One Rep Max Calculator

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Estimate your one-rep max from any set of reps, with a weight chart from 50% to 100%.

Weight lifted

Reps completed

Unit

Estimated one-rep max

115.5 kg

Average of three standard formulas

116.7 kg

Epley

112.5 kg

Brzycki

117.5 kg

Lombardi

% of 1RMWeight

100%115.5 kg

95%109.8 kg

90%104 kg

85%98.2 kg

80%92.4 kg

75%86.7 kg

70%80.9 kg

65%75.1 kg

60%69.3 kg

55%63.5 kg

50%57.8 kg

These are estimates from formulas fitted to typical lifters, and they're most reliable for sets of about 10 reps or fewer. A single rep is taken at face value. Actual maxes vary by exercise and person — attempt heavy singles with a spotter and proper warm-up.

Frequently asked questions

Which formulas does it use?

Epley, Brzycki, and Lombardi — three widely used one-rep-max estimators. It shows each one, plus their average as the headline figure.

How accurate is the estimate?

Best for sets of roughly 10 reps or fewer; accuracy drops on high-rep sets, so it only accepts up to 20 reps. It's still an estimate — real maxes vary by lifter and exercise, so attempt heavy singles with a spotter.

What if I only did one rep?

Then that weight is taken as your max directly — the formulas would otherwise overstate a single rep.

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