One Rep Max Calculator
Estimates your one-rep max (1RM) from weight and reps (Epley formula).
Every calculation runs instantly in your browser, so your inputs are never sent to a server, and the tool is free with no sign-up. You can save the results as an Excel file with live formulas and reuse them later.
Inputs
- Weight lifted (lb)
- Reps (reps)
Example calculation
One-rep max (1RM): 216 lb
| 90% (3–4 reps) | 194 lb |
|---|---|
| 80% (8 reps) | 173 lb |
| 70% (12 reps) | 151 lb |
Method & notes
Epley formula: 1RM = weight × (1 + reps/30). An estimate.
Tips
Change any input and the result recalculates in real time. After downloading the Excel file, you can reuse it by editing only the yellow input cells.
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.
Can I save the results?
Yes. You can download the results for free as an Excel (.xlsx) file with live formulas that recalculate when you change the yellow input cells.
Is it free?
Yes — all Calcova calculators are free, and you can save results as an Excel file.