Free Online One-Rep Max Calculator
Estimate your one-rep max from a weight and rep count, with training percentages.
| Intensity | Weight | Approx. reps |
|---|
One-rep max estimates are most reliable with 1–10 reps. Always use a spotter and warm up properly before attempting a true max.
About the One-Rep Max Calculator
Free one-rep max calculator. Use the Epley and Brzycki formulas to estimate your 1RM and see percentage training loads.
How to use this tool
Use the controls above to enter your values, choose your options, and view the result. The tool updates as you work, and the result can be copied or downloaded where supported.
Frequently asked questions
Is this tool free?
Yes. Every tool on ImGenerate is free to use and does not require an account.
Is my data safe?
Tools that run entirely in the browser keep your data on your device. Any server-backed lookup is noted in the tool and only sends the information needed for the result.