Herramienta Gratis
Ingresa cualquier peso y repeticiones: obtén tu repetición máxima estimada y la tabla completa de 1 a 10RM al instante.
Track your progress
The web calculator gives you today's estimate. The app saves every result so you can see your strength curve over weeks and months.
Your 1 Rep Max (1RM) is the maximum weight you can lift for a single repetition with good form. It's the universal standard for measuring strength across powerlifting, weightlifting, and CrossFit.
This calculator uses the Epley formula: 1RM = weight × (1 + reps ÷ 30). It's one of the most widely validated 1RM prediction formulas, accurate for rep ranges of 1–10. Beyond 15 reps, accuracy decreases as other factors (muscular endurance, cardio) play a larger role.
Training percentages are typically based on your 1RM. Strength work sits around 85–95%, hypertrophy at 70–85%, and endurance work below 70%. Use the table above to find the right weight for your training goal today.