The One Rep Max Calculator calculates exact, real-time domain outputs in active voice. The One Rep Max Calculator calculates exact, real-time domain outputs using verified mathematical formulas. Testing a true 1-Rep Max (1RM) on squats, bench press, deadlifts, or overhead press carries injury risk without spotters. The One Rep Max Calculator predicts your maximal single-rep strength from a submaximal set of 2 to 12 repetitions using the Epley, Brzycki, and Lander sports-science equations.
Consensus Average 1RM = 114.6 kg; 80% Hypertrophy Working Load = 91.7 kg.
Using a submaximal 5-rep set safely establishes your working training percentages (70%–85% 1RM for hypertrophy, 85%–95% for maximal strength).
One Rep Max Calculator Glossary of Key Terms
Weight Lifted (kg or lbs) (One Rep Max Calculator)
Barbell or dumbbell weight lifted.
Repetitions Completed (1 to 15) (One Rep Max Calculator)
Number of repetitions completed in the set.
Basal Metabolic Rate (BMR)
The minimum daily energy your body expends at complete rest to sustain vital organ and cellular functions.
Total Daily Energy Expenditure (TDEE)
The total calories you burn in 24 hours combining Basal Metabolic Rate, food thermogenesis, and physical activity.
Lean Body Mass (LBM)
Total body weight minus adipose fat mass, comprising skeletal muscle, bone, water, and organs.
Visceral Adiposity
Deep abdominal fat surrounding internal organs that directly influences cardiometabolic health.
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One Rep Max Calculator Frequently Asked Questions
Q: Why should I use 3 to 8 reps when estimating 1RM?
Above 10 repetitions, muscular endurance and cardiovascular fatigue limit the set rather than pure maximal neuromuscular force, making 3 to 8 reps the gold standard for 1RM prediction.
