Free Tool
Bench Press 1RM Calculator
Enter the weight you lifted and how many reps — get your estimated one-rep max instantly using the Epley and Brzycki formulas.
Enter weight and reps above
What is a 1RM?
Your one-rep max (1RM) is the maximum amount of weight you can lift for a single repetition of an exercise with proper form. It's the universal benchmark for measuring strength progress in bench press, squat, and deadlift.
Formulas Used
Epley Formula
1RM = weight × (1 + reps ÷ 30)
Brzycki Formula
1RM = weight × 36 ÷ (37 − reps)
Both formulas are most accurate for sets of 2–10 reps. Above 10 reps, accuracy drops. This calculator shows both estimates and averages them for a conservative result. For the most accurate 1RM, test it directly with a spotter.