1RM Calculator
Enter the weight you lifted and the number of reps to estimate your one rep max (1RM). We average the most trusted formulas — Epley, Brzycki, Lombardi and O'Conner — and give you a percentage table to plan your training loads.
Training percentages
| % of 1RM | Load (kg) |
|---|---|
| 95% | 109.0 |
| 90% | 103.3 |
| 85% | 97.6 |
| 80% | 91.8 |
| 75% | 86.1 |
| 70% | 80.3 |
| 65% | 74.6 |
| 60% | 68.9 |
| 55% | 63.1 |
| 50% | 57.4 |
Track your PRs automatically
MoveTrack Fitness logs every lift, calculates your 1RM and plate loading, and tracks personal records over time. Free on iOS & Android.
Frequently asked questions
What is a 1RM (one rep max)?
Your 1RM is the maximum weight you can lift for a single repetition of an exercise with proper form. It is the standard reference for prescribing training loads, usually as a percentage of 1RM.
How accurate are 1RM formulas?
Estimates are most accurate when based on sets of 1–10 reps. Above 10 reps the error grows. Formulas like Epley and Brzycki are typically within 2–5% for trained lifters.
Do I need to test my real 1RM?
No. For most training purposes an estimated 1RM is safer and good enough. Testing a true 1RM is demanding and is usually reserved for competition or specific strength blocks.