How to use the One Rep Max Calculator
Estimate estimated one-rep max from lifted weight, repetitions with the One Rep Max Calculator. It includes Epley, Brzycki, Lander, Lombardi workflows, so choose the one that matches the values you actually know. Use it to understand an educational estimate and the inputs behind it, not as a diagnosis or treatment decision.
Step by step
- For the One Rep Max, enter lifted weight, repetitions. Keep each value in the unit displayed beside its field.
- Review the selected One Rep Max workflow and inputs, then read estimated one-rep max in the result panel.
- Change one One Rep Max assumption at a time to compare scenarios. Use Reset to restore this tool's worked example values.
How the calculation works
Selectable Epley, Brzycki, Lander, and Lombardi one-repetition maximum estimates.
Worked example
In the One Rep Max worked example, lifted weight 100 kg, repetitions 5 produces estimated one-rep max of 116.7 kg. Epley equation. Review the displayed units before comparing the result.
Understanding the result
The One Rep Max reports estimated one-rep max. Use it to understand an educational estimate and the inputs behind it, not as a diagnosis or treatment decision. Educational estimate only; it cannot diagnose a condition or replace advice from a qualified health professional.
How to check the answer
Check the One Rep Max estimate by confirming the units and supported ranges for lifted weight, repetitions. Compare estimated one-rep max with another published method or direct measurement when available, and ask a clinician before using it for a health decision.
Common questions
What does the One Rep Max calculate?
Estimate estimated one-rep max from lifted weight, repetitions with the One Rep Max Calculator.
Which One Rep Max inputs have the biggest effect?
estimated one-rep max responds directly to lifted weight, repetitions. Change one input while holding the others constant to see its effect.
Is the One Rep Max result exact?
Educational estimate only; it cannot diagnose a condition or replace advice from a qualified health professional. Recheck lifted weight, repetitions and use estimated one-rep max only for a decision where that level of precision is appropriate.