About OneRepMax HQ

OneRepMax HQ is a small set of free calculators for people who lift: a one rep max calculator, lift-specific versions for the bench press, squat and deadlift, an RPE calculator and a percentage chart.

How the numbers are made

The calculators use published, peer-reviewed estimation formulas — Epley, Brzycki, Lombardi, Lander, O'Conner, Mayhew and Wathen — and the widely used RPE percentage chart. Every formula and assumption is documented in 1RM formulas explained. Everything is calculated in your browser; nothing you type is sent to us.

How the site is funded

The site is free to use. It may show advertising and may contain affiliate links: if you buy something through such a link, we may earn a commission at no extra cost to you. Advertisers do not influence the calculators or the content.

Important

The results are estimates for training purposes. They are not medical, physiotherapy or coaching advice. Lift within your abilities and consult a qualified professional if you have any health concerns.

Questions or corrections? Get in touch.