One Rep Max Calculator
Estimate your one rep max using multiple formulas. Enter the weight you lifted and how many reps you completed.
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Estimated 1RM (Average)
93.1 kg
205.3 lbs
Epley
93.3 kg
Brzycki
90.0 kg
Lombardi
94.0 kg
Mayhew
95.2 kg
| % of 1RM | Weight | Estimated Reps |
|---|---|---|
| 100% | 93.1 kg | 1 |
| 95% | 88.5 kg | 1 |
| 90% | 83.8 kg | 2 |
| 85% | 79.2 kg | 3-4 |
| 80% | 74.5 kg | 5-6 |
| 75% | 69.8 kg | 7-8 |
| 70% | 65.2 kg | 9-11 |
| 65% | 60.5 kg | 12-15 |
| 60% | 55.9 kg | 16-20 |
| 55% | 51.2 kg | 21-25 |
| 50% | 46.6 kg | 26+ |
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Frequently Asked Questions
What is one rep max?
One rep max (1RM) is the maximum amount of weight you can lift for a single repetition of a given exercise. It is used to measure strength and program training intensity.
Which formula is most accurate?
The Brzycki formula is widely used and accurate for 1-10 reps. The Epley formula works well for higher rep ranges. We show the average of four formulas for the best estimate.
Is it safe to test my actual one rep max?
Testing a true 1RM carries injury risk, especially without a spotter. This calculator lets you estimate it safely from sub-maximal reps without maximal strain.