scientific calculator with full options

What happens if you turn you iPhone into landscape mode? This is what I get on iOS 15

As MrHoffman says, you can try PCalc, and give Apple feedback, should iOS 16 not change to a scientific calculator when you rotate to landscape mode.

feras-k-ahmad wrote:

Dear Apple Support Team,

Can you please add a scientific calculator with full options to our iPhone iOS 16 the latest version?

We are not Apple, we are other users like you, and (where this was posted, in the developer forums) some are third-party app developers.

Log your feedback with Apple, as the folks that do work for Apple may or may not see suggestions posted here.

Here is how to provide: Product Feedback - Apple

PCalc is quite good.