diff --git a/ts/ConversationController.ts b/ts/ConversationController.ts
index c77ec5c0f..42ff09139 100644
--- a/ts/ConversationController.ts
+++ b/ts/ConversationController.ts
@@ -1,4 +1,4 @@
-// Copyright 2020-2021 Signal Messenger, LLC
+// Copyright 2020-2022 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only
 
 import { debounce, uniq, without } from 'lodash';
@@ -14,8 +14,8 @@ import type { ConversationModel } from './models/conversations';
 import { getContactId } from './messages/helpers';
 import { maybeDeriveGroupV2Id } from './groups';
 import { assert } from './util/assert';
-import { map, reduce } from './util/iterables';
 import { isGroupV1, isGroupV2 } from './util/whatTypeOfConversation';
+import { getConversationUnreadCountForAppBadge } from './util/getConversationUnreadCountForAppBadge';
 import { UUID, isValidUuid } from './types/UUID';
 import { Address } from './types/Address';
 import { QualifiedAddress } from './types/QualifiedAddress';
@@ -53,7 +53,10 @@ export function start(): void {
         1000
       );
 
-      this.on('add remove change:unreadCount', debouncedUpdateUnreadCount);
+      this.on(
+        'add remove change:unreadCount change:markedUnread change:isArchived change:muteExpiresAt',
+        debouncedUpdateUnreadCount
+      );
       window.Whisper.events.on('updateUnreadCount', debouncedUpdateUnreadCount);
       this.on('add', (model: ConversationModel): void => {
         // If the conversation is muted we set a timeout so when the mute expires
@@ -70,32 +73,16 @@ export function start(): void {
       }
     },
     updateUnreadCount() {
-      const canCountMutedConversations = window.storage.get(
-        'badge-count-muted-conversations'
-      );
+      const canCountMutedConversations =
+        window.storage.get('badge-count-muted-conversations') || false;
 
-      const canCount = (m: ConversationModel) =>
-        !m.isMuted() || canCountMutedConversations;
-
-      const getUnreadCount = (m: ConversationModel) => {
-        const unreadCount = m.get('unreadCount');
-
-        if (unreadCount) {
-          return unreadCount;
-        }
-
-        if (m.get('markedUnread')) {
-          return 1;
-        }
-
-        return 0;
-      };
-
-      const newUnreadCount = reduce(
-        map(this, (m: ConversationModel) =>
-          canCount(m) ? getUnreadCount(m) : 0
-        ),
-        (item: number, memo: number) => (item || 0) + memo,
+      const newUnreadCount = this.reduce(
+        (result: number, conversation: ConversationModel) =>
+          result +
+          getConversationUnreadCountForAppBadge(
+            conversation.attributes,
+            canCountMutedConversations
+          ),
         0
       );
       window.storage.put('unreadCount', newUnreadCount);
diff --git a/ts/models/conversations.ts b/ts/models/conversations.ts
index ab8a3e540..89265dc1b 100644
--- a/ts/models/conversations.ts
+++ b/ts/models/conversations.ts
@@ -4278,8 +4278,6 @@ export class ConversationModel extends window.Backbone
     if (Boolean(previousMarkedUnread) !== Boolean(markedUnread)) {
       this.captureChange('markedUnread');
     }
-
-    window.Whisper.events.trigger('updateUnreadCount');
   }
 
