One Rep Max Calculator
Estimated one-rep max from a lifted weight and rep count, plus a training load table.
Your result appears here
Fill in the fields on the left and press Calculate. The answer, the breakdown and a copy button all land in this card.
How it is calculated
1RM = weight × (1 + reps ÷ 30)
The Epley formula is most accurate under about 10 reps — high-rep sets tend to overestimate the true one-rep max.
Worked example
60 kg for 8 reps estimates a one-rep max of 76 kg.
Questions people ask
Treat it as a training estimate, not a target to load and attempt cold. Real max attempts need a proper warm-up and, ideally, a spotter.
Epley, Brzycki and others fit the same idea — fatigue rises with reps — to slightly different curves. They typically agree within a few kilograms.