diff --git a/backend/libinput/events.c b/backend/libinput/events.c
index d92de830..da7b2be4 100644
--- a/backend/libinput/events.c
+++ b/backend/libinput/events.c
@@ -46,6 +46,8 @@ static struct wlr_input_device *allocate_device(
 		return NULL;
 	}
 	struct wlr_input_device *wlr_dev = &wlr_libinput_dev->wlr_input_device;
+	libinput_device_get_size(libinput_dev,
+			&wlr_dev->width_mm, &wlr_dev->height_mm);
 	wl_list_insert(wlr_devices, &wlr_dev->link);
 	wlr_libinput_dev->handle = libinput_dev;
 	libinput_device_ref(libinput_dev);
diff --git a/backend/libinput/tablet_tool.c b/backend/libinput/tablet_tool.c
index 27cf7c81..815c4daf 100644
--- a/backend/libinput/tablet_tool.c
+++ b/backend/libinput/tablet_tool.c
@@ -34,14 +34,13 @@ void handle_tablet_tool_axis(struct libinput_event *event,
 	wlr_event.device = wlr_dev;
 	wlr_event.time_msec =
 		usec_to_msec(libinput_event_tablet_tool_get_time_usec(tevent));
-	libinput_device_get_size(libinput_dev, &wlr_event.width_mm, &wlr_event.height_mm);
 	if (libinput_event_tablet_tool_x_has_changed(tevent)) {
 		wlr_event.updated_axes |= WLR_TABLET_TOOL_AXIS_X;
-		wlr_event.x_mm = libinput_event_tablet_tool_get_x(tevent);
+		wlr_event.x = libinput_event_tablet_tool_get_x_transformed(tevent, 1);
 	}
 	if (libinput_event_tablet_tool_y_has_changed(tevent)) {
 		wlr_event.updated_axes |= WLR_TABLET_TOOL_AXIS_Y;
-		wlr_event.y_mm = libinput_event_tablet_tool_get_y(tevent);
+		wlr_event.y = libinput_event_tablet_tool_get_y_transformed(tevent, 1);
 	}
 	if (libinput_event_tablet_tool_pressure_has_changed(tevent)) {
 		wlr_event.updated_axes |= WLR_TABLET_TOOL_AXIS_PRESSURE;
diff --git a/examples/pointer.c b/examples/pointer.c
index 2c598b9a..aaaad841 100644
--- a/examples/pointer.c
+++ b/examples/pointer.c
@@ -251,8 +251,8 @@ static void handle_tablet_tool_axis(struct wl_listener *listener, void *data) {
 	struct wlr_event_tablet_tool_axis *event = data;
 	if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_X) &&
 			(event->updated_axes & WLR_TABLET_TOOL_AXIS_Y)) {
-		wlr_cursor_warp_absolute(sample->cursor, event->device,
-				event->x_mm / event->width_mm, event->y_mm / event->height_mm);
+		wlr_cursor_warp_absolute(sample->cursor,
+				event->device, event->x, event->y);
 	}
 }
 
diff --git a/examples/tablet.c b/examples/tablet.c
index 9379fac3..be428f86 100644
--- a/examples/tablet.c
+++ b/examples/tablet.c
@@ -28,7 +28,7 @@ struct sample_state {
 	bool proximity, tap, button;
 	double distance;
 	double pressure;
-	double x_mm, y_mm;
+	double x, y;
 	double x_tilt, y_tilt;
 	double width_mm, height_mm;
 	double ring;
@@ -69,8 +69,8 @@ static void handle_output_frame(struct output_state *output, struct timespec *ts
 
 	if (sample->proximity) {
 		struct wlr_box box = {
-			.x = sample->x_mm * scale - 8 * (sample->pressure + 1) + left,
-			.y = sample->y_mm * scale - 8 * (sample->pressure + 1) + top,
+			.x = (sample->x * pad_width) - 8 * (sample->pressure + 1) + left,
+			.y = (sample->y * pad_height) - 8 * (sample->pressure + 1) + top,
 			.width = 16 * (sample->pressure + 1),
 			.height = 16 * (sample->pressure + 1),
 		};
@@ -94,13 +94,11 @@ static void handle_output_frame(struct output_state *output, struct timespec *ts
 static void handle_tool_axis(struct tablet_tool_state *tstate,
 			struct wlr_event_tablet_tool_axis *event) {
 	struct sample_state *sample = tstate->compositor->data;
-	sample->width_mm = event->width_mm;
-	sample->height_mm = event->height_mm;
 	if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_X)) {
-		sample->x_mm = event->x_mm;
+		sample->x = event->x;
 	}
 	if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_Y)) {
-		sample->y_mm = event->y_mm;
+		sample->y = event->y;
 	}
 	if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_DISTANCE)) {
 		sample->distance = event->distance;
@@ -164,13 +162,24 @@ static void handle_pad_ring(struct tablet_pad_state *pstate,
 	}
 }
 
