As well as being able to do calculations in Spotlight, in Yosemite it gets an extra trick: unit conversions. You can do specific unit conversions if you need to – "13 stone in lbs", say – but it's also intelligent enough that in many cases if you just give it the amount and unit you want to convert, it will suggest not just the likely conversion but also plenty of alternates. Type in '$1299' and you'll immediately be told what that is in Sterling (based presumably on what's set as your native currency in the Language & Region pane of System Preferences), and then when the window folds down to show more results, you'll see Euros, Yen and so on.
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