The much-anticipated Crosby Sling Calculator is now available as an app for your iPad or iPhone! With over 15 calculators, this app is packed with utilities to aid you in determining sling tensions, calculating a load's center of gravity, and computing the volume and weight of a load. Users of our popular PC-based Sling Calculator will find all of the functionality, and more, here in this newest addition to our suite of apps by The Crosby Group.

For determining sling tensions, you can choose one of four common bridle configurations, specify the load's dimensions, directly specify or calculate the weight, and indicate the hitch parameters. The results are viewable in the app, and can then be emailed to you as a clear and concise printable PDF file, complete with a diagram and all of the load's dimensions, weight, and hitch information. You can choose between a 2-Leg Bridle, a 4-Leg Bridle, or a hitch with a Moveable Center of Gravity in a 2-Leg or 4-Leg Bridle configuration.

For calculating the load's center of gravity, you can choose between two different methods: by specifying the end weights of a given load, or by specifying the locations and weights of up to four loads placed upon a single pallet. By dragging and dropping, you can place a load in each of the four quadrants of the pallet, indicate the weight for each, and the Crosby Sling Calculator will determine the Center of Gravity for the entire pallet. Or, specify the weight of a single load as it is lifted onto each end, and determine the Center of Gravity that way. Either way, you can view the results and use the load for a 4-Leg Bridle hitch, or email the results as a PDF file.

For computing the volume and weight of a load, you can choose between 9 different load shapes, indicating the dimensions and materials for each. Choose from over 50 common materials, or specify your own material properties. The Crosby Sling Calculator will compute the volume and the weight for the load, which can be viewed in the app, and the results can be emailed as a PDF.

By specifying your preferences when the app starts for the first time, or any time you are on the home screen, you can choose to work with the Crosby Sling Calculator in Feet and Inches, Decimal Feet, or Metric units, and indicate your preference for Horizontal Sling Angles (ASME) or Vertical Sling Angles (CEN). The Crosby Sling Calculator also displays tutorial messages, which you can turn off individually, or all at once from the app preferences. By indicating your default email address, you can send your PDF files directly to your inbox with just a single tap on the screen!

Here are the calculators that you get with the Crosby Sling Calculator:

Sling Tension Calculators:

* 2-Leg Bridle
* 4-Leg Bridle
* 2-Leg Bridle (Moveable COG)
* 4-Leg Bridle (Moveable COG)

Center of Gravity Calculators:

* End Weights
* Pallet

Volume and Weights Calculators:

* Box (or Wedge)
* Box Non-Solid
* Cone
* Hollow Cone
* Cylinder
* Hollow Cylinder
* Sphere
* Hollow Sphere
* I-Beam

Use the same app on both your iPad and iPhone! The app has a separate, appropriately scaled interface for each device, so the iPad interface isn't just a pixilated version of what you will see on the iPhone.

What’s New

Version 6.0.5

Minor bug fixes
Update to 64-bit compliance

Ratings and Reviews

4.0 out of 5
2 Ratings

2 Ratings

Creative Problem Solver ,

Might need to Delete App and Re-Download

I downloaded the 6.0.3 update, and got it to work!!!

At first, I had the same problem as another reviewer, where it wouldn't work after I downloaded it.

Crosby posted a note that this problem might be due to iOS 5.1, which is what both my iPad and iPhone were running.

They said if it happens, to delete the app and re-download it. I did and now it works! (I just had to reset my email address for sending print-outs.)

Kind of a pain, but at least I don't have to wait for an update to fix the problem,

But both Sling Calculators are running great now! I love the new "Back" buttons on the Volume and Weights calculators!

Much better!

4chumley ,


It worked great and after the up date it has stopped working completely.

Please fix ASAP

Quality king ,

Mr. Quality first

What a resource. I thought the version in the Crosby catalog was great, but this has it beat hands down. I travel around the world, and this app let's me work in the local unit of measure. The ability to work in horizontal angles or vertical angles is a real time saver. Thanks Crosby, this is just what I would expect from you.

App Privacy

The developer, The Crosby Group, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

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


The Crosby Group, Inc.
5.5 MB

Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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