>>A font is a font. But there's no guarantee that the font you specify exists on the browser. It will use the best match it has.
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>We use a standard font. And, having a font similar to the one we need would do.
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>>And a pixel is a pixel - but counting the pixels for a specific font size on the server doesn't take into account the resolution on the browser.
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>This is styled into the page. So, the obtained value should be pretty close to what we need.
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>>I think the best chance of getting it right is to do the calculation on the browser. That said, I might be wrong about this - it's a pretty confusing subject (at least for me :-} )
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>At first, I would like to try it from Windows. Do you know of any class I could use at the .NET level to benefit of such a need?

Maybe the static TextRenderer.MeasureText(....) method ?