21, 24, 36, 48, 60, 72) or the Fibonacci sequence (e.g. 16 – 24 – 40 – 64 –
104) to get natural typographic results.
6. Optimal Line Height For Body Copy
Leading (or line height) will always depend on your chosen font size and
measure (or line length). Generally, the longer the measure, the longer the
leading should be. Therefore, presenting a chart of the most popular
choices for leading in pixels wouldn՚t make sense here.
Relative units are often more appropriate
More appropriate would be for you to use a relative unit, such as an em or
percentage value, that determines the relation between leading and
measure and between leading and font size.
According to our study:
line height (pixels) ÷ body copy font size (pixels) = 1.48
Note that 1.5 is a value that is commonly recommended in classic
typographic books, so our study backs up this rule of thumb. Very few Web
sites use anything less than that. The number of Web sites that go above
1.48 decreases as you get further from this value.
line length (pixels) ÷ line height (pixels) = 27.8
The average line length is 538.64 pixels (excluding margins and paddings)
which is pretty large, considering that many Web sites still use 12 to 13
pixels for their body copy font size.
space between paragraphs (pixels) ÷ line height (pixels) = 0.754