diff --git a/src/tools/chmod-calculator/chmod-calculator.service.test.ts b/src/tools/chmod-calculator/chmod-calculator.service.test.ts
index 426c4a56..4b52ee2e 100644
--- a/src/tools/chmod-calculator/chmod-calculator.service.test.ts
+++ b/src/tools/chmod-calculator/chmod-calculator.service.test.ts
@@ -1,5 +1,7 @@
 import { describe, expect, it } from 'vitest';
-import { computeChmodOctalRepresentation, computeChmodSymbolicRepresentation } from './chmod-calculator.service';
+import {
+  checkSymbolicString, computeChmodOctalRepresentation, computeChmodSymbolicRepresentation, symbolicToOctal,
+} from './chmod-calculator.service';
 
 describe('chmod-calculator', () => {
   describe('computeChmodOctalRepresentation', () => {
@@ -127,4 +129,175 @@ describe('chmod-calculator', () => {
       ).to.eql('-w--w--w-');
     });
   });
+  describe('symbolicToNumeric', () => {
+    it('should return the correct octal value for symbolic strings', () => {
+      expect(symbolicToOctal('rwxrwxrwx')).toBe(777);
+      expect(symbolicToOctal('drwxrwxrwx')).toBe(777);
+      expect(symbolicToOctal('-rwxrwxrwx')).toBe(777);
+      expect(symbolicToOctal('lrwxrwxrwx')).toBe(777);
+
+      expect(symbolicToOctal('rwxr-xr-x')).toBe(755);
+      expect(symbolicToOctal('drwxr-xr-x')).toBe(755);
+      expect(symbolicToOctal('-rwxr-xr-x')).toBe(755);
+      expect(symbolicToOctal('lrwxr-xr-x')).toBe(755);
+
+      expect(symbolicToOctal('rwxrwxr-x')).toBe(775);
+      expect(symbolicToOctal('drwxrwxr-x')).toBe(775);
+      expect(symbolicToOctal('-rwxrwxr-x')).toBe(775);
+      expect(symbolicToOctal('lrwxrwxr-x')).toBe(775);
+
+      expect(symbolicToOctal('rw-r--r--')).toBe(644);
+      expect(symbolicToOctal('drw-r--r--')).toBe(644);
+      expect(symbolicToOctal('-rw-r--r--')).toBe(644);
+      expect(symbolicToOctal('lrw-r--r--')).toBe(644);
+
+      expect(symbolicToOctal('rw-------')).toBe(600);
+      expect(symbolicToOctal('drw-------')).toBe(600);
+      expect(symbolicToOctal('-rw-------')).toBe(600);
+      expect(symbolicToOctal('lrw-------')).toBe(600);
+
+      expect(symbolicToOctal('rwx------')).toBe(700);
+      expect(symbolicToOctal('drwx------')).toBe(700);
+      expect(symbolicToOctal('-rwx------')).toBe(700);
+      expect(symbolicToOctal('lrwx------')).toBe(700);
+
+      expect(symbolicToOctal('rw-rw-rw-')).toBe(666);
+      expect(symbolicToOctal('drw-rw-rw-')).toBe(666);
+      expect(symbolicToOctal('-rw-rw-rw-')).toBe(666);
+      expect(symbolicToOctal('lrw-rw-rw-')).toBe(666);
+
+      expect(symbolicToOctal('r--------')).toBe(400);
+      expect(symbolicToOctal('dr--------')).toBe(400);
+      expect(symbolicToOctal('-r--------')).toBe(400);
+      expect(symbolicToOctal('lr--------')).toBe(400);
+
+      expect(symbolicToOctal('rw-rw-r--')).toBe(664);
+      expect(symbolicToOctal('drw-rw-r--')).toBe(664);
+      expect(symbolicToOctal('-rw-rw-r--')).toBe(664);
+      expect(symbolicToOctal('lrw-rw-r--')).toBe(664);
+
+      expect(symbolicToOctal('rwxr--r--')).toBe(744);
+      expect(symbolicToOctal('drwxr--r--')).toBe(744);
+      expect(symbolicToOctal('-rwxr--r--')).toBe(744);
+      expect(symbolicToOctal('lrwxr--r--')).toBe(744);
+
+      expect(symbolicToOctal('rwxrwx---')).toBe(770);
+      expect(symbolicToOctal('drwxrwx---')).toBe(770);
