Guides

Short, sourced explanations of the numbers behind the calculators.

• 1RM Formula Guide

  The six one rep max formulas side by side, rep by rep: where each reads high or low, why they disagree, and when an estimate stops being reliable.

• How to Test Your 1RM Safely

  A step-by-step protocol for testing a true one rep max, based on NSCA guidance: who should test, how to warm up, how to choose attempts, and when to stop.

• What Is a Training Max?

  A training max is a deliberately lower number, usually 90% of your 1RM, used to set training weights. How to calculate it, 85% vs 90%, and when to raise it.

• What Is 1RM?

  What 1RM (one rep max) means, how to find yours by testing or estimating from a set of reps, a worked example, and how lifters use it to set weights.

• Methodology

  Exactly how every number on 1RMHub is calculated and rounded.