How to Determine Text Height
Text height, or font size, is most often measured in pixels (px), points (pt) or ems (em). "Em", unlike "px" and "pt," is scalable; "em" bases its font size off of the font size of the parent document. For example, if the text height of the page is 12 points, then 1 em is equal to 12 points, 2 em is equal 24 points, and so on. In general, 1 em is equal to 12 points, which is equal to 16 pixels. Unlike ems, pixels and points are not scalable; one point is equal to 1/72 of an inch and one pixel is equal to a single point on the screen. You can check the coding of a Web page to determine website's text height.
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Instructions
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Right-click the page. Select "View Source" or "View Page Source" from the context menu.
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Press "Ctrl" and "F" to open "Find." Type "font-size" into the search box.
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Press "Enter" to search the page code. Check the value next to the "font-size" attribute to determine the text height. Note that most Web designers use different font sizes throughout the page.
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Tips & Warnings
Percentages are also sometimes used with the "font-size" attribute. Percentages work similar to ems; "100%" is generally equal to 12 points.