   async refreshGroupLink(): Promise<void> {
diff --git a/ts/test-both/util/getConversationUnreadCountForAppBadge_test.ts b/ts/test-both/util/getConversationUnreadCountForAppBadge_test.ts
new file mode 100644
index 000000000..b8e04a0c7
--- /dev/null
+++ b/ts/test-both/util/getConversationUnreadCountForAppBadge_test.ts
@@ -0,0 +1,100 @@
+// Copyright 2022 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+
+import { getConversationUnreadCountForAppBadge } from '../../util/getConversationUnreadCountForAppBadge';
+
+describe('getConversationUnreadCountForAppBadge', () => {
+  const getCount = getConversationUnreadCountForAppBadge;
+
+  const mutedTimestamp = (): number => Date.now() + 12345;
+  const oldMutedTimestamp = (): number => Date.now() - 1000;
+
+  it('returns 0 if the conversation is archived', () => {
+    const archivedConversations = [
+      { isArchived: true, markedUnread: false, unreadCount: 0 },
+      { isArchived: true, markedUnread: false, unreadCount: 123 },
+      { isArchived: true, markedUnread: true, unreadCount: 0 },
+      { isArchived: true, markedUnread: true },
+    ];
+    for (const conversation of archivedConversations) {
+      assert.strictEqual(getCount(conversation, true), 0);
+      assert.strictEqual(getCount(conversation, false), 0);
+    }
+  });
+
+  it("returns 0 if the conversation is muted and the user doesn't want to include those in the result", () => {
+    const mutedConversations = [
+      { muteExpiresAt: mutedTimestamp(), markedUnread: false, unreadCount: 0 },
+      { muteExpiresAt: mutedTimestamp(), markedUnread: false, unreadCount: 9 },
+      { muteExpiresAt: mutedTimestamp(), markedUnread: true, unreadCount: 0 },
+      { muteExpiresAt: mutedTimestamp(), markedUnread: true },
+    ];
+    for (const conversation of mutedConversations) {
+      assert.strictEqual(getCount(conversation, false), 0);
+    }
+  });
+
+  it('returns the unread count if nonzero (and not archived)', () => {
+    const conversationsWithUnreadCount = [
+      { unreadCount: 9, markedUnread: false },
+      { unreadCount: 9, markedUnread: true },
+      {
+        unreadCount: 9,
+        markedUnread: false,
+        muteExpiresAt: oldMutedTimestamp(),
+      },
+      { unreadCount: 9, markedUnread: false, isArchived: false },
+    ];
+    for (const conversation of conversationsWithUnreadCount) {
+      assert.strictEqual(getCount(conversation, false), 9);
+      assert.strictEqual(getCount(conversation, true), 9);
+    }
+
+    const mutedWithUnreads = {
+      unreadCount: 123,
+      markedUnread: false,
+      muteExpiresAt: mutedTimestamp(),
+    };
+    assert.strictEqual(getCount(mutedWithUnreads, true), 123);
+  });
+
+  it('returns 1 if the conversation is marked unread', () => {
+    const conversationsMarkedUnread = [
+      { markedUnread: true },
+      { markedUnread: true, unreadCount: 0 },
+      { markedUnread: true, muteExpiresAt: oldMutedTimestamp() },
+      {
+        markedUnread: true,
+        muteExpiresAt: oldMutedTimestamp(),
+        isArchived: false,
+      },
+    ];
+    for (const conversation of conversationsMarkedUnread) {
+      assert.strictEqual(getCount(conversation, false), 1);
+      assert.strictEqual(getCount(conversation, true), 1);
+    }
+
+    const mutedConversationsMarkedUnread = [
+      { markedUnread: true, muteExpiresAt: mutedTimestamp() },
+      { markedUnread: true, muteExpiresAt: mutedTimestamp(), unreadCount: 0 },
+    ];
+    for (const conversation of mutedConversationsMarkedUnread) {
+      assert.strictEqual(getCount(conversation, true), 1);
+    }
+  });
+
+  it('returns 0 if the conversation is read', () => {
+    const readConversations = [
+      { markedUnread: false },
+      { markedUnread: false, unreadCount: 0 },
+      { markedUnread: false, mutedTimestamp: mutedTimestamp() },
+      { markedUnread: false, mutedTimestamp: oldMutedTimestamp() },
+    ];
+    for (const conversation of readConversations) {
+      assert.strictEqual(getCount(conversation, false), 0);
+      assert.strictEqual(getCount(conversation, true), 0);
+    }
+  });
+});
diff --git a/ts/util/getConversationUnreadCountForAppBadge.ts b/ts/util/getConversationUnreadCountForAppBadge.ts
new file mode 100644
index 000000000..ab53f8d44
--- /dev/null
+++ b/ts/util/getConversationUnreadCountForAppBadge.ts
@@ -0,0 +1,35 @@
+// Copyright 2022 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { ConversationAttributesType } from '../model-types.d';
+import { isConversationMuted } from './isConversationMuted';
+
+export function getConversationUnreadCountForAppBadge(
+  conversation: Readonly<
+    Pick<
+      ConversationAttributesType,
+      'isArchived' | 'markedUnread' | 'muteExpiresAt' | 'unreadCount'
+    >
+  >,
+  canCountMutedConversations: boolean
+): number {
+  const { isArchived, markedUnread, unreadCount } = conversation;
+
+  if (isArchived) {
+    return 0;
+  }
+
+  if (!canCountMutedConversations && isConversationMuted(conversation)) {
+    return 0;
+  }
+
+  if (unreadCount) {
+    return unreadCount;
+  }
+
+  if (markedUnread) {
+    return 1;
+  }
+
+  return 0;
+}