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Bench Press Calculator (1RM)

Calculate your One Rep Max safely without maxing out.

Bench Press 1-Rep Max Calculator

reps

For best accuracy, enter reps between 1 and 10.

Estimated 1-Rep Max
0 lbs

Calculate Your True Strength

Testing your true 1-Rep Max under a heavy barbell can be dangerous, especially if you train alone without a spotter. It is also incredibly taxing on your central nervous system, requiring days of recovery.

Our Bench Press Calculator solves this problem. By entering a weight you are comfortable lifting for multiple repetitions, we use the proven Epley formula to estimate your absolute maximum strength.

How to use the calculator:

  1. Weight Lifted: Enter the weight you used during a recent heavy set. (You can toggle between lbs and kg).
  2. Repetitions Completed: Enter the number of clean reps you performed. Do not count forced reps where a spotter helped you.

The calculator will instantly output your estimated 1RM. It also generates a handy Training Percentages grid (from 50% to 95%), which you can use to structure your hypertrophy, speed, or heavy sets for your next workout cycle.

Frequently Asked Questions

What is a 1-Rep Max (1RM)?
A 1-Rep Max (1RM) is the maximum amount of weight you can lift for a single repetition of an exercise with proper form. It is the gold standard for measuring raw strength.
Is this calculator accurate?
This calculator uses the Epley Formula, which is widely considered one of the most accurate mathematical models for predicting a 1RM. However, no formula is perfect. It is most accurate when you input a weight you can lift for 1 to 10 reps. Anything above 10 reps decreases the accuracy of the prediction.
Why do I need to know my 1RM?
Most structured powerlifting, bodybuilding, and strength training programs (like 5/3/1, Smolov, or Texas Method) are percentage-based. They dictate that you lift a certain percentage of your 1RM on specific days. Knowing your 1RM allows you to program your workouts safely and effectively.
Does this only work for the Bench Press?
No! While we call it a Bench Press Calculator, the Epley formula applies universally to compound barbell lifts. You can use this exact calculator to estimate your 1RM for the Squat, Deadlift, and Overhead Press.