# One Rep Max: 1RM Calculator

> Strength Tracker & Gym PR Tool

Canonical page: [https://chrome-stats.com/d/id950621710](https://chrome-stats.com/d/id950621710)

## Overview

- **ID:** `id950621710`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Charles Vanderhoff
- **Category:** Health & Fitness
- **Rating:** 4.40 / 5 (182 ratings)
- **Version:** 4.0.22
- **Last updated:** 2026-07-30
- **First published:** 2014-12-30
- **Size:** 48 MB
- **Data as of:** 2026-09-20
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/one-rep-max-1rm-calculator/id950621710)
- **Website:** [http://vandersoft.co/one-rep-max-app/](http://vandersoft.co/one-rep-max-app/)
- **Privacy policy:** [http://vandersoft.co/privacy-policy](http://vandersoft.co/privacy-policy)

## Description

One Rep Max: 1RM Calculator is a Chrome extension that helps serious lifters estimate max strength safely. It supports seven scientific formulas (Epley, Brzycki, Lombardi, Mayhew, McGlothin, O'Conner, Wathan), optional RPE integration, unlimited exercise tracking, and clear progress visuals.

Track any lift, view progress with charts and percentages, set goals, and monitor your strength journey over time. Designed for powerlifters, CrossFit athletes, Olympic weightlifting, and enthusiasts, with a science-based approach and safety guidance.

## Rankings

- #110,433 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id950621710)