One Rep Max Calculator
Estimate your one rep max (1RM) using Epley, Brzycki, and Lombardi formulas. Enter the weight and reps you performed to see your estimated max and percentage-based training loads.
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How to Use the 1RM Calculator
- Enter the weight you lifted.
- Enter the number of reps you completed.
- View your estimated 1RM from three different formulas.
- Use the percentage table to plan your training loads.
Formulas Used
- Epley: weight x (1 + reps/30)
- Brzycki: weight x (36 / (37 - reps))
- Lombardi: weight x reps^0.10
Features
- Three proven 1RM estimation formulas
- Percentage-based training load table (50%-100%)
- Rep range descriptions for each percentage
- Supports lbs and kg units
- One-click copy results to clipboard
- 100% client-side -- no data sent to any server
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Disclaimer: This tool is provided as-is for informational and educational purposes only.