One Rep Max Calculator

Epley estimate of one-rep max from weight and reps.

One Rep Max Calculator helps you epley estimate of one-rep max from weight and reps. Enter weight lifted and reps completed, review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the One Rep Max calculator does One Rep Max Calculator is built for body measurements, calories, and everyday health math. Epley estimate of one-rep max from weight and reps. You enter weight lifted and reps completed, then Simple Calculators computes the result instantly. These tools use widely published formulas. They are educational screens, not a diagnosis. How the math works Choose your units (pounds or kilograms), then enter the Weight lifted and the Reps completed in that set (1 to 12). The calculator uses the Epley formula: one-rep max = weight × (1 + reps ÷ 30). It then lists training loads from 50% to 95% of that maximum. Estimates are most reliable for sets of about 2–10 reps taken close to your limit. The formula: 1RM = weight × (1 + reps ÷ 30). Most reliable for sets of 2–10 reps.