Usually, size 4 is 17pt and size 5 is 19pt.
18pt is the perfect size for me but it's impossible to get it with the Kindle settings.
That is why I convert every file I get :
1. Edit the azw3 file with Calibre.
2. Open the file with style definitions: either 0001.css or 0002.css
3. Identify the "main" style. Often its name is "calibre". To identify the main style, open any file named part000x.html, you'll see a line like: <body class="calibre">. It means that the main style is "calibre".
4. Add 6% to the font-size. I suggest you choose 1.45 for the the line-height.
Typically, my definition is:
.calibre {
display: block;
font-size: 1.06em;
line-height: 1.45;
padding-left: 0;
padding-right: 0;
margin: 0 5pt
}
5. Close, save, and load the file to your Kindle.
In your Kindle, in the font settings, choose Size 4 and the tightest line spacing. You'll get 22 lines per page.
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