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Frequently Asked Questions
What is one-rep max (1RM)?
One-rep max is the maximum weight you can lift for one complete repetition of an exercise. It's a measure of your maximum strength for that particular movement.
How is 1RM calculated?
We use the Epley formula: 1RM = Weight × (1 + Reps/30). This formula estimates your 1RM based on the weight you can lift for a given number of repetitions.
Why is the rep range limited to 1-12?
The Epley formula is most accurate for rep ranges of 1-12. Beyond 12 reps, the formula becomes less reliable because it doesn't account for endurance factors that come into play with higher rep ranges.
How accurate is this calculation?
The Epley formula provides a good estimate but may vary by ±5-10% from your actual 1RM. Individual factors like training experience, muscle fiber type, and exercise technique can affect accuracy.
How should I use my 1RM for training?
Use your 1RM to calculate training percentages: 70-80% for strength training, 60-70% for hypertrophy, and 50-60% for endurance. Always warm up properly and use proper form when testing or training near your 1RM.
Important Disclaimer
For informational purposes only: This calculator provides estimates and should not be considered as professional advice.
Accuracy: While we strive for accuracy, users should verify results independently for critical decisions.