Calculadora de 1RM (Carga Maxima)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
Epley: 1RM = peso × (1 + reps/30) | Brzycki: 1RM = peso / (1,0278 − 0,0278×reps)
About this calculator
The 1RM Calculator estimates your one-repetition maximum (1RM) for weightlifting exercises. It uses two popular formulas: Epley and Brzycki. Epley's formula calculates 1RM as weight multiplied by (1 + reps/30). Brzycki's uses weight divided by (1.0278 − 0.0278 × reps). The result is a reliable approximation, but it does not replace an actual maximum load test.
Use this calculator when planning your training based on your maximum strength, especially for exercises like bench press, squat, or deadlift. It helps with load periodization, injury prevention, and progress tracking. Enter the weight used and the number of reps performed until failure (or near it) to get the estimate.
Important precautions: the formulas are most accurate for reps between 1 and 10. Above that, error increases. Also, factors like fatigue, technique, and exercise type affect the result. Use the calculator as a reference, but always prioritize safety when testing actual maximum loads.
Frequently asked questions
Which formula is more accurate, Epley or Brzycki?
Both are accurate for low reps (1 to 10). Brzycki tends to be slightly more conservative, while Epley may overestimate a bit. Test both and see which matches your actual max.
Can I use it for dumbbell exercises?
Yes, as long as the movement is similar to barbell. For unilateral exercises, calculate 1RM for each side separately.
How many reps should I use in the calculation?
Ideally, use the maximum reps you can do with a weight, until failure. The closer to failure, the more accurate the result.
Does the calculator work for reps above 10?
It works, but accuracy decreases. For more than 10 reps, consider using specific endurance formulas, like Lombardi.
Do I need to warm up before testing my actual 1RM?
Yes, always warm up properly. Testing 1RM without warming up increases injury risk. Perform progressive sets before the attempt.