1RM One-Rep Max Calculator
Calculate your one-rep max from the weight you lifted and the reps.
kg
reps
Result
93,3333 kg
1RM (Epley): 93,3333 kg
Result in all units
Step-by-step solution
1RM = w·(1 + r/30)
What Is the One-Rep Max (1RM)?
The 1RM is the heaviest weight you can lift in a single repetition of an exercise. It is the basis for setting training loads.
How is it calculated?
How Is It Calculated?
Epley formula: 1RM = weight × (1 + reps ÷ 30)
- Enter the weight you lifted and the number of reps.
For example, 80 kg × 10 reps: 80 × (1 + 10/30) ≈ 107 kg.
Frequently Asked Questions
Should I actually attempt a 1RM?
An estimation formula is safer; a real 1RM attempt carries injury risk and requires proper technique and supervision.