If you type the word “calculator” or enter an equation into the Google search bar, a basic calculator will show up if you hold your smartphone in the upright “portrait” position.

How to Use the Secret Notes App Built Into Your iPhone's Calculator Work out equations and draw graphs with this useful new tool.

However, you can enhance the type of mathematical equations you're able to conduct by tilting your iPhone's Calculator sideways to access a scientific-calculator layout in landscape mode, allowing ...

But iOS 18 upgrades your Messages app so that it can solve tricky equations without your Calculator app, and it doesn't need Google to look up conversion rates, either.