# RackMath Barbell Calculator — Plate math made easy

> Barbell weight plate calculation and customization tool for fitness. (iPhone/iPad app by Classy Jackal Inc.)

- Source: https://appshunter.io/ios/app/rackmath-barbell-calculator/id1095054017 (this page in markdown: same URL + `.md`)
- Developer: [Classy Jackal Inc](https://appshunter.io/developer/1095054016)
- Category: Health & Fitness
- Price: Free with in-app purchases
- Rating: 4.80/5 from 538 App Store ratings · 71 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.2 · 22 MB
- Languages: American English
- Released: 2016-03-29
- Data updated: 2026-06-10
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/rackmath-barbell-calculator/id1095054017/reviews.md

## What is RackMath Barbell Calculator?

When you’re in the gym, you want to focus on your workout. You don’t want to spend time calculating which weight plates you need to load onto your barbell. RackMath is the simple solution to this problem. It will handle all the plate math for you.

FEATURES

Quick:
Stop doing the math in your head. RackMath calculates the plates you need instantly. Perfect for heavy lifts like the squat, deadlift and bench press.

Safe:
Don’t step into the squat rack with the wrong weight by accident. You can count on the RackMath calculator to make sure you’re loading your bar correctly.

Customizable:
Not everyone has the same set of weight plates. This is why RackMath is designed to let you set your own equipment inventory. Select pounds or kilograms and choose the plates available to you.

Fractional and non-standard weight plates:
Other weightlifting calculators do not include fractional plates or lesser used weight plate denominations. RackMath's inventory offers fractional plates as well as a large number of denominations.

RACKMATH PREMIUM* FEATURES

More bars:
Get access to a variety of bars so you can move beyond the squat rack - use a dip belt, hex bar, leg press machine and EZ curl bars.

More plates:
Increase the plate maximum from 8 plates to 16.

More customization:
Set your bar weight to whatever you desire and customize your plate colors.

Collars:
If you're the type that wants to count every bit of weight, now you can by adding collar weights.

Percent table:
Perfect for pyramids, warm up sets and 5/3/1, you can select a percentage based on the weight you entered.

Reverse calculator:
Load up your bar with whatever plates you want and then see how much weight you're about to lift.

Rep range calculator:
Calculate your theoretical lift weight across reps, from your one-rep max to 30.

No ads:
Take back your screen space with an ad-free experience.

*Requires a one-time in-app purchase

## Key features

- Instant plate calculations
- Customizable equipment inventory
- Supports pounds and kilograms
- Fractional and non-standard plates
- Ad-free experience (premium)
- Percent-based weight calculations (premium)

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Premium Upgrade | $2.99 | one-time |


## What do users think of RackMath Barbell Calculator?

Overall sentiment: positive

**Pros**

- 👍 Easy to use
- 🚀 Simplifies gym math
- 💡 Customizable plate inventory
- 🚀 Speeds up workouts
- 👍 Comprehensive weightlifting tool

**Cons**

- 🐛 Inconsistent math calculations
- 💰 Paywall for basic features
- 🔒 Inability to customize bar weight
- 🔒 Frequent review requests

**Commonly reported bugs**

- Upgrade purchase issues
- Inability to calculate certain weight combinations
- Rounding down instead of providing alternative solutions

**Most requested features**

- Dark mode option
- Blended inventory for metric and imperial plates
- Prep warning before work sets
- Ability to apply inventory to reverse calculator

## Recent user reviews (10 of 71)

All indexed reviews: https://appshunter.io/ios/app/rackmath-barbell-calculator/id1095054017/reviews.md

### 5/5 — I love the app

*2025-03-14, version 1.6*

I been using this app for a while now and I am loving it no more guessing the weight.

