OS X Mountain Lion: Get a quick calculation
To get a quick calculation, type a mathematical expression into the Spotlight search field.
- Click the Spotlight icon (looks like a magnifying glass) in the upper-right corner of your screen.
- Type a mathematical expression.
For example, if you type 956*23.94, the search results include the calculation 956*23.94 = 22886.64.
For a list of abbreviations you can type in the search field to perform calculations, open Calculator and choose Help > Calculator Help.