One-Rep Max Calculator
Estimate your one-rep max from a weight and the reps you can lift, with a full percentage table to plan your training.
Read the guide: How to Estimate Your One-Rep Max SafelyYour lift
Unit
Estimated 1-rep max
114.6 kg
Epley 116.7 · Brzycki 112.5
| % of 1RM | Weight | Approx. reps |
|---|---|---|
| 100% | 114.6 kg | 1 |
| 95% | 108.9 kg | 2 |
| 90% | 103.1 kg | 4 |
| 85% | 97.4 kg | 6 |
| 80% | 91.7 kg | 8 |
| 75% | 85.9 kg | 10 |
| 70% | 80.2 kg | 12 |
| 65% | 74.5 kg | 16 |
| 60% | 68.8 kg | 20 |
| 55% | 63 kg | 24 |
| 50% | 57.3 kg | 30 |
How it works
- 1
Enter your lift
Add the weight you lifted and how many reps you managed.
- 2
See your 1RM
View the estimate from two well-known formulas, averaged.
- 3
Use the table
Read off training loads at each percentage of your max.
Instant & 100% private — nothing is uploaded
Every calculation runs locally in your browser. The measurements, dates and details you enter stay on your own device and are never sent to a server — nothing is stored, logged or shared.
Frequently asked questions
- How accurate is an estimated 1RM?
- It is most accurate for low rep counts (under about 10). The more reps you used to estimate it, the rougher the number — use it as a guide, not gospel.
- Why use percentages of 1RM?
- Many programs prescribe loads as a percentage of your max — for example 5 reps at 80%. The table converts your estimated max into those working weights.