One-rep max calculator
Enter a recent set — the weight and how many clean reps you did — and get your estimated one-rep max (1RM).
kg
Enter your numbers to see the result.
How it works
No formula knows your true max, but they get close when the set was hard. This calculator averages two of the most used formulas, Epley and Brzycki, which together match the classic percentage chart: about 87% of your max for 5 reps and 75% for 10.
For the best estimate, use a set taken close to failure with good technique. The more reps, the rougher the estimate.
Track every lift in Capazity
Log your sets, watch your maxes climb and let the app calculate the weights for every session.