Changing what apps are available to add to the control center

The reason you can't add a calculator to the Control Center on the iPad is because the iPad software does not include a calculator. At this time, Apple doesn't allow you to add third-party apps to the Control Center.

You can let Apple know your thoughts here:

Product Feedback - Apple

Settings>Control Center>Customize. If it’s in there you can add it, if not, there is no way to add your own. Let Apple know that you would like to be able to add them on your own.

Feedback - iPad - Apple

iPads have never, EVER shipped with an iOS calculator app.

Find a third party iOS calculator app in the iOS App Store and use that.

A WHOLE LOTTA of great calculator apps available from third party developers in the iOS App Store.

Best of Luck to You!

TrishO421 wrote:

What I don’t understand is the calculator app is on the iPad preloaded when I bought it you just can’t add it to the control center which is absolutely stupid

As noted, your iPad didn't come with a calculator app preloaded unless someone loaded apps onto it before you got it. And, yes, while there are lots of great third party apps, they can't, at this time be added to the Control Center.

There has never been a pre installed calculator app on any iPad, only on the iPhone. Check here.

iPad Pro - Technical Specifications - Apple

There is no Calculator app on the iPad. Never has been.

You can use the spotlight search or Siri to perform calculations on the iPad. Or download a 3rd party Calculator app.