1RM Calculator

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Your 1RM is -

1 Repetition Maximum (1RM for short) is the maximum weight that you can lift in a single repetition of an exercise. This value determines your strength levels for a particular exercise.

Last updated: Jun 13, 2024

1RM Calculator - One Repetition Maximum

What is One Repetition Maximum (1RM)?

One Repetition Maximum (1RM) refers to the maximum amount of weight that can be lifted for a single repetition of a given exercise. It is a key indicator of maximal strength, especially for athletes, bodybuilders, and weightlifters, helping track progress and set training goals.

How to Use the Calculator

  • Exercise: Select the exercise you performed (e.g., bench press, squat, deadlift).
  • Weight Lifted: Enter the amount of weight you lifted for your set.
  • Repetitions: Input the number of repetitions you completed at that weight.

The calculator will then estimate your 1RM using the entered data.

How to Measure 1RM?

There are several methods to estimate your 1RM. While the most accurate way is to actually perform the lift with maximum effort, this is not always safe or practical, especially for beginners. Here are some methods to estimate your 1RM:

  • Direct Method: Perform the lift with gradually increasing weight until you reach the maximum weight you can lift for one repetition.
  • Estimation Formulas: Use formulas like the Epley or Brzycki formulas to estimate your 1RM based on the weight lifted and the number of repetitions performed.
  • Online Calculators: Utilize online 1RM calculators, which use different formulas to provide an estimate.

    Below are the most commonly used estimation formulas:
  • Epley Formula: This formula is one of the most commonly used methods to estimate 1RM.

    1RM = weight × (1 + (reps / 30))
  • Brzycki Formula: Another popular formula that provides a reliable estimate of 1RM.

    1RM = weight × (36 / (37 - reps))
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