Categories

One-Rep Max Calculator

Files stay on your device · 100% private Runs in your browser

Estimate your one-rep max from a lifted weight and reps, with a percentage training table.

How it works: a set taken near failure predicts your one-rep max. Epley and Brzycki are the two standard formulas; they agree best at 6 reps or fewer. The percentage table turns your 1RM into training loads.
Enter a weight and the reps you managed with it.

Related Tools

All Generators tools

Target Heart Rate Calculator

Training heart-rate zones from your age and resting heart rate, by the Karvonen method.

BMI Calculator

Body Mass Index with the WHO category and the healthy weight range for your height.

Body Fat Calculator

Estimate body fat percentage with the US Navy tape method or the BMI-based formula.

Percentage Calculator

Calculate percentages three ways: X% of Y, what percent X is of Y, and percent change.

Age Calculator

Calculate exact age, zodiac sign, and birthday countdown.

Barcode Print & Size Estimator

Calculate physical print dimensions, X-dimension module width, and DPI scaling for thermal and paper barcode labels.

How to Use One-Rep Max Calculator

1

Select or Upload

Choose your file or paste your input into the workspace above. Drag and drop is supported.

2

Configure & Process

Adjust options to fit your task. Processing runs immediately with no waiting queue.

3

Download Result

Preview and save your output in one click with no watermarks or sign-up prompts.

Private & Confidential

Browser tools process files locally on your device, and server temporary files are deleted automatically within 15 minutes.

Free & No Registration

Full access to every utility without creating an account, signing in, or hitting paywalls.

Works on Any Device

Responsive layout that runs smoothly on desktop, tablet, and mobile browsers across all operating systems.

Frequently Asked Questions

Is One-Rep Max Calculator completely free to use?

Yes, One-Rep Max Calculator on KiloToolbox is 100% free with no limits, hidden fees, or account sign-up required.

Are my files safe and private?

Yes. One-Rep Max Calculator processes all files directly inside your web browser using client-side JavaScript and WebAssembly. Your files never leave your computer or mobile device and are never uploaded to any remote server.

Can I use One-Rep Max Calculator on mobile phones and tablets?

Yes, KiloToolbox is fully responsive and runs smoothly on iPhone, Android, iPad, Mac, Windows, and Linux.