diff --git a/cmd-refresh-client.c b/cmd-refresh-client.c
index 49921a74..b4c5e844 100644
--- a/cmd-refresh-client.c
+++ b/cmd-refresh-client.c
@@ -130,7 +130,7 @@ cmd_refresh_client_exec(struct cmd *self, struct cmdq_item *item)
 				cmdq_error(item, "size too small or too big");
 				return (CMD_RETURN_ERROR);
 			}
-			tty_set_size(&c->tty, x, y);
+			tty_set_size(&c->tty, x, y, 0, 0);
 			c->flags |= CLIENT_SIZECHANGED;
 			recalculate_sizes();
 		}
diff --git a/format.c b/format.c
index ffa9b8d5..45320bf5 100644
--- a/format.c
+++ b/format.c
@@ -2158,6 +2158,8 @@ format_defaults_client(struct format_tree *ft, struct client *c)
 	format_add(ft, "client_pid", "%ld", (long) c->pid);
 	format_add(ft, "client_height", "%u", tty->sy);
 	format_add(ft, "client_width", "%u", tty->sx);
+	format_add(ft, "client_cell_width", "%u", tty->xpixel);
+	format_add(ft, "client_cell_height", "%u", tty->ypixel);
 	format_add(ft, "client_tty", "%s", c->ttyname);
 	format_add(ft, "client_control_mode", "%d",
 		!!(c->flags & CLIENT_CONTROL));
diff --git a/tmux.1 b/tmux.1
index 6cf8df24..fc42b393 100644
--- a/tmux.1
+++ b/tmux.1
@@ -4209,6 +4209,8 @@ The following variables are available, where appropriate:
 .It Li "buffer_sample" Ta "" Ta "Sample of start of buffer"
 .It Li "buffer_size" Ta "" Ta "Size of the specified buffer in bytes"
 .It Li "client_activity" Ta "" Ta "Time client last had activity"
+.It Li "client_cell_height" Ta "" Ta "Height of each client cell in pixels"
+.It Li "client_cell_width" Ta "" Ta "Width of each client cell in pixels"
 .It Li "client_control_mode" Ta "" Ta "1 if client is in control mode"
 .It Li "client_created" Ta "" Ta "Time client created"
 .It Li "client_discarded" Ta "" Ta "Bytes discarded when client behind"
@@ -4223,7 +4225,7 @@ The following variables are available, where appropriate:
 .It Li "client_termname" Ta "" Ta "Terminal name of client"
 .It Li "client_termtype" Ta "" Ta "Terminal type of client"
 .It Li "client_tty" Ta "" Ta "Pseudo terminal of client"
-.It Li "client_utf8" Ta "" Ta "1 if client supports utf8"
+.It Li "client_utf8" Ta "" Ta "1 if client supports UTF-8"
 .It Li "client_width" Ta "" Ta "Width of client"
 .It Li "client_written" Ta "" Ta "Bytes written to client"
 .It Li "command" Ta "" Ta "Name of command in use, if any"
diff --git a/tmux.h b/tmux.h
index 5b6a1716..d2a4196a 100644
--- a/tmux.h
+++ b/tmux.h
@@ -1148,6 +1148,8 @@ struct tty {
 
 	u_int		 sx;
 	u_int		 sy;
+	u_int		 xpixel;
+	u_int		 ypixel;
 
 	u_int		 cx;
 	u_int		 cy;
@@ -1927,7 +1929,7 @@ void	tty_putc(struct tty *, u_char);
 void	tty_putn(struct tty *, const void *, size_t, u_int);
 int	tty_init(struct tty *, struct client *, int, char *);
 void	tty_resize(struct tty *);
-void	tty_set_size(struct tty *, u_int, u_int);
+void	tty_set_size(struct tty *, u_int, u_int, u_int, u_int);
 void	tty_start_tty(struct tty *);
 void	tty_stop_tty(struct tty *);
 void	tty_set_title(struct tty *, const char *);
diff --git a/tty.c b/tty.c
index d77bb440..9efd78a0 100644
--- a/tty.c
+++ b/tty.c
@@ -127,29 +127,40 @@ tty_resize(struct tty *tty)
 {
 	struct client	*c = tty->client;
 	struct winsize	 ws;
-	u_int		 sx, sy;
+	u_int		 sx, sy, xpixel, ypixel;
 
 	if (ioctl(tty->fd, TIOCGWINSZ, &ws) != -1) {
 		sx = ws.ws_col;
-		if (sx == 0)
+		if (sx == 0) {
 			sx = 80;
+			xpixel = 0;
+		} else
+			xpixel = ws.ws_xpixel / sx;
 		sy = ws.ws_row;
-		if (sy == 0)
+		if (sy == 0) {
 			sy = 24;
+			ypixel = 0;
+		} else
+			ypixel = ws.ws_ypixel / sy;
 	} else {
 		sx = 80;
 		sy = 24;
+		xpixel = 0;
+		ypixel = 0;
 	}
-	log_debug("%s: %s now %ux%u", __func__, c->name, sx, sy);
-	tty_set_size(tty, sx, sy);
+	log_debug("%s: %s now %ux%u (%ux%u)", __func__, c->name, sx, sy,
+	    xpixel, ypixel);
+	tty_set_size(tty, sx, sy, xpixel, ypixel);
 	tty_invalidate(tty);
 }
 
 void
-tty_set_size(struct tty *tty, u_int sx, u_int sy)
+tty_set_size(struct tty *tty, u_int sx, u_int sy, u_int xpixel, u_int ypixel)
 {
 	tty->sx = sx;
 	tty->sy = sy;
+	tty->xpixel = xpixel;
+	tty->ypixel = ypixel;
 }
 
 static void