strength · Interactive tool
1RM Calculator
Estimate 1-rep max from submaximal sets via 4 validated formulas.
Interactive Tool
1RM Calculator
Estimate your 1-rep max from a submaximal set across four validated formulas.
Average estimate
114.8 kg
Epley
116.7 kg
Brzycki
112.5 kg
Lombardi
117.5 kg
O'Conner
112.5 kg
Training percentages
95% = 109 kg
90% = 103.5 kg
85% = 97.5 kg
80% = 92 kg
75% = 86 kg
70% = 80.5 kg
65% = 74.5 kg
60% = 69 kg
Stay within 3–10 reps for reliable estimates.
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