Fitness & Health Calculators
Client-Side / Zero Latency
One Rep Max (1RM) Strength Calculator
Estimate your maximum single-repetition lift capacity (1RM) using the Brzycki, Epley, and Lombardi formulas along with workout percentage breakdowns (50%-95%).
Loading interactive utility...
Loading One Rep Max (1RM) Strength Calculator...
Initializing client-side engine and local calculation state.
One Rep Max (1RM) Strength Calculator
Safely determine your maximum lifting strength without risking injury on a heavy single attempt in the gym.
Key Features:
- Brzycki, Epley, and Lombardi comparative averages.
- Training percentage table (50%, 60%, 70%, 80%, 90%).
- Kg and Lbs support.
How to Use:
- Enter weight lifted (lbs or kg).
- Enter repetitions performed (1 to 10 reps).
- View estimated 1RM and percentage load chart.
Why Repetition Tests Are Safer Than True 1RMs
Testing a 3-to-5 repetition set provides an accurate mathematical approximation while minimizing spinal compression and joint strain.
Frequently Asked Questions:
The Brzycki and Epley equations are widely recognized as the most reliable for lifts between 2 and 8 repetitions.