How do I access scientific calculator option in the Calculator app?

sirram (author)

Perhaps through the iPhone User Guide (Table of Contents)

effects of applications will be revealed; & details featured too.

Calculator (iOS 18.0) iPhone

• Use the basic calculator
• Use the scientific calculator
• Solve math with Math Notes
• Work with graphs in Math Notes
• Convert units or currency
• See previous calculations

To view and try these settings in your iPhone see instructions:

Use the scientific calculator on iPhone - Apple Support

//support.apple.com/guide/iphone/use-the-scientific-calculator-iphb977c4c0e/18.0/ios/18.0

[Other aspects of iPhone iOS (in current models) are covered.]

PS:

Should those not exactly cure anything, have you tried

to 'Turn-Off/Turn-On' the iPhone; to see if that effects

change in how this System app presents itself?

Turn iPhone on or off - Apple Support

"Use the side button to turn on iPhone. You can use the side button (along with either volume button on some models) or Settings to turn off iPhone.

•If your iPhone isn’t working as expected, you can try restarting it by

turning it off, then turning it back on. If turning it off and on

doesn’t fix the issue, try forcing it to restart."

This default works, from menu settings:

All models: Go to Settings  > General > Shut Down, then drag the slider.

Turn on iPhone

Press and hold the side button until the Apple logo appears.

Turn off iPhone

• iPhone with Face ID:

"Simultaneously press and hold the side button and either volume button until the sliders appear, then drag the Power Off slider.

• iPhone with the Home button: Press and hold the side button, then drag the slider."

Since these ideas may/not have other official remedies,

a good faith suggestion to ask Apple Support directly.

Also you may file a Feedback Report an issue to Apple.

Feedback - iPhone - Apple (forms help direct thoughts)