Free tools · Strength & Gym
One Rep Max Calculator
Free · No signupEstimate 1RM from a working set using Epley and Brzycki, then see training percentages for every rep range.
Your stats
Estimated 1RM
252.7lb
Average of Epley and Brzycki
| % 1RM | Load | Typical reps |
|---|---|---|
| 100% | 252.7 lb | 1 |
| 95% | 240.1 lb | 2 |
| 90% | 227.4 lb | 3–4 |
| 85% | 214.8 lb | 5–6 |
| 80% | 202.2 lb | 6–8 |
| 75% | 189.5 lb | 8–10 |
| 70% | 176.9 lb | 10–12 |
| 65% | 164.3 lb | 12–15 |
| 60% | 151.6 lb | 15+ |
| 55% | 139 lb | 15+ |
| 50% | 126.4 lb | 15+ |
Questions
Which 1RM formula is best?
Epley and Brzycki agree best in the 3–8 rep range. We average them. Above ~12 reps, formulas get sloppy — use a heavier set.
Is this medical advice?
No. These calculators are for wellness and fitness planning only. Talk to a physician before changing how you eat or train.
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Hammr Fitness is for wellness and fitness purposes only. It is not medical advice. Consult a physician before starting any exercise or nutrition program. If you have a medical emergency, call emergency services.