Why estimate
Testing a true max takes good technique and carries risk. The formulas estimate it from a set with more reps; they work best between 2 and 10 reps.
Example
135 lb for 8 reps gives an estimated 1RM of about 169 lb.
Results are estimates for healthy adults and do not replace advice from a doctor, dietitian or trainer.
Frequently asked questions
Does it work for any exercise?
It works best for the main lifts: bench press, squat and deadlift.
See also
Results are estimates for information only and are not financial, legal or medical advice. Rates, taxes and fees vary — confirm with a professional or your lender.