Health
One Rep Max Estimator
🔒 Runs in your browser
Estimate your one-rep max (1RM) using four formulas — Epley, Brzycki, Lander, and Lombardi — with a side-by-side comparison and training percentage breakdown. Free, instant, runs in your browser.
Formula
Most widely used. Accurate for moderate rep ranges (3–10).
How to Calculate Your One Rep Max (2026)
How to Calculate Your One Rep Max — free online tool and guide with examples.