Brian M. Curran wrote:

> I'm styling my website, and noticed that at my given text size that
> the line lengths are too long, because they hurt my eyes. Is there a
> rule of thumb for number of characters per line that will yield the
> best readability?

There are lots of rules of thumbs... just pick up your authority, and you 
get some rule, often rather different from other authorities' rules. Good 
authorities will also say "it really depends" and describe parameters like 
font face and size, line height, length of words, lack or presence of 
hyphenation, ragged right vs. justified column, and the overall design of 
the page (e.g., how many columns) that should be considered. But don't get 
desperate.

On web pages, lines tend to be too short if the author has considered the 
issue of line length, and much too long in most situations if the hasn't. So 
just using something fairly sensible, like setting max-width somewhere 
between 25em and 50em and either not setting width and min-width at all 
setting them at least to 20em is likely to make your pages better than most 
pages in this respect.

You later mentioned that the site is
http://www.draftingservices.com
Although the width of the left column is relatively small, it might still be 
somewhat too large for a couple of reasons. With ragged right and with 
another column on the right, with little gutter between the columns, the 
impression is somewhat messy. Adding 1em...2em right padding to the left 
column would probably help in making the columns appear better. Testing the 
effects of such padding would be easy (especially using nice tools like 
on-the-fly editing of CSS with Firefox Web Developer extension), except for 
the issue that the overall page layout is not based on pixel widths that 
need to match each other.

The page uses basically Arial (i.e. the great majority of visitors will see 
it in Arial), which has a large x-height and therefore has increasing 
problems as line length is increased - it becomes more and more difficult to 
the eye to follow the lines. You have made the precaution of setting 
line-height to 1.4. Without it, the appearance would be rather poor. At 
present, the width is at the limits of being too large for comfortable 
reading.

-- 
Yucca, http://www.cs.tut.fi/~jkorpela/ 

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