Quick 1RM Estimate in Kilograms
Use kilograms and a repetition count to inspect two empirical 1RM estimates. This short form explains equation behaviour rather than measuring fatigue, exercise skill or actual maximum strength.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
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How to use this tool
Enter kilograms and completed repetitions. A single repetition returns the lifted weight; at 37 or more, the Brzycki denominator is invalid and that result is not displayed.
Results and examples
Read disagreement as sensitivity to the chosen equation. An Epley value that keeps increasing with high repetitions is not evidence that you can lift it, and should not justify a maximal attempt.
Worked example
Entering 100 kg for one repetition returns 100 kg for both equations.
Limitations
- Technique changes, assisted repetitions and exercise differences are not distinguished.
- Safe training loads and injury risk are not calculated.
Fields
| Field | Guidance and constraints |
|---|---|
| Weight (kg) | Check the unit and format displayed beside this field. |
| Reps | Check the unit and format displayed beside this field. |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Frequently asked questions
Why is one result absent at 37 reps?
The Brzycki denominator is no longer valid.
Do more repetitions make the estimate more accurate?
No. High-repetition extrapolation needs particular caution.
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