F*^k Aging!

Strength After 40

One-Rep Max Calculator

Estimate your one-rep max from a set taken close to failure. Most accurate under about 10 reps.

Uses the Epley formula (1RM = weight × (1 + reps/30)) — an estimate, not a substitute for actually testing a true 1RM under safe conditions (spotter or safety bars). For informational purposes only, not medical or training advice.