I can't find the calculator in the ipad

It’s not available for iPad. End of story.

PCalc Lite - The Best Calculator by TLA Systems Ltd.

https://itunes.apple.com/us/app/pcalc-lite-the-best-calculator/id300311831?mt=8

There is not nor ever been a calculator in iOS for the iPad.

Go to the App Store and download one.

That *****. iPhone has a decent calculator app by Apple. What in the world was the problem making it available in iPad?

Here's the reason why the iPad has never had a native Apple Calculator app.

https://www.cultofmac.com/421893/why-the-ipad-has-never-shipped-with-a-calculato r-app/