One-rep max calculator
Not medical advice: this tool is a general lifestyle estimate and does not replace professional medical advice.
Search and use guide
One-rep max calculator
Estimate one-rep max and training zones from a weight and rep set you completed. privacy-first-browser-tooling
Who it helps
- Enter the lifted weight and reps to get an estimated 1RM and common percentage training loads.
- The first release uses the common Epley approximation: 1RM = weight x (1 + reps / 30).
- lifting 80 kg for 5 reps estimates a 1RM of about 93.3 kg.
What you can enter
- lifting 80 kg for 5 reps estimates a 1RM of about 93.3 kg.
- The first release uses the common Epley approximation: 1RM = weight x (1 + reps / 30).
How to read results
The first release uses the common Epley approximation: 1RM = weight x (1 + reps / 30). privacy-first-browser-tooling
Data and privacy
GoGo Tools records analytics by tool slug only and does not include your input values. privacy-safe-analytics-only
Feedback
How can we improve this tool?
Send a suggestion or bug report for this tool.
FAQ
Is my data uploaded?
No. This tool processes your input in the browser. Analytics events record only the tool slug.
Is this medical advice?
No. Results are general lifestyle estimates and do not diagnose, treat, or replace professional medical advice.
Can I download or copy the result?
Most tools provide copyable text. Checklist or table tools provide plain text or CSV downloads.
Does it work on mobile?
Yes. Tool pages are responsive for phones and desktop browsers.