How tall is 120cm?

google is your friend. Type '120mm in inches' into google and see what you get. Here's one I made earlier:

google.com/search?q=120mm+in+inches&ie=UTF-8&oe=UTF-8">http://www.google.com/search?q=120mm+in+inches&ie=UTF-8&oe=UTF-8

Direct Conversion Formula 120 mm*

1 in

25.4 mm

=

4.724409449 in