Apple's Calculator app has undergone a significant redesign, transforming it from a basic calculator into a powerful tool with integrated scientific functions, unit conversion, and calculation history. This enhanced calculator is part of the iOS 18 (released Sept. 16th) and macOS Sequoia 15 updates, and—for the first time—is available on iPadOS 18, surpassing previous alternatives like Spotlight Search and Siri.

The updated app boasts a new "Math Notes" feature, seamlessly integrating with the Notes app. While previous iOS/iPadOS versions offered unit conversions by underlining values in apps like Notes and Messages (a method still available), the Calculator's new conversion feature is far more comprehensive. macOS Sonoma 14 and earlier versions included unit conversion via the menu bar, but macOS 15 offers improved functionality.

Key Features & How-To Guide:

1. Accessing the Conversion Calculator:

• iOS/iPadOS: Tap the calculator icon (bottom left), then enable the "Convert" toggle.
• macOS: Click the calculator button and select "Convert," choose "View" > "Convert" from the menu bar, or use Option-Command-C.

2. Modifying Input/Result Units:

The calculator defaults to USD to EUR conversion. Select either unit abbreviation (white font for input, gray for result) to change units. Results update dynamically.

3. Reviewing Calculation History:

History is saved upon pressing "=".

• iOS: Tap the List button.
• iPadOS: Tap the Sidebar button.
• macOS: Go to View > Show History or use Control-Command-S.

Edit or delete individual entries (iOS/iPadOS: "Edit" or long-press; iPadOS: swipe left; macOS: trash can icon). iOS 18.1 uses a bottom-up half-window for history, with a "Clear" button to delete all entries.

4. Swapping Input and Units:

Use the Swap Units button (two opposing arrows) to quickly switch input and output values.

5. Performing Math Calculations:

Perform basic and scientific calculations within the conversion mode. (iOS/iPadOS: tap calculator icon > "Scientific"; macOS: click calculator button > "Scientific", View > Scientific, or Command-2). Note: Unit conversion isn't compatible with Programmer mode on macOS.

6. Complete List of Compatible Units: (A comprehensive list of all 215 convertible units—104 currencies and 110 measurement units—is provided in the original article).

7. Unit Conversion in Math Notes:

Convert units directly within Math Notes (iOS/iPadOS/macOS). Use keywords like "as," "in," "into," and "to."

This enhanced Calculator app significantly improves workflow for users needing quick conversions and complex calculations.

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