First measure the height of the page of the book (h mm) and the height of the smaller of the top and bottom margins for the text on the page (x mm). Cut a rectangular piece of firm card so that it has a length that is equal to h/2 + x. The width can be whatever you wish, say, about a third of the width of the book.
For example, for a standard paperback novel I find that h = 198 and x = 19. So we need the bookmark to be 99 + 19 = 118 mm long.
Then on one side of the card draw a double-headed arrow x mm from the top (i.e. 19 mm for our standard paperback). The diagram shows a bookmark made for this standard paperback.
With this system any starting point on either the even-numbered page (verso) or the odd-numbered page (recto) can be marked, without the bookmark sticking out of the closed book (which I don't like).
The diagrams below show the bookmark placed inside the book to mark (a) a point half-way down the left-hand page; and (b) a point near the bottom of the right-hand page.
(a)

(b)
Well, it works for me. And it is a good application of simple measurement and spatial reasoning!
thanks for sharing this information
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