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Asked: 2026-05-15T04:02:02+00:00

I have a LOGFONT structure. Now all i’d like to do is get the

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I have a LOGFONT structure. Now all i’d like to do is get the associated font size in points from the LOGFONT height.

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  1. Editorial Team

    When the mapping mode is mm_Text (which it usually is), and when the lfHeight field is positive, it already gives the height in points. When it’s negative, the units are pixels. MSDN for LogFont gives you the formula to convert between them:

    lfHeight = -MulDiv(PointSize, GetDeviceCaps(hDC, LOGPIXELSY), 72);

    There are 72 points per inch. GetDeviceCaps tells you the number of pixels per inch on a given device. Invert the formula to get pixels from points:

    PointSize := MulDiv(-lfHeight, 72, GetDeviceCaps(hDC, LogPixelsY);

    The important thing to realize here is that you need a device context. Font sizes don’t exist independently of the media they appear on. The pixel height of a font on the screen will be different from the pixel height of a font on a printer. Use the Handle property of whatever canvas you’re planning on drawing to.

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