diff --git a/cmd-display-menu.c b/cmd-display-menu.c
index 205d1243..7115dc81 100644
--- a/cmd-display-menu.c
+++ b/cmd-display-menu.c
@@ -61,7 +61,7 @@ const struct cmd_entry cmd_display_popup_entry = {
 	.exec = cmd_display_popup_exec
 };
 
-static void
+static int
 cmd_display_menu_get_position(struct client *tc, struct cmdq_item *item,
     struct args *args, u_int *px, u_int *py, u_int w, u_int h)
 {
@@ -71,44 +71,46 @@ cmd_display_menu_get_position(struct client *tc, struct cmdq_item *item,
 	struct session		*s = tc->session;
 	struct winlink		*wl = target->wl;
 	struct window_pane	*wp = target->wp;
-	struct style_ranges	*ranges;
-	struct style_range	*sr;
+	struct style_ranges	*ranges = NULL;
+	struct style_range	*sr = NULL;
 	const char		*xp, *yp;
-	u_int			 line, ox, oy, sx, sy, lines;
+	char			*p;
+	int			 top;
+	u_int			 line, ox, oy, sx, sy, lines, position;
+	long			 n;
+	struct format_tree	*ft;
 
-	lines = status_line_size(tc);
-	for (line = 0; line < lines; line++) {
-		ranges = &tc->status.entries[line].ranges;
-		TAILQ_FOREACH(sr, ranges, entry) {
-			if (sr->type == STYLE_RANGE_WINDOW)
-				break;
-		}
-		if (sr != NULL)
-			break;
+	/*
+	 * Work out the position from the -x and -y arguments. This is the
+	 * bottom-left position.
+	 */
+
+	/* If the popup is too big, stop now. */
+	if (w > tty->sx || h > tty->sy)
+		return (0);
+
+	/* Create format with mouse position if any. */
+	ft = format_create_from_target(item);
+	if (event->m.valid) {
+		format_add(ft, "popup_mouse_x", "%u", event->m.x);
+		format_add(ft, "popup_mouse_y", "%u", event->m.y);
 	}
-	if (line == lines)
-		ranges = &tc->status.entries[0].ranges;
 
-	xp = args_get(args, 'x');
-	if (xp == NULL || strcmp(xp, "C") == 0)
-		*px = (tty->sx - 1) / 2 - w / 2;
-	else if (strcmp(xp, "R") == 0)
-		*px = tty->sx - 1;
-	else if (strcmp(xp, "P") == 0) {
-		tty_window_offset(&tc->tty, &ox, &oy, &sx, &sy);
-		if (wp->xoff >= ox)
-			*px = wp->xoff - ox;
+	/*
+	 * If there are any status lines, add this window position and the
+	 * status line position.
+	 */
+	top = status_at_line(tc);
+	if (top != -1) {
+		lines = status_line_size(tc);
+		if (top == 0)
+			top = lines;
 		else
-			*px = 0;
-	} else if (strcmp(xp, "M") == 0) {
-		if (event->m.valid && event->m.x > w / 2)
-			*px = event->m.x - w / 2;
-		else
-			*px = 0;
-	} else if (strcmp(xp, "W") == 0) {
-		if (status_at_line(tc) == -1)
-			*px = 0;
-		else {
+			top = 0;
+		position = options_get_number(s->options, "status-position");
+
+		for (line = 0; line < lines; line++) {
+			ranges = &tc->status.entries[line].ranges;
 			TAILQ_FOREACH(sr, ranges, entry) {
 				if (sr->type != STYLE_RANGE_WINDOW)
 					continue;
@@ -116,61 +118,137 @@ cmd_display_menu_get_position(struct client *tc, struct cmdq_item *item,
 					break;
 			}
 			if (sr != NULL)
-				*px = sr->start;
-			else
-				*px = 0;
+				break;
+		}
+		if (line == lines)
+			ranges = &tc->status.entries[0].ranges;
+
+		if (sr != NULL) {
+			format_add(ft, "popup_window_status_line_x", "%u",
+			    sr->start);
+			if (position == 0) {
+				format_add(ft, "popup_window_status_line_y",
+				    "%u", line + 1 + h);
+			} else {
+				format_add(ft, "popup_window_status_line_y",
+				    "%u", tty->sy - lines + line);
+			}
+		}
+
+		if (position == 0)
+			format_add(ft, "popup_status_line_y", "%u", lines + h);
+		else {
+			format_add(ft, "popup_status_line_y", "%u",
+			    tty->sy - lines);
 		}
 	} else
-		*px = strtoul(xp, NULL, 10);
-	if ((*px) + w >= tty->sx)
-		*px = tty->sx - w;
+		top = 0;
 
