Exercise
One Rep Max (1RM) Calculator
Get an estimated 1RM without testing all the way to failure. Plug in the weight and reps you did, see your max and percentages.
FAQ
How accurate is this? +
Within 5–10% for most people, most lifts. Most accurate at 3–8 reps. Above 10 reps the estimates start to overshoot.
Which formula should I trust? +
All three. We average them. Brzycki is best for 1-10 reps. Epley is more forgiving at higher reps. Lombardi splits the difference.