+      expect(symbolicToOctal('-rwxrwx---')).toBe(770);
+      expect(symbolicToOctal('lrwxrwx---')).toBe(770);
+
+      expect(symbolicToOctal('r--r--r--')).toBe(444);
+      expect(symbolicToOctal('dr--r--r--')).toBe(444);
+      expect(symbolicToOctal('-r--r--r--')).toBe(444);
+      expect(symbolicToOctal('lr--r--r--')).toBe(444);
+
+      expect(symbolicToOctal('r-xr-xr-x')).toBe(555);
+      expect(symbolicToOctal('dr-xr-xr-x')).toBe(555);
+      expect(symbolicToOctal('-r-xr-xr-x')).toBe(555);
+      expect(symbolicToOctal('lr-xr-xr-x')).toBe(555);
+
+      expect(symbolicToOctal('---------')).toBe(0o00);
+      expect(symbolicToOctal('d---------')).toBe(0o00);
+      expect(symbolicToOctal('----------')).toBe(0o00);
+      expect(symbolicToOctal('l---------')).toBe(0o00);
+    });
+  });
+
+  describe('validateSymbolicInput', () => {
+    it('should return a non-empty error message for invalid duplicate entity permissions', () => {
+      expect(checkSymbolicString('rrwrwxrwx')).not.toBe('');
+      expect(checkSymbolicString('drrwrwxrwx')).not.toBe('');
+      expect(checkSymbolicString('-rrwrwxrwx')).not.toBe('');
+      expect(checkSymbolicString('lrrwrwxrwx')).not.toBe('');
+
+      expect(checkSymbolicString('rrwxrwxrw')).not.toBe('');
+      expect(checkSymbolicString('drrwxrwxrw')).not.toBe('');
+      expect(checkSymbolicString('-rrwxrwxrw')).not.toBe('');
+      expect(checkSymbolicString('lrrwxrwxrw')).not.toBe('');
+
+      expect(checkSymbolicString('rwrwrrxwx')).not.toBe('');
+      expect(checkSymbolicString('drwrwrrxwx')).not.toBe('');
+      expect(checkSymbolicString('-rwrwrrxwx')).not.toBe('');
+      expect(checkSymbolicString('lwrwrrxwx')).not.toBe('');
+
+      expect(checkSymbolicString('rwrwxrrwx')).not.toBe('');
+      expect(checkSymbolicString('drwrwxrrwx')).not.toBe('');
+      expect(checkSymbolicString('-rwrwxrrwx')).not.toBe('');
+      expect(checkSymbolicString('lrwrwxrrwx')).not.toBe('');
+
+      expect(checkSymbolicString('rwxrrwrwx')).not.toBe('');
+      expect(checkSymbolicString('drwxrrwrwx')).not.toBe('');
+      expect(checkSymbolicString('-rwxrrwrwx')).not.toBe('');
+      expect(checkSymbolicString('lwxrrwrwx')).not.toBe('');
+
+      expect(checkSymbolicString('rwxrwrwrx')).not.toBe('');
+      expect(checkSymbolicString('drwxrwrwrx')).not.toBe('');
+      expect(checkSymbolicString('-rwxrwrwrx')).not.toBe('');
+      expect(checkSymbolicString('lwxrwrwrx')).not.toBe('');
+
+      expect(checkSymbolicString('rrwrwrwxw')).not.toBe('');
+      expect(checkSymbolicString('drrwrwrwxw')).not.toBe('');
+      expect(checkSymbolicString('-rrwrwrwxw')).not.toBe('');
+      expect(checkSymbolicString('lrrwrwrwxw')).not.toBe('');
+
+      expect(checkSymbolicString('rrwxwrrwx')).not.toBe('');
+      expect(checkSymbolicString('drrwxwrrwx')).not.toBe('');
+      expect(checkSymbolicString('-rrwxwrrwx')).not.toBe('');
+      expect(checkSymbolicString('lrrwxwrrwx')).not.toBe('');
+
+      expect(checkSymbolicString('rwrwrrwxr')).not.toBe('');
+      expect(checkSymbolicString('drwrwrrwxr')).not.toBe('');
+      expect(checkSymbolicString('-rwrwrrwxr')).not.toBe('');
+      expect(checkSymbolicString('lwrwrrwxr')).not.toBe('');
+
+      expect(checkSymbolicString('rwrwxrwrw')).not.toBe('');
+      expect(checkSymbolicString('drwrwxrwrw')).not.toBe('');
