1 Rep Max (1RM) Calculator

Max Strength Estimation & Training Load Percentages

Lift Parameters

kg
5 Reps
1 Rep (Heavy)5 Reps (Strength)10 Reps (Hypertrophy)20+ Reps
Estimated One Repetition Max
116.7kg

Maximum single-rep capability estimated from 100 kg × 5 reps using the epley equation.

Training Zone & Adaptation

Use for periodized programming
PercentageTarget WeightEst. Reps PossibleTraining Zone & Adaptation
100%116.7 kg~1 rep1RM Max Effort (Strength / Power)
95%110.9 kg~2 repsHeavy Singles/Doubles (Strength / Neurological)
90%105 kg~4 repsPeak Strength / Myofibrillar Hypertrophy
85%99.2 kg~6 repsPrimary Strength & Power Hypertrophy Zone
80%93.4 kg~8 repsClassic Hypertrophy (Muscle Growth)
75%87.5 kg~10 repsHigh-Volume Hypertrophy Zone
70%81.7 kg~12 repsMetabolic Hypertrophy / Muscular Endurance
65%75.9 kg~15 repsEndurance & Conditioning / Deload
60%70 kg~18 repsEndurance / Rehabilitation Work
55%64.2 kg~22 repsHigh Rep Stamina & Recovery Work
50%58.4 kg~25 repsLight Warmup / Active Recovery