One-rep max (1RM) calculator
Enter the weight lifted and the reps performed to get the estimated 1RM.
Result
Lifting 80 kg for 5 reps estimates a 1RM of about 90 kg (Epley formula).
Example
Estimate your one-rep max from a weight and reps set in your browser. Values stay on your device; informational only.
Lifting 80 kg for 5 reps estimates a 1RM of about 90 kg (Epley formula).
Processed locally in your browser.
Methodology
Epley: 1RM = weight × (1 + reps/30). Other formulas (Brzycki, Lander) give slightly different estimates; informational only.
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