One-Rep Max (Lander) Calculator
Enter the weight and reps to estimate your one-rep max.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
The Lander formula estimates a lifter's one-rep max (1RM) — the heaviest weight they could lift for a single rep — from a set taken to or near failure at a higher rep count: 1RM = (100 × weight) / (101.3 − 2.67117 × reps). It's one of several competing 1RM formulas (alongside Epley and Brzycki), and tends to track slightly differently at higher rep ranges than those alternatives.
Strength coaches and lifters use estimated 1RM to program training loads as a percentage of max without needing to actually attempt a risky single-rep maximum lift, and to track strength progress over time from ordinary training sets.
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