binary vs. decimal

I am trying to figure out the decimal equivalent of 11011 and I got 16, is that right? And I'm also tryin to get the binary equivalent of 39 and I got 0011, is that also correct?
No, 1011 is 27 and 39 is 100111.

Use this to check http://acc6.its.brooklyn.cuny.edu/~gurwitz/core5/nav2tool.html

Wikipedia has some ways you can convert them with "successive multiplication" or something like that.
You can also read this: http://www.cplusplus.com/doc/hex/
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