Characters Per Line
Calculator
Results
- Characters per line
- 80
- Average character width (px)
- 8
- Width for a 66-character measure (px)
- 528
Design and print results
| Characters per line | 80 |
| Average character width (px) | 8 |
| Width for a 66-character measure (px) | 528 |
formula-map diagram
- Characters per line
- 80
- Average character width (px)
- 8
- Width for a 66-character measure (px)
- 528
Formula breakdown
Formula
CPL = column width ÷ (font size × average character width in em)= 80
Note
Simplified model: these are standard prepress and typographic relationships computed on nominal values. Real press bulk, paper caliper and shrinkage, ink limits for a given profile, font metrics and binding allowances vary by supplier and by job, so confirm with your printer and a proof before going to press.
More in Design and printing
See all →Frequently asked questions
How does this calculator estimate characters per line?+
It divides the available column width by the average character width for your font and size (character width is typically approximated as a fraction of the font size, often using the width of the lowercase alphabet divided by 26).
What's considered an ideal number of characters per line?+
Typography guidance generally recommends 45-75 characters per line for comfortable reading, with around 66 often cited as the sweet spot — long enough to feel efficient, short enough that the eye doesn't lose its place jumping back to the start of the next line.
Why does my text column feel hard to read even though the character count looks right?+
Line height interacts with line length — long lines need more line height to keep the eye on track, while lines that are appropriately short can use a tighter line height. If one is fixed and the other is off, readability suffers even at a 'correct' character count.
Does font choice affect the characters-per-line result?+
Yes, significantly — condensed fonts fit more characters in the same width than wide or heavily-spaced fonts, so the same column width and font size can yield very different characters-per-line depending on the typeface.
How do I fix a line that's calculated as too long?+
Narrow the column width, increase the font size (which increases average character width and reduces how many fit), or switch to a less condensed typeface — any of these reduces characters per line back toward the recommended range.