1RM Calculator

STEP BY STEP

How to use 1rm calculator

1. Enter your measured values in the displayed units.
2. Review the calculation: Epley = weight × (1 + reps / 30); Brzycki = weight × 36 / (37 − reps). One rep returns the lifted weight.
3. Read the result and compare with the example.

WHEN IT HELPS

Common uses

• Check the worked example: 80 kg for 5 reps: Epley 93.33 kg, Brzycki 90 kg.

IN PRACTICE

Example

80 kg for 5 reps: Epley 93.33 kg, Brzycki 90 kg.

GOOD TO KNOW

How many repetitions work best?

Enter 1–10 completed repetitions. Estimates depend on the exercise and proximity to failure; they are not a recommendation to attempt the predicted load.

Epley = weight × (1 + reps / 30); Brzycki = weight × 36 / (37 − reps). One rep returns the lifted weight. Enter 1–10 completed repetitions. Estimates depend on the exercise and proximity to failure; they are not a recommendation to attempt the predicted load.