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

4.8 out of 5
23 Ratings

23 Ratings

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.

ccourtypie ,


this app is super easy to use! you won't be disappointed.

2847638 ,

Free for men, ladies pay

Free version is 45 lb bar, can’t get a 35lb bar unless you pay for it’s even available then. Wow, thanks a lot


Classy Jackal Inc
23.3 MB

Requires iOS 13.2 or later. Compatible with iPhone, iPad and iPod touch.



Age Rating
In-App Purchases
  1. Premium Upgrade $3.99


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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