### 5/5 — It’s tuff

*2025-02-20, version 1.6*

It’s so Tuff

### 4/5 — Pretty Good With One Flaw

*2024-12-30, version 1.6*

I’ve been using this calculator for a while and while it does the job, the inability to change the color or the plates bugs me. For the plates that are colored yellow, it’s hard to see the number on the plate. They should change the font color on the plate markings to black instead of white so that the numbers are visible. White on yellow just isn’t very visible.

### 5/5 — Excellent

*2023-11-27, version 1.6*

Does what is advertised. It’s great for thinking less at the gym, especially if you listen to podcasts or audiobooks like I do and my brain is already occupied thinking about important things — not how much weight I need to put on the bar.

### 1/5 — Not helpful if you are looking for free option.

*2023-07-24, version 1.6*

Just use chatGPT instead.

I wanted something that would help me keep up with what weight is on the bar. 
Everything you tap on is “upgrade to premium”.

### 5/5 — Must for serious lifter

*2022-09-16, version 1.6*

Has helped me stay focused on gains. I use this app almost every workout, I start by using it for my warm-ups and then for my lifts. I bought the premium upgrade which is really nice for converting to KG and seeing percentages of my working weight for warmups. I wish it had a dark mode, but it does what it is supposed to well.

### 2/5 — Be honest….

*2022-04-22, version 1.6*

If every option is going to be an upgrade just be honest about it.  I got this thinking that I could use it to calculate the plates I needed. Everything was a premium upgrade.  Obviously they just care about the money.  Keep moving on….

### 4/5 — Good not great

*2022-04-01, version 1.6*

Great for the free version but gotta say I had hoped paid would have more features.

### 5/5 — My life before rack math, my life after rack math

*2022-03-28, version 1.6*

I recommend this app to all of my lifting buddies. It’s so simple, so clean, make my lifting life better. 

Thank you to the dev for a great product, at a very reasonable price

-Dennis

### 5/5 — Easy

*2021-12-14, version 1.6*

Love how you can enter in the weights you have and the app uses those to provide you with the easiest way to load the bar for that number. Less mental work while lifting when tired.

## Frequently asked questions about RackMath Barbell Calculator

### What does the RackMath Barbell Calculator do?

This app helps you quickly calculate which weight plates to load onto your barbell for any desired weight. It eliminates the need for manual calculations, allowing you to focus on your workout. You can select your available plates and choose between pounds or kilograms.

### What are the key features of RackMath?

Key features include instant plate calculations, a customizable equipment inventory to match your gym's plates, support for fractional and non-standard plates, and the ability to select between pounds or kilograms. Premium features offer more bars, increased plate capacity, and advanced calculation tools.

### How much does RackMath cost?

The app is free to download and use with basic features. Advanced features, such as more bar options, increased plate capacity, and specialized calculators, are available through a one-time in-app purchase.

### What kind of plates can I use with RackMath?

You can customize your equipment inventory to include the specific weight plates available at your gym. This includes standard plates, fractional plates, and many other denominations. Premium users can increase the number of plates they can load from 8 to 16.

### Who would benefit from using this app?

This app is ideal for anyone who lifts weights at the gym, from beginners to experienced powerlifters. It's particularly useful for those who frequently perform heavy compound lifts like squats, deadlifts, and bench presses, or anyone who wants to ensure accurate weight loading for safety and efficiency.

## Version history (last 5 releases)

### 1.6 — 2019-11-25

Minor bug fixes.

### 1.4 — 2018-10-16

- Minor UI tweak

### 1.3 — 2018-10-09

- iOS 12 compatibility
- rebranding for Happy Lifting Co.

### 1.2 — 2018-05-10

- alternate units displayed on main screen and reverse calc in premium version
- iPad bug fixes

### 1.1 — 2018-03-03

iPhone X support

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## More apps by Classy Jackal Inc

- [TimeSpotter Interval Timer](https://appshunter.io/ios/app/timespotter-interval-timer/id1171535348)
- [Grease The Groove](https://appshunter.io/ios/app/grease-the-groove/id1497802037)

All apps by Classy Jackal Inc: https://appshunter.io/developer/1095054016

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*