One Rep Max (1RM) Calculator
Calculate your theoretical one-rep max and get a detailed breakdown of your lifting percentages.
| Percentage of 1RM | Estimated Reps | Weight |
|---|---|---|
| 100% | 1 | 117 lbs |
| 95% | 2 | 111 lbs |
| 93% | 3 | 109 lbs |
| 90% | 4 | 105 lbs |
| 87% | 5 | 102 lbs |
| 85% | 6 | 99 lbs |
| 83% | 7 | 97 lbs |
| 80% | 8 | 93 lbs |
| 77% | 9 | 90 lbs |
| 75% | 10 | 88 lbs |
| 70% | 12 | 82 lbs |
| 65% | 15 | 76 lbs |
About The One Rep Max (1RM) Calculator
Calculate your theoretical one-rep max and get a detailed breakdown of your lifting percentages for powerlifting and bodybuilding.
Unlike many free tools online, One Rep Max (1RM) Calculator runs entirely inside your browser instead of uploading your health data to a remote server. That means faster results and complete privacy, whether you're tracking fitness or wellness goals on a laptop or a phone.
How to Use
- Open the One Rep Max (1RM) Calculator tool — no sign-up or installation required.
- Enter your input or upload the required file using the tool above.
- Review the live result as it updates instantly in your browser.
- Copy, download, or export your result when you're happy with it.
Frequently Asked Questions
Is One Rep Max (1RM) Calculator free to use?
Yes. One Rep Max (1RM) Calculator is completely free, with no sign-up, no watermark, and no usage limits.
Is my data safe when I use One Rep Max (1RM) Calculator?
Yes. One Rep Max (1RM) Calculator runs entirely in your browser, so your health data stay local on your device and are never uploaded to a server.
How accurate are the results?
The calculator uses standard, widely accepted formulas. Results are estimates meant to guide your decisions and should not replace professional advice.