+static void handle_input_add(struct compositor_state *cstate,
+		struct wlr_input_device *inputdev) {
+	struct sample_state *sample = cstate->data;
+	if (inputdev->type == WLR_INPUT_DEVICE_TABLET_TOOL) {
+		sample->width_mm = inputdev->width_mm == 0 ?
+			20 : inputdev->width_mm;
+		sample->height_mm = inputdev->height_mm == 0 ?
+			10 : inputdev->height_mm;
+	}
+}
+
 int main(int argc, char *argv[]) {
 	wlr_log_init(L_DEBUG, NULL);
 	struct sample_state state = {
 		.tool_color = { 1, 1, 1, 1 },
 		.pad_color = { 0.5, 0.5, 0.5, 1.0 }
 	};
-	struct compositor_state compositor = { 0,
+	struct compositor_state compositor = {
 		.data = &state,
 		.output_frame_cb = handle_output_frame,
 		.tool_axis_cb = handle_tool_axis,
@@ -178,6 +187,8 @@ int main(int argc, char *argv[]) {
 		.tool_button_cb = handle_tool_button,
 		.pad_button_cb = handle_pad_button,
 		.pad_ring_cb = handle_pad_ring,
+		.input_add_cb = handle_input_add,
+		0
 	};
 	compositor_init(&compositor);
 
diff --git a/include/wlr/types/wlr_input_device.h b/include/wlr/types/wlr_input_device.h
index 6d8e3631..d65172c1 100644
--- a/include/wlr/types/wlr_input_device.h
+++ b/include/wlr/types/wlr_input_device.h
@@ -29,6 +29,8 @@ struct wlr_input_device {
 	enum wlr_input_device_type type;
 	int vendor, product;
 	char *name;
+	// Or 0 if not applicable to this device
+	double width_mm, height_mm;
 
 	/* wlr_input_device.type determines which of these is valid */
 	union {
diff --git a/include/wlr/types/wlr_tablet_tool.h b/include/wlr/types/wlr_tablet_tool.h
index 59e49ef8..22bf2649 100644
--- a/include/wlr/types/wlr_tablet_tool.h
+++ b/include/wlr/types/wlr_tablet_tool.h
@@ -36,8 +36,8 @@ struct wlr_event_tablet_tool_axis {
 	struct wlr_input_device *device;
 	uint32_t time_msec;
 	uint32_t updated_axes;
-	double x_mm, y_mm;
-	double width_mm, height_mm;
+	// From 0..1
+	double x, y;
 	double pressure;
 	double distance;
 	double tilt_x, tilt_y;
@@ -54,8 +54,8 @@ enum wlr_tablet_tool_proximity_state {
 struct wlr_event_tablet_tool_proximity {
 	struct wlr_input_device *device;
 	uint32_t time_msec;
-	double x_mm, y_mm;
-	double width_mm, height_mm;
+	// From 0..1
+	double x, y;
 	enum wlr_tablet_tool_proximity_state state;
 };
 
@@ -67,8 +67,8 @@ enum wlr_tablet_tool_tip_state {
 struct wlr_event_tablet_tool_tip {
 	struct wlr_input_device *device;
 	uint32_t time_msec;
-	double x_mm, y_mm;
-	double width_mm, height_mm;
+	// From 0..1
+	double x, y;
 	enum wlr_tablet_tool_tip_state state;
 };
 
diff --git a/rootston/cursor.c b/rootston/cursor.c
index 786dff0e..a5953e4a 100644
--- a/rootston/cursor.c
+++ b/rootston/cursor.c
@@ -392,15 +392,13 @@ void roots_cursor_handle_tool_axis(struct roots_cursor *cursor,
 	if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_X) &&
 			(event->updated_axes & WLR_TABLET_TOOL_AXIS_Y)) {
 		wlr_cursor_warp_absolute(cursor->cursor, event->device,
-			event->x_mm / event->width_mm, event->y_mm / event->height_mm);
+			event->x, event->y);
 		roots_cursor_update_position(cursor, event->time_msec);
 	} else if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_X)) {
-		wlr_cursor_warp_absolute(cursor->cursor, event->device,
-			event->x_mm / event->width_mm, -1);
+		wlr_cursor_warp_absolute(cursor->cursor, event->device, event->x, -1);
 		roots_cursor_update_position(cursor, event->time_msec);
 	} else if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_Y)) {
-		wlr_cursor_warp_absolute(cursor->cursor, event->device,
-			-1, event->y_mm / event->height_mm);
+		wlr_cursor_warp_absolute(cursor->cursor, event->device, -1, event->y);
 		roots_cursor_update_position(cursor, event->time_msec);
 	}
 }