One-Rep Max

Know Your Strength.

Don’t risk injury maxing out every week. Input your best lift weight and reps to safely estimate your true 1RM. This is essential for properly programming your strength training percentages.

One-Rep Max (1RM) Calculator

Estimate your max lift and training percentages without maxing out.

Weight Lifted (lbs)

Reps Performed

Most accurate at 1-10 reps. Above 10-12 reps, strength estimates get unreliable.

Disclaimer: This tool is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Estimated One-Rep Max

0 lbs

Average of the Epley and Brzycki formulas.

% of 1RM	Weight	Typical Use

Formula-based estimates can be off by ~5-10% depending on the lift and your fatigue that day. Treat this as a training guide, not a guarantee — always warm up properly before attempting a real max.