Strength
One-Rep Max Calculator
Estimate a 1RM from a hard set using the Epley formula. Use it to pick working weights, not to ego-load.
Hunter: If the last rep was ugly, do not trust the number. Clean reps only.
Epley in plain English
Weight times (1 + reps / 30). A 225 x 5 set estimates about 262. Best used for sets of 10 or fewer.
FAQ
Should I test a real max?
Most people do not need to. Estimated 1RM is enough to set percentages and track progress in Engine.