One Rep Max Calculator

Estimate your one-rep maximum for any lift.

Your One Rep Max

Estimated 1RM 0 kg

How the One Rep Max Calculator Works

Our One Rep Max Calculator estimates the maximum amount of weight you can lift for a single repetition of a given exercise.

What Is One Rep Max?

Your one-rep max (1RM) is a measure of your maximal strength. It is a popular metric used by strength athletes to gauge their progress.

How This Calculator Determines Your One Rep Max

  1. Input Your Details: Enter the weight you lifted and the number of repetitions you performed.
  2. 1RM Calculation: The calculator uses the Brzycki formula to estimate your 1RM.

Why Use a One Rep Max Calculator?

Using a one rep max calculator can help you:

  • Track Your Strength Gains: Monitor your 1RM over time to see how your strength is improving.
  • Design Your Training Program: Many strength training programs are based on percentages of your 1RM.