Book & Print Tools › Trim size converter
Trim size converter: page count for a new book size
Changing the trim size changes the area of every page, so the same text runs to a different number of pages. Going from 6 × 9 to 5 × 8 gives you more pages; going the other way gives you fewer.
Enter your current page count, the size you have now and the size you want. The tool estimates how many words fit on a page of each size using the same margins and line spacing, then scales your page count by the ratio.
The result assumes the font size stays the same and the content is mostly text. Images and tables do not scale in the same way, so treat the answer as a planning figure. Typeset again at the new size for the real number, and recalculate the spine width because it depends on the page count.
How to use it
- Enter the page count of the current layout.
- Choose the current and the new trim size.
- Typeset at the new size and check the real page count.
Worked example
A 200 page book at 6 × 9 in becomes about 294 pages at 5 × 8 in.
Sources and figures
- Layout assumptions are listed in figures.json under 'layout'.
Questions
- Why do smaller books have more pages?
- Each page holds fewer words, so the text needs more of them.
- Does font size matter?
- Yes. Keep the same font size for a fair comparison, or run the estimate again with the new size.
- Is the result exact?
- No. It is an estimate based on text area.
- What should I do after converting?
- Recalculate the spine width and the cover size with the new page count.
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