This is also far from the first (or even broadest) utility of this type from Google.

See also:

https://www.google.com/#q=calculator

https://www.google.com/#q=time%20in%20new%20york

https://www.google.com/#q=50%20miles%20to%20km

https://www.google.com/#q=1%20usd%20to%20rmb

https://www.google.com/#q=barack%20obama

https://www.google.com/#q=weather%20in%20sf