Health & Fitness · Free tool
One-Rep Max Calculator
Estimate your 1RM from a set of N reps — Epley, Brzycki, Lombardi, Mayhew formulas side by side.
Updated April 2026
Estimated 1RM (average)
262 lb
Averaged across Epley, Brzycki, Lombardi, and Mayhew.
By formula
| Formula | 1RM (lb) |
|---|---|
| Epley | 263 |
| Brzycki | 253 |
| Lombardi | 264 |
| Mayhew | 268 |
Programming percentages
| % of 1RM | Working weight |
|---|---|
| 100% | 262 lb |
| 95% | 249 lb |
| 90% | 236 lb |
| 85% | 223 lb |
| 80% | 210 lb |
| 75% | 196 lb |
| 70% | 183 lb |
| 65% | 170 lb |
| 60% | 157 lb |
| 55% | 144 lb |
| 50% | 131 lb |
Accuracy drops above ~10 reps. Always warm up and use a spotter for max attempts.
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What it does
Get your 1RM across four formulas and load targets for every training % band.
Runs entirely in your browser — no upload, no account, no watermark. For more tools in this category see the full tools index.
How to use it
- Enter weight and reps.
- Read 1RM per formula.
- Use the % table for programming.
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