+	/* Popup width and height. */
+	format_add(ft, "popup_width", "%u", w);
+	format_add(ft, "popup_height", "%u", h);
+
+	/* Position so popup is in the centre. */
+	n = (long)(tty->sx - 1) / 2 - w / 2;
+	if (n < 0)
+		format_add(ft, "popup_centre_x", "%u", 0);
+	else
+		format_add(ft, "popup_centre_x", "%ld", n);
+	n = (tty->sy - 1) / 2 + h / 2;
+	if (n + h >= tty->sy)
+		format_add(ft, "popup_centre_y", "%u", tty->sy - h);
+	else
+		format_add(ft, "popup_centre_y", "%ld", n);
+
+	/* Position of popup relative to mouse. */
+	if (event->m.valid) {
+		n = (long)event->m.x - w / 2;
+		if (n < 0)
+			format_add(ft, "popup_mouse_centre_x", "%u", 0);
+		else
+			format_add(ft, "popup_mouse_centre_x", "%ld", n);
+		n = event->m.y - h / 2;
+		if (n + h >= tty->sy) {
+			format_add(ft, "popup_mouse_centre_y", "%u",
+			    tty->sy - h);
+		} else
+			format_add(ft, "popup_mouse_centre_y", "%ld", n);
+		n = (long)event->m.y + h;
+		if (n + h >= tty->sy)
+			format_add(ft, "popup_mouse_top", "%u", tty->sy - h);
+		else
+			format_add(ft, "popup_mouse_top", "%ld", n);
+		n = event->m.y - h;
+		if (n < 0)
+			format_add(ft, "popup_mouse_bottom", "%u", 0);
+		else
+			format_add(ft, "popup_mouse_bottom", "%ld", n);
+	}
+
+	/* Position in pane. */
+	tty_window_offset(&tc->tty, &ox, &oy, &sx, &sy);
+	n = top + wp->yoff - oy + h;
+	if (n >= tty->sy)
+		format_add(ft, "popup_pane_top", "%u", tty->sy - h);
+	else
+		format_add(ft, "popup_pane_top", "%ld", n);
+	format_add(ft, "popup_pane_bottom", "%u", top + wp->yoff + wp->sy - oy);
+	format_add(ft, "popup_pane_left", "%u", wp->xoff - ox);
+	n = (long)wp->xoff + wp->sx - ox - w;
+	if (n < 0)
+		format_add(ft, "popup_pane_right", "%u", 0);
+	else
+		format_add(ft, "popup_pane_right", "%ld", n);
+
+	/* Expand horizontal position. */
+	xp = args_get(args, 'x');
+	if (xp == NULL || strcmp(xp, "C") == 0)
+		xp = "#{popup_centre_x}";
+	else if (strcmp(xp, "R") == 0)
+		xp = "#{popup_right}";
+	else if (strcmp(xp, "P") == 0)
+		xp = "#{popup_pane_left}";
+	else if (strcmp(xp, "M") == 0)
+		xp = "#{popup_mouse_centre_x}";
+	else if (strcmp(xp, "W") == 0)
+		xp = "#{popup_window_status_line_x}";
+	p = format_expand(ft, xp);
+	n = strtol(p, NULL, 10);
+	if (n + w >= tty->sx)
+		n = tty->sx - w;
+	else if (n < 0)
+		n = 0;
+	*px = n;
+	log_debug("%s: -x: %s = %s = %u", __func__, xp, p, *px);
+	free(p);
+
+	/* Expand vertical position  */
 	yp = args_get(args, 'y');
 	if (yp == NULL || strcmp(yp, "C") == 0)
-		*py = (tty->sy - 1) / 2 + h / 2;
-	else if (strcmp(yp, "P") == 0) {
-		tty_window_offset(&tc->tty, &ox, &oy, &sx, &sy);
-		if (wp->yoff + wp->sy >= oy)
-			*py = wp->yoff + wp->sy - oy;
-		else
-			*py = 0;
-	} else if (strcmp(yp, "M") == 0) {
-		if (event->m.valid)
-			*py = event->m.y + h;
-		else
-			*py = 0;
-	} else if (strcmp(yp, "S") == 0) {
-		if (options_get_number(s->options, "status-position") == 0) {
-			if (lines != 0)
-				*py = lines + h;
-			else
-				*py = 0;
-		} else {
-			if (lines != 0)
-				*py = tty->sy - lines;
-			else
-				*py = tty->sy;
-		}
-	} else if (strcmp(yp, "W") == 0) {
-		if (options_get_number(s->options, "status-position") == 0) {
-			if (lines != 0)
-				*py = line + 1 + h;
-			else
-				*py = 0;
-		} else {
-			if (lines != 0)
-				*py = tty->sy - lines + line;
-			else
-				*py = tty->sy;
-		}
-	} else
-		*py = strtoul(yp, NULL, 10);
-	if (*py < h)
-		*py = 0;
+		yp = "#{popup_centre_y}";
+	else if (strcmp(yp, "P") == 0)
+		yp = "#{popup_pane_bottom}";
+	else if (strcmp(yp, "M") == 0)
+		yp = "#{popup_mouse_top}";
+	else if (strcmp(yp, "S") == 0)
+		yp = "#{popup_status_line_y}";
+	else if (strcmp(yp, "W") == 0)
+		yp = "#{popup_window_status_line_y}";
+	p = format_expand(ft, yp);
+	n = strtol(p, NULL, 10);
+	if (n < h)
+		n = 0;
 	else
-		*py -= h;
-	if ((*py) + h >= tty->sy)
-		*py = tty->sy - h;
+		n -= h;
+	if (n + h >= tty->sy)
+		n = tty->sy - h;
+	else if (n < 0)
+		n = 0;
+	*py = n;
+	log_debug("%s: -y: %s = %s = %u", __func__, yp, p, *py);
+	free(p);
+
+	return (1);
 }
 
