One Rep Max Calculator
Estimates your one-rep max (1RM) from weight and reps (Epley formula).
Inputs
- Weight lifted (lb)
- Reps (reps)
Example
One-rep max (1RM): 216 lb
| 90% (3–4 reps) | 194 lb |
|---|---|
| 80% (8 reps) | 173 lb |
| 70% (12 reps) | 151 lb |
How it works
Epley formula: 1RM = weight × (1 + reps/30). An estimate.
FAQ
How does the One Rep Max Calculator work?
Estimates your one-rep max (1RM) from weight and reps (Epley formula). Epley formula: 1RM = weight × (1 + reps/30). An estimate.
Is the One Rep Max Calculator free?
Yes — every calculator on Calcova is free and you can download the results to Excel.