I’ve noticed that best-selling novels tend to favor readability above all else. The most common font size for print novels is 11 or 12pt, with serif fonts like 'Garamond' or 'Times New Roman' being the go-to choices for traditional publishers. These fonts strike a balance between elegance and legibility, especially in long-form reading.
For mass-market paperbacks, you’ll often see slightly smaller fonts (10-11pt) to save space, while hardcovers and literary fiction might lean toward 12-13pt for a more luxurious feel. YA and genre fiction sometimes use bolder or slightly larger fonts (12pt) to feel more dynamic. Ebooks, on the other hand, often default to reflowable text, but the underlying design usually mimics print standards. The key is consistency—readers barely notice the font unless it’s poorly chosen.