How it works
Your one-rep max (1RM) is the heaviest weight you can lift once. We estimate it from a set of up to 12 reps with the Epley formula and show loads for strength and hypertrophy training.
Frequently asked questions
Is testing a true 1RM safe?
It can be risky without experience and a spotter. Estimating from a 3–10 rep set is safer for most people.
These calculators give estimates for general guidance only and are not medical advice. Please consult a doctor for health concerns.