FREE STRENGTH CALCULATOR
Estimate your one-rep max without testing a true maximum.
Enter a recent working set of 1–12 controlled repetitions to estimate your 1RM and useful percentage-based training loads.
Estimated with the Epley formula. Avoid attempting a true maximum without appropriate experience, technique and safety equipment.
What a 1RM estimate tells you
An estimated one-rep max gives you a common reference for strength progress and programming. It is especially useful when testing a true maximal lift would add unnecessary fatigue or risk.
Why estimates vary
Technique, exercise choice, fatigue, repetition speed and individual strength endurance affect the result. Compare estimates from the same movement and similar conditions.
Track personal bests responsibly
A new best can be more weight for the same reps, more reps with the same weight or an improved estimated 1RM. EvolveForm’s workout logger records these strength milestones inside Personal Bests.