Know how wide text will be on a Canvas

Hey guys, 

I was wondering if there was a way I can set the font in a canvas:

m_context.setFont("bold 12px sans-serif");

Then take some text, like Hello World! and know how many pixels wide that will be? I have a set space on my canvas, and I want to maximize the size of the text or justify it correctly. So if I know Hello World will take 50 pixels in the X-direction, but I have 75 pixels, I can start it at x+(75-50)/2.0 pixels and have it centered. 

Thanks!

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