1RM Calculator — Epley Formula

Calculate your one-rep max using the Epley formula (weight × (1 + reps/30)). Enter the weight lifted and reps performed to estimate your maximal strength for programming powerlifting and strength training.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Calculate your one-rep max using the Epley formula (weight × (1 + reps/30)). Enter the weight lifted and reps performed to estimate your maximal strength for programming powerlifting and strength training

Each component has a specific meaning:

  • Epley formula ) — The epley formula ) recorded for the scenario being assessed.

Note: Interpret the 1rm epley result against the thresholds and context described above.

How to Use

Enter the Epley formula ) for the scenario you are assessing. Calculate your one-rep max using the Epley formula (weight × (1 + reps/30)). Enter the weight lifted and reps performed to estimate your maximal strength for programming powerlifting and strength training. Use the 1rm epley result to inform your calculation.

Frequently Asked Questions