Health & Fitness Calculators
One-Rep Max Calculator
Enter the weight you lifted and how many reps you completed to estimate your one-rep max, plus a table of training weights at common percentages.
171 lbs
Estimated one-rep max (Epley formula)
| % of 1RM | Weight | Typical reps |
|---|---|---|
| 100% | 171 lbs | ~1 |
| 95% | 162 lbs | ~2 |
| 90% | 154 lbs | ~4 |
| 85% | 145 lbs | ~6 |
| 80% | 137 lbs | ~8 |
| 75% | 128 lbs | ~10 |
| 70% | 120 lbs | ~12 |
How to use this tool
- 1Enter the weight you lifted.
- 2Enter how many reps you completed.
- 3See your estimated 1RM and a percentage-based training table.
Frequently asked questions
How accurate is an estimated 1RM?+
The Epley formula used here is a widely-used estimate, most accurate for rep ranges under about 10 — true 1RM testing involves some individual variation.