One-Rep Max (Brzycki) Calculator
Estimate your one-repetition maximum using the Brzycki equation.
Use proper form and safety precautions when lifting heavy weights.
Examples
- 80 kg for 5 reps ⇒ 90 kg
- 100 kg for 10 reps ⇒ 133.33 kg
FAQ
What is the Brzycki formula?
It estimates 1RM as weight × 36 ÷ (37 − reps).
Is it accurate for high reps?
It's most reliable for 10 reps or fewer.
Can I use pounds?
Yes, input weight in pounds and interpret the result in pounds.
Additional Information
- 1RM helps set training intensities and track strength gains.
- The Brzycki equation is popular in strength coaching.