for concerning symptoms.