window-total-height

window-total-height is a built-in function in `C source code'.

(window-total-height &optional WINDOW ROUND)

Return the height of window WINDOW in lines.
WINDOW must be a valid window and defaults to the selected one.

The return value includes the heights of WINDOW's mode and header line
and its bottom divider, if any. If WINDOW is an internal window, the
total height is the height of the screen areas spanned by its children.

If WINDOW's pixel height is not an integral multiple of its frame's
character height, the number of lines occupied by WINDOW is rounded
internally. This is done in a way such that, if WINDOW is a parent
window, the sum of the total heights of all its children internally
equals the total height of WINDOW.

If the optional argument ROUND is `ceiling', return the smallest integer
larger than WINDOW's pixel height divided by the character height of
WINDOW's frame. ROUND `floor' means to return the largest integer
smaller than WINDOW's pixel height divided by the character height of
WINDOW's frame. Any other value of ROUND means to return the internal
total height of WINDOW.