diff --git a/server/src/wled_controller/core/capture/screen_overlay.py b/server/src/wled_controller/core/capture/screen_overlay.py
index a36f79f..989ef56 100644
--- a/server/src/wled_controller/core/capture/screen_overlay.py
+++ b/server/src/wled_controller/core/capture/screen_overlay.py
@@ -142,7 +142,9 @@ class OverlayWindow:
                 for i in range(count):
                     display_idx = (led_index + self.calibration.offset) % total_leds
                     if i == 0 or i == count - 1 or display_idx % tick_interval == 0:
-                        frac = i / count if count > 1 else 0.5
+                        frac = i / (count - 1) if count > 1 else 0.5
+                        if seg.reverse:
+                            frac = 1.0 - frac
                         x = start_px + frac * (end_px - start_px)
                         tick_len = 15 if display_idx % tick_interval == 0 else 10
                         self._canvas.create_line(x, y_axis - tick_len, x, y_axis + tick_len, fill="white", width=2)
@@ -160,7 +162,9 @@ class OverlayWindow:
                 for i in range(count):
                     display_idx = (led_index + self.calibration.offset) % total_leds
                     if i == 0 or i == count - 1 or display_idx % tick_interval == 0:
-                        frac = i / count if count > 1 else 0.5
+                        frac = i / (count - 1) if count > 1 else 0.5
+                        if seg.reverse:
+                            frac = 1.0 - frac
                         x = start_px + frac * (end_px - start_px)
                         tick_len = 15 if display_idx % tick_interval == 0 else 10
                         self._canvas.create_line(x, y_axis - tick_len, x, y_axis + tick_len, fill="white", width=2)
@@ -178,7 +182,9 @@ class OverlayWindow:
                 for i in range(count):
                     display_idx = (led_index + self.calibration.offset) % total_leds
                     if i == 0 or i == count - 1 or display_idx % tick_interval == 0:
-                        frac = i / count if count > 1 else 0.5
+                        frac = i / (count - 1) if count > 1 else 0.5
+                        if seg.reverse:
+                            frac = 1.0 - frac
                         y = start_px + frac * (end_px - start_px)
                         tick_len = 15 if display_idx % tick_interval == 0 else 10
                         self._canvas.create_line(x_axis - tick_len, y, x_axis + tick_len, y, fill="white", width=2)
@@ -196,7 +202,9 @@ class OverlayWindow:
                 for i in range(count):
                     display_idx = (led_index + self.calibration.offset) % total_leds
                     if i == 0 or i == count - 1 or display_idx % tick_interval == 0:
-                        frac = i / count if count > 1 else 0.5
+                        frac = i / (count - 1) if count > 1 else 0.5
+                        if seg.reverse:
+                            frac = 1.0 - frac
                         y = start_px + frac * (end_px - start_px)
                         tick_len = 15 if display_idx % tick_interval == 0 else 10
                         self._canvas.create_line(x_axis - tick_len, y, x_axis + tick_len, y, fill="white", width=2)