One Rep Max Calculator
Estimate one-rep max with Epley, Brzycki, and Lombardi and view a percentage table.
Estimated result
Check the entered values.
This is a mathematical estimate, not an instruction to attempt a maximal load.
Three 1RM estimates
Epley, Brzycki, and Lombardi model the relationship between load and repetitions differently.
Percentage table
Percentages use the estimated average as a mathematical reference, not a prescribed session.
Frequently asked questions
Should I attempt 100%?
No. The tool does not recommend attempting a maximal repetition.
Is personal data sent to a server?
No. Calculations run locally in your browser and these values are not stored by default.
Can I use the result as medical advice?
No. It is an educational reference and does not replace individual assessment.
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