One Rep Max: 1RM Calculator

Name: One Rep Max: 1RM Calculator
Rating: 4.4 (170 reviews)
Author: Charles Vanderhoff

By: Charles Vanderhoff

Strength Tracker & Gym PR Tool

Features & Capabilities

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.

User Growth & Download Statistics

App Sports Analytics Data Education

By:

Charles Vanderhoff

Rating:

4.40

(170) 1 new ratings

Version:

4.0.16 Last updated: 2026-04-28

Version code:

885037769

Creation date:

2014-12-30

Compatible devices:

Size:

40.89MB

URLs:

Website ,Privacy policy

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-06-06

Compare stats and ranking:

Ranking

# 124,047 ▲ 272

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.

Developed by:

Charles Vanderhoff

Apple Apps Store

https://apps.apple.com/us/app/one-rep-max-1rm-calculator/id950621710

Website:

http://vandersoft.co/one-rep-max-app/

User Reviews

Placing previously available features behind a paywall? Yeah, uninstalled.

by Je*****, 2026-05-24

It definitely does the job. Was 5 stars then it put the percentages/reps behind a pay wall.

by Co*****, 2026-05-14

Super clean and easy to use. I love that it supports multiple 1RM formulas and lets you track progress over time with charts. The plate calculator is a nice bonus. I’ve used a few lifting apps and this is the one I keep coming back to.