RackMath Barbell Calculator 4+

Plate math made easy

Classy Jackal Inc

    • 4.8 • 385 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

4.8 out of 5
385 Ratings

385 Ratings

alligator allie ,

Great (one suggestion)

Most importantly, this is an amazing app. The ability to calculate 5/3/1 percentages (using 90% of your 1RM for your training max) is very useful. One suggestion for a streamlined experience, as someone who calculates many weights at a time, instead of having a pop up that tells you how much weight has been rounded off (that you have to click away), implement that weight into the screen somewhere.

Dejavu_21 ,

This app HAS Potential..BUT

I downloaded the free version to check it out. I liked it, but I have a #35 bar that I use for overhead movements and so I purchased the upgrade. When I load #155 on the bar (45&15’s on each side plus the 35lb bar) it works great. But when I move to #185 it says I don’t have the inventory. I guess it will not remove the 45’s and replace them with 35’s 25’s and 15’s to make it work. If I remove the 45’s from inventory it works, but I should not have too. The app should save me time. The app does not work properly and until the bugs are fixed, I have to give it 2 stars. If this is fixed this will be a 5 star app no doubt.

LaurieBartolo ,

Love it!

I wish I knew about this app sooner! The app works very well and is a huge time saver. I want to focus on lifting during my workout, not math. The premium version is well worth it. I have several different bars that I use and the premium version lets me easily add them to my inventory and select them for loading. Easy and intuitive to navigate. Highly recommend!

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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