Which preposition should be used when I want to say a value in a different measure unit? For example, what is a correct preposition in the following sentence?

Twelve miles? I have no idea how far that is. What is it __ kilometres?


It depends a bit on the verb. Often you use "in"

What is 12 miles in kilometres?

(answer: about 19 km)

But with "change" you say "Please change 12 miles to kilometres" or "into kilometres".

  • 1
    I would never use to but into works. – Paul Childs Aug 14 '18 at 10:07
  • @Paul Childs: to and into are both used by many tens of millions of native speakers in that kind of construction. Both work. – Tᴚoɯɐuo Aug 14 '18 at 12:52

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