Advanced One Rep Max Calculator

Calculates your true strength potential using RPE Autoregulation & Smart Algorithms.

Lift Type

Weight Lifted

Reps Performed

RPE (Exertion) 10 (Max Effort)

Easy (6) Standard (8-9) Failure (10)

Unit

Algorithm

Your Estimated One Rep Max

0 lbs

Visual Plate Loader (One Side)

Rep Max Planner

Target specific reps?

Strength Curve

Why This is the Best 1RM Calculator

Most online calculators have a fatal flaw: they assume every set you do is taken to absolute failure (RPE 10). Our "Advanced Strength Intelligence" engine allows you to input your Rate of Perceived Exertion (RPE).

Understanding the "Smart Estimate"

No single formula is perfect for every lift. Our Smart Consensus engine dynamically weighs the most accurate formulas based on scientific research:

Epley Formula: Prioritized for Squats and Deadlifts (Lower Body).
Brzycki Formula: Weighted higher for Bench Press (Upper Body).
Lombardi/Mayhew: Used for higher rep sets (15+) to account for metabolic endurance.