% do 1RM para Reps
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The 1RM Percentile Calculator for Reps helps determine the percentage of your 1RM (one-repetition maximum) based on the number of repetitions you can perform with a given weight. The 1RM is the maximum weight you can lift only once. This tool is especially useful for those who train with weights and seek to optimize their workouts.
The calculator uses a formula based on research and studies on strength training. The idea is that for a specific number of repetitions, there is an approximate percentage of 1RM that can be lifted. For example, 5 to 10 repetitions typically correspond to 75-80% of 1RM. This helps plan more effective and safe workouts.
When to use this calculator? Whenever you need to set weights for your workouts based on the desired number of repetitions. It is useful for both beginners and experienced athletes, as it helps adjust the training load according to strength and fitness goals.
Care must be taken when using the calculator, as 1RM can vary significantly from person to person and can also change for the same individual over time, depending on the level of fitness and type of training performed.
Frequently asked questions
What is 1RM?
1RM is the maximum weight you can lift only once.
How does the relationship between repetitions and percentage of 1RM work?
There is an approximate relationship between the number of repetitions and the percentage of 1RM. For example, 5-10 reps correspond to 75-80% of 1RM.
Can I use this calculator for any type of exercise?
Yes, the calculator can be used for any exercise that has a defined 1RM, but it is most commonly used in strength exercises like bench press, squat, and deadlift.
Does the calculator consider my experience and fitness level?
Not directly, but it's essential to adjust the 1RM value according to your current experience and fitness level.
Can I use this calculator to train with weights at home?
Yes, it can be used to train at home or anywhere, as long as you know your 1RM and the desired number of repetitions.