fitness performance tool
One Rep Max Calculator
Estimate your absolute muscular strength baseline (1RM) using lift weight and standard repetition outputs.
Interactive Calculator System
100 kg
10 kg500 kg
5
1 12
Real-time Calculated Outputs
Estimated One Rep Max
117lbs/kg
80% Power Target94 lbs/kg
Your estimated 1RM is 117 kg. To build strength, we recommend working with a target of 94 kg for 5 reps.
Methodology & Formula: Epley & Brzycki Formulas
Muscular strength estimations are calculated based on lift weight and repetitions completed.
Estimated 1RM = Weight × (1 + [Reps ÷ 30]).
Standard Reference Calculations
Bench Press (80kg for 5 reps)
Inputs: Weight: 80 kg, Reps: 5
Output: Est. 1RM = 93 kg
Frequently Asked Questions
Get answers to common queries based on clinical literature and fitness research.
Using mathematical estimations is far safer than physically testing an absolute maximum lift, particularly for beginners.