1RM calculator
Enter the weight and reps of one set to estimate your one-rep max and get loads at common percentages.
Estimated 1RM
90.0kg
Epley 93.3 · Brzycki 90.0 kg
100%90.0 kg
95%85.5 kg
90%81.0 kg
85%76.5 kg
80%72.0 kg
75%67.5 kg
70%63.0 kg
65%58.5 kg
60%54.0 kg
How it works
Epley: weight × (1 + reps ÷ 30). Brzycki: weight × 36 ÷ (37 − reps). The result and the load table use the lower of the two.
FAQ
Why only 1–10 reps?
Above ten reps endurance dominates and the formulas drift. Heavy sets of 3–6 reps give the best estimate.
Should I try this weight?
An estimate is not what you can lift today. Testing a true max needs a full warm-up and a spotter.