diff --git a/web/src/components/settings/CameraWizardDialog.tsx b/web/src/components/settings/CameraWizardDialog.tsx
index 5846fd9a2..74969290a 100644
--- a/web/src/components/settings/CameraWizardDialog.tsx
+++ b/web/src/components/settings/CameraWizardDialog.tsx
@@ -20,7 +20,10 @@ import type {
   CameraConfigData,
   ConfigSetBody,
 } from "@/types/cameraWizard";
-import { processCameraName } from "@/utils/cameraUtil";
+import {
+  processCameraName,
+  calculateDetectDimensions,
+} from "@/utils/cameraUtil";
 import { cn } from "@/lib/utils";
 
 type WizardState = {
@@ -203,6 +206,25 @@ export default function CameraWizardDialog({
         },
       };
 
+      // Calculate detect dimensions from the detect stream's probed resolution
+      const detectStream = wizardData.streams.find((stream) =>
+        stream.roles.includes("detect"),
+      );
+      if (detectStream?.testResult?.resolution) {
+        const [streamWidth, streamHeight] = detectStream.testResult.resolution
+          .split("x")
+          .map(Number);
+        if (streamWidth > 0 && streamHeight > 0) {
+          const detectDimensions = calculateDetectDimensions(
+            streamWidth,
+            streamHeight,
+          );
+          if (detectDimensions) {
+            configData.cameras[finalCameraName].detect = detectDimensions;
+          }
+        }
+      }
+
       // Add live.streams configuration for go2rtc streams
       if (wizardData.streams && wizardData.streams.length > 0) {
         configData.cameras[finalCameraName].live = {