One Rep Max Calculator (1RM)

Calculate the maximum weight you can lift for one repetition using Epley, Brzycki, and Lombardi formulas.

Enter data

Weight Lifted (kg)60 kg

Reps Performed8

One Rep Max (1RM) is the maximum weight you can lift for one complete repetition of a given exercise. It's a key metric for strength training.

Epley Formula:

Epley: weight × (1 + reps/30)

Brzycki Formula:

Brzycki: weight × 36/(37 - reps)

Lombardi Formula:

Lombardi: weight × reps^0.10

The table shows weights for different training goals: 85-100% for strength, 67-85% for hypertrophy (muscle growth), below 67% for endurance.

This calculator provides an estimate. Never attempt an actual 1RM without a spotter and proper warm-up.

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