+      expect(checkSymbolicString('-rwrwxrwrw')).not.toBe('');
+      expect(checkSymbolicString('lwrwxrwrw')).not.toBe('');
+
+      expect(checkSymbolicString('rwxrrwxrw')).not.toBe('');
+      expect(checkSymbolicString('drwxrrwxrw')).not.toBe('');
+      expect(checkSymbolicString('-rwxrrwxrw')).not.toBe('');
+      expect(checkSymbolicString('lrwxrrwxrw')).not.toBe('');
+
+      expect(checkSymbolicString('rww--rwrw-')).not.toBe('');
+      expect(checkSymbolicString('drww--rwrw-')).not.toBe('');
+      expect(checkSymbolicString('-rww--rwrw-')).not.toBe('');
+      expect(checkSymbolicString('lrww--rwrw-')).not.toBe('');
+
+      expect(checkSymbolicString('r--wrrwxr')).not.toBe('');
+      expect(checkSymbolicString('dr--wrrwxr')).not.toBe('');
+      expect(checkSymbolicString('-r--wrrwxr')).not.toBe('');
+      expect(checkSymbolicString('lr--wrrwxr')).not.toBe('');
+
+      expect(checkSymbolicString('rw--rrwxr-')).not.toBe('');
+      expect(checkSymbolicString('drw--rrwxr-')).not.toBe('');
+      expect(checkSymbolicString('-rw--rrwxr-')).not.toBe('');
+      expect(checkSymbolicString('lrw--rrwxr-')).not.toBe('');
+    });
+  });
+  describe('validateSymbolicInput', () => {
+    describe('validateOrder', () => {
+      it('should correctly validate the order of permissions', () => {
+        expect(checkSymbolicString('-rwxrwxrwx')).toBe('');
+        expect(checkSymbolicString('drwxrwxrwx')).toBe('');
+        expect(checkSymbolicString('lrwxrwxrwx')).toBe('');
+        expect(checkSymbolicString('brwxrwxrwx')).toBe('');
+        expect(checkSymbolicString('crwxrwxrwx')).toBe('');
+        expect(checkSymbolicString('srwxrwxrwx')).toBe('');
+        expect(checkSymbolicString('prwxrwxrwx')).toBe('');
+
+        expect(checkSymbolicString('rwxrwxrwx')).toBe('');
+        expect(checkSymbolicString('rw-r--r--')).toBe('');
+        expect(checkSymbolicString('r-xr-xr-x')).toBe('');
+        expect(checkSymbolicString('-wxrw-r-x')).toBe('');
+        expect(checkSymbolicString('rwxrw-r-x')).toBe('');
+        expect(checkSymbolicString('rwxr-xrw-')).toBe('');
+        expect(checkSymbolicString('rwxr-xrw-')).toBe('');
+        expect(checkSymbolicString('rxwr-xrw-')).toBe('User permissions should be in the order of \'r\', \'w\', \'x\'.');
+        expect(checkSymbolicString('rwxr-wrw-')).toBe('Group permissions should be in the order of \'r\', \'w\', \'x\'.');
+        expect(checkSymbolicString('rwxr-xr-w')).toBe('Public permissions should be in the order of \'r\', \'w\', \'x\'.');
+      });
+    });
+  });
 });
diff --git a/src/tools/chmod-calculator/chmod-calculator.service.ts b/src/tools/chmod-calculator/chmod-calculator.service.ts
index e0046717..f30a2321 100644
--- a/src/tools/chmod-calculator/chmod-calculator.service.ts
+++ b/src/tools/chmod-calculator/chmod-calculator.service.ts
@@ -1,7 +1,13 @@
 import _ from 'lodash';
 import type { GroupPermissions, Permissions } from './chmod-calculator.types';
 
-export { computeChmodOctalRepresentation, computeChmodSymbolicRepresentation };
+export {
+  computeChmodOctalRepresentation,
+  computeChmodSymbolicRepresentation,
+  symbolicToOctal,
+  checkSymbolicString,
+  validateCharPositions,
+};
 
 function computeChmodOctalRepresentation({ permissions }: { permissions: Permissions }): string {
