RackMath Barbell Calculator 4+

Plate math made easy

Classy Jackal Inc

    • 4.6 • 44 Ratings
    • Free
    • Offers In-App Purchases



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.


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.

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.

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.


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.

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

What’s New

Version 1.6

Minor bug fixes.

Ratings and Reviews

4.6 out of 5
44 Ratings

44 Ratings

Josh Moxey ,


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.

Weary Northson ,


I love this app. I use it before every CrossFit workout to plan what plates I’m going to need for my lifts. My ability to do simple math goes down the harder the workout. This app takes away that problem - it’s visual, just load the plates it’s showing you. There’s a ton of great features in this app as well. An excellent app, well thought out and easy to use.

amspart ,

Pink Tax

So if you’re a woman you have to pay for the app so you can use the calculator with a 35lbs bar. That seems flawed.

App Privacy

The developer, Classy Jackal Inc, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer's privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.

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