One-Rep Max Calculator
Estimate your
true 1RM
Enter any weight and rep count — no need to actually max out to know roughly where you stand.
Estimated One-Rep Max
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📊 Training Percentages
| % of 1RM | Weight | Typical Use |
|---|
Notes
📊This uses the Epley and Brzycki formulas averaged together — both are widely used estimates, and they tend to agree closely for rep ranges under 10.
⚠Accuracy drops above 10 reps. These formulas are calibrated for lower rep ranges (1–10); a set of 20 reps won't estimate your max reliably.
🏃This is an estimate for programming purposes, not a substitute for testing your actual max under proper supervision if you need a certified number.