Strength estimator (1RM)
Estimate your one-rep max from a normal working set, so you never have to test a true max. Track your own progress.
Strength estimator (1RM)
Enter a hard but clean set you have already done. The tool estimates your one-rep max, so you do not need to lift a true max. Use it to track your own progress.
For trained lifters. Do not max-test without supervision.
Estimated 1RM (average of Epley and Brzycki)
Enter your set and tap the button.
Epley: weight x (1 + reps / 30). Brzycki: weight x 36 / (37 - reps). Both are estimates.
Get a supervised strength programme →Read: best strength exercises for longevity
Educational estimate, not medical advice. If you have heart, joint or blood-pressure problems, get clearance before heavy lifting.
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Open →FAQs
How is estimated 1RM calculated?
Epley estimates 1RM as weight x (1 + reps / 30). Brzycki estimates it as weight x 36 / (37 - reps). Both are rough formulas, most reliable for sets of 10 reps or fewer, and less accurate for high reps or for people new to lifting.
Should I test my true one-rep max?
For most people, no. Heavy max testing carries more injury risk, especially with poor technique, joint problems or heart conditions. This is for trained lifters; do not max-test without supervision. An estimate from a hard set of 3 to 8 reps is safer.
What does the relative strength number mean?
It is your estimated 1RM divided by your bodyweight. It is useful for tracking your own progress over months, since a rising ratio means you are getting stronger relative to your size. It is not a comparison with a population and has no pass mark.
Is this suitable for beginners or older adults?
Beginners should first learn the movement and build up gradually under guidance. Older adults and anyone with a medical condition should have a physiotherapist or doctor review their programme before heavy lifting.
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