 static enum cmd_retval
@@ -226,8 +304,11 @@ cmd_display_menu_exec(struct cmd *self, struct cmdq_item *item)
 		menu_free(menu);
 		return (CMD_RETURN_NORMAL);
 	}
-	cmd_display_menu_get_position(tc, item, args, &px, &py, menu->width + 4,
-	    menu->count + 2);
+	if (!cmd_display_menu_get_position(tc, item, args, &px, &py,
+	    menu->width + 4, menu->count + 2)) {
+		menu_free(menu);
+		return (CMD_RETURN_NORMAL);
+	}
 
 	if (args_has(args, 'O'))
 		flags |= MENU_STAYOPEN;
@@ -296,7 +377,8 @@ cmd_display_popup_exec(struct cmd *self, struct cmdq_item *item)
 		w = tty->sx - 1;
 	if (h > tty->sy - 1)
 		h = tty->sy - 1;
-	cmd_display_menu_get_position(tc, item, args, &px, &py, w, h);
+	if (!cmd_display_menu_get_position(tc, item, args, &px, &py, w, h))
+		return (CMD_RETURN_NORMAL);
 
 	value = args_get(args, 'd');
 	if (value != NULL)
diff --git a/tmux.1 b/tmux.1
index 3d58b32f..0a71cc37 100644
--- a/tmux.1
+++ b/tmux.1
@@ -5388,6 +5388,28 @@ Both may be a row or column number, or one of the following special values:
 .It Li "S" Ta Fl y Ta "The line above or below the status line"
 .El
 .Pp
+Or a format, which is expanded including the following additional variables:
+.Bl -column "XXXXXXXXXXXXXXXXXXXXXXXXXX" -offset indent
+.It Sy "Variable name" Ta Sy "Replaced with"
+.It Li "popup_centre_x" Ta "Centered in the client"
+.It Li "popup_centre_y" Ta "Centered in the client"
+.It Li "popup_height" Ta "Height of menu or popup"
+.It Li "popup_mouse_bottom" Ta "Bottom of at the mouse"
+.It Li "popup_mouse_centre_x" Ta "Horizontal centre at the mouse"
+.It Li "popup_mouse_centre_y" Ta "Vertical centre at the mouse"
+.It Li "popup_mouse_top" Ta "Top at the mouse"
+.It Li "popup_mouse_x" Ta "Mouse X position"
+.It Li "popup_mouse_y" Ta "Mouse Y position"
+.It Li "popup_pane_bottom" Ta "Bottom of the pane"
+.It Li "popup_pane_left" Ta "Left of the pane"
+.It Li "popup_pane_right" Ta "Right of the pane"
+.It Li "popup_pane_top" Ta "Top of the pane"
+.It Li "popup_status_line_y" Ta "Above or below the status line"
+.It Li "popup_width" Ta "Width of menu or popup"
+.It Li "popup_window_status_line_x" Ta "At the window position in status line"
+.It Li "popup_window_status_line_y" Ta "At the status line showing the window"
+.El
+.Pp
 Each menu consists of items followed by a key shortcut shown in brackets.
 If the menu is too large to fit on the terminal, it is not displayed.
 Pressing the key shortcut chooses the corresponding item.