🏋️
One Rep Max
Estimate your 1RM for lifting. This tool runs 100% locally in your browser.
Medical Disclaimer: This tool is provided for informational and educational purposes only. It is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
Advertisement
Ad Slot: tool-top
Estimated 1 Rep Max
117
calculated via the Epley Formula
95%
111
90%
105
85%
99
80%
94
75%
88
70%
82
65%
76
60%
70
Advertisement
Ad Slot: tool-bottom
What is One Rep Max?
Estimate your One Rep Max (1RM) without testing it to failure. Enter a weight you can lift for reps, and we'll calculate your theoretical maximum single lift.
Essential for powerlifting and strength training programming.
When to Use This Tool
- 1Planning training cycles (percentages)
- 2Tracking strength progress safely
- 3Bench press/Squat/Deadlift estimation
Formula Used
Brzycki: W × (36 / (37 - R))
Examples
Input
225lbs for 5 reps
Result
Estimated 1RM: ~253lbs
Frequently Asked Questions
Is it accurate?
It is most accurate for rep ranges below 10. For very high reps, the estimation becomes less reliable.
Privacy & Security
Privacy is our priority. Unlike many other online tools, ToolsHub doesn't upload your data to any server. Whether you're processing sensitive text, calculating financial data, or generating passwords, everything stays in your browser.