What Is a One-Rep Max (1RM)?
A One-Rep Max (1RM) is the maximum weight load an athlete can lift for a single repetition of an exercise.
One-Rep Max Calculator
One-Rep Max Calculator
Estimated 1-Rep Max (1RM)
114.6 kg
95% 1RM
108.9 kg
90% 1RM
103.1 kg
85% 1RM
97.4 kg
80% 1RM
91.7 kg
75% 1RM
85.9 kg
70% 1RM
80.2 kg
60% 1RM
68.8 kg
50% 1RM
57.3 kg
Frequently Asked Questions
What is a One-Rep Max (1RM)?
1RM is the maximum amount of weight you can lift for a single repetition of a given exercise (such as bench press, squat, or deadlift).
What is the Epley formula for 1RM?
1RM = Weight × (1 + Reps / 30).
What is the Brzycki formula for 1RM?
1RM = Weight × (36 / (37 − Reps)).
How many reps are best for testing 1RM safely?
Testing 1RM using a 3-to-5 rep maximum set is safer than attempting a true single-rep maximum load.
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EverydayFeatures & Highlights
- Epley & Brzycki 1RM Formulas