1RM Calculator - One Rep Max

Name: 1RM Calculator - One Rep Max
Rating: 4.5 (221 reviews)
Author: David Bai

By: David Bai

Util for estimating max lifts

Features & Capabilities

1RM Calculator helps you determine your 1-rep max by entering the weight you lifted and the reps you performed to see an estimated max. It also lets you compare different rep schemes and track your strength progression over time.

Note: This tool provides estimates. Always warm up and use a spotter for safety. Pro Version includes ad-free usage, saved lifts and history charts, more formulas, multiple maxes (up to 10), lbs/kg switch, and a percentage view from 50% to 125% of your 1RM.

User Growth & Download Statistics

App Sports Education

By:

David Bai

Rating:

4.50

(221)

Version:

4.5 Last updated: 2019-05-20

Version code:

831364861

Creation date:

2013-08-10

Compatible devices:

Size:

20.49MB

URLs:

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-06-06

Compare stats and ranking:

Ranking

# 110,931 ▼ 50

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:

David Bai

Apple Apps Store

https://apps.apple.com/us/app/1rm-calculator-one-rep-max/id681279192

User Reviews

Users broadly praise the app for being simple and fast to calculate 1RM and to show quick percentages, making workout planning easier. However, a large portion report paying for the Pro upgrade only to find features not unlocked or the app crashing when accessing paid features. The Pro/paywall presents reliability and usability frustrations, with several calls for ongoing support and updates. Overall, the app delivers a lightweight, straightforward 1RM calculator, but its monetization-linked bugs and stability issues significantly undermine user experience.

Pros

Simple, fast to use for calculating 1RM.
Provides immediate 1RM value and percentage outputs for quick reference.
Useful for planning workouts and tracking progress.
Highly regarded as a solid, lightweight max-rep calculator.

Cons

Pro upgrade often does not unlock features after payment.
Upgrading can cause crashes or make the app unusable when accessing paid features.
The free version appears limited and relies on Pro for core functionality (paywall concern).
General instability and glitchy behavior reported by users after upgrades.