Calculating your One Rep Max (1RM) allows you to program strength training blocks and calculate target percentages (e.g. 80% 1RM) without performing maximum single lifts that carry high fatigue.
One Rep Max Calculator (1RM)
Reviewed
ResultUpdates as you type
1RM Max Weight115.1 kg
Epley Formula116.7 kg
Brzycki Formula112.5 kg
- 95% 1RM (2 Reps)
- 109.3 kg
- 90% 1RM (4 Reps)
- 103.6 kg
- 85% 1RM (6 Reps)
- 97.8 kg
- 80% 1RM (8 Reps)
- 92.1 kg
- 75% 1RM (10 Reps)
- 86.3 kg
- 70% 1RM (12 Reps)
- 80.6 kg
Calculate your maximum 1RM lift for bench press, squat, and deadlift using Epley, Brzycki, and Lander formulas.
Estimate your maximum one-rep max (1RM) strength for bench press, squat, or deadlift without risking injury.
How to use
- Choose kilogram or pound units.
- Enter the weight you lifted.
- Enter the number of completed repetitions (1 to 12).
- View your 1RM max estimate and percentage training table.
Formula
Popular scientific equations estimate your maximum 1RM based on sub-maximal weight and reps.
Epley Formula
1RM = weight · (1 + reps / 30)Brzycki Formula
1RM = weight · (36 / (37 - reps))Lander Formula
1RM = (100 · weight) / (101.3 - 2.67123 · reps)Frequently asked questions
What is a One Rep Max (1RM)?
One Rep Max is the maximum amount of weight you can successfully lift for a single repetition of an exercise.
How many reps should I use to calculate 1RM?
Formulates are most accurate when using 2 to 6 repetitions performed to near failure.