Use this 1RM Calculator to estimate your one-rep max (1RM) based on your workout performance. Determine your maximum strength potential for exercises like bench press, squat, and deadlift with this easy-to-use tool!
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What is 1RM (One-Rep Max)?
One-Rep Max (1RM) is the maximum amount of weight you can lift for a single repetition of a given exercise — like a bench press, squat, or deadlift. It’s a key measurement of your maximal strength in resistance training.
Why calculate your 1RM?
Knowing your 1RM helps you tailor your training program. Many workout plans use percentages of your 1RM to define sets, reps, and load. For example, lifting 70% of your 1RM for 10 reps can help with hypertrophy (muscle growth).
How is 1RM estimated?
While the most accurate way to know your 1RM is to test it in the gym, this calculator uses formulas like the Epley or Brzycki equation to estimate your max based on the weight and number of reps you can perform. This approach is safer and easier for most people.
Safety tip:
Always warm up properly and use a spotter when attempting heavy lifts. If you're new to strength training, consult a coach or start with submaximal efforts to build your technique and confidence.
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