One-Rep Max Calculator
One-Rep Max Calculator helps you calculate one-repetition maximum estimate quickly with transparent formulas.
Formula
1RM = W(1 + reps/30)
Step-by-step
- Use Epley equation.
Example
Using default values, result: Estimated 1RM 101.33 kg
Frequently asked questions
How accurate is the One-Rep Max Calculator?
Results are estimate-grade and depend on your inputs and assumptions.
Can I use One-Rep Max Calculator for professional decisions?
Use this as guidance and verify with a qualified professional when stakes are high.
For educational purposes only. Results are estimates, not professional advice.
Last reviewed: 2026-07-14