   const permissionValue = { read: 4, write: 2, execute: 1 };
@@ -28,3 +34,79 @@ function computeChmodSymbolicRepresentation({ permissions }: { permissions: Perm
     getGroupPermissionValue(permissions.public),
   ].join('');
 }
+
+function validateCharPositions(permissionSet: string): boolean {
+  const validChars = ['r', 'w', 'x'];
+  for (let i = 0; i < 3; i++) {
+    const permSetCharCurrent = permissionSet.charAt(i);
+    const validCharCurent = validChars[i];
+    if (permissionSet.charAt(i) !== '-' && permSetCharCurrent !== validCharCurent) {
+      return false;
+    }
+  }
+  return true;
+}
+
+function checkDuplicateInGroup(group: string): boolean {
+  const validPermissions = ['r', 'w', 'x'];
+  const permissions = group.split('').filter(p => validPermissions.includes(p));
+  const uniquePermissions = new Set(permissions);
+  return permissions.length !== uniquePermissions.size;
+}
+
+function symbolicToOctal(symbolic: string): number {
+  const symbolicMap: Record<string, number> = {
+    'r': 4,
+    'w': 2,
+    'x': 1,
+    '-': 0,
+  };
+
+  const userPart = symbolic.length === 10 ? symbolic.slice(1, 4) : symbolic.slice(0, 3);
+  const groupPart = symbolic.length === 10 ? symbolic.slice(4, 7) : symbolic.slice(3, 6);
+  const publicPart = symbolic.length === 10 ? symbolic.slice(7, 10) : symbolic.slice(6, 9);
+
+  const userNumeric = userPart.split('').reduce((sum, value) => sum + (symbolicMap[value] || 0), 0);
+  const groupNumeric = groupPart.split('').reduce((sum, value) => sum + (symbolicMap[value] || 0), 0);
+  const publicNumeric = publicPart.split('').reduce((sum, value) => sum + (symbolicMap[value] || 0), 0);
+
+  return userNumeric * 100 + groupNumeric * 10 + publicNumeric;
+}
+
+function checkSymbolicString(symbolicInput: string): string {
+  const permissionsRegex = /^([-dlbcsp])?[rwx-]{9}$/;
+
+  if (symbolicInput.length === 0) {
+    return '';
+  }
+  if (symbolicInput.length > 10) {
+    return 'Invalid length.';
+  }
+  if (!permissionsRegex.test(symbolicInput)) {
+    return 'Invalid permission pattern.';
+  }
+
+  const userPermissions = symbolicInput.slice(-9, -6);
+  const groupPermissions = symbolicInput.slice(-6, -3);
+  const publicPermissions = symbolicInput.slice(-3);
+
+  if (checkDuplicateInGroup(userPermissions)) {
+    return 'Duplicate rights are not allowed in the user section.';
+  }
+  if (checkDuplicateInGroup(groupPermissions)) {
+    return 'Duplicate rights are not allowed in the group section.';
+  }
+  if (checkDuplicateInGroup(publicPermissions)) {
+    return 'Duplicate rights are not allowed in the public section.';
+  }
+  if (!validateCharPositions(userPermissions)) {
+    return 'User permissions should be in the order of \'r\', \'w\', \'x\'.';
+  }
+  if (!validateCharPositions(groupPermissions)) {
+    return 'Group permissions should be in the order of \'r\', \'w\', \'x\'.';
+  }
+  if (!validateCharPositions(publicPermissions)) {
+    return 'Public permissions should be in the order of \'r\', \'w\', \'x\'.';
+  }
+  return '';
+}
diff --git a/src/tools/chmod-calculator/chmod-calculator.vue b/src/tools/chmod-calculator/chmod-calculator.vue
index ba6f4498..50dd6ed8 100644
--- a/src/tools/chmod-calculator/chmod-calculator.vue
+++ b/src/tools/chmod-calculator/chmod-calculator.vue
@@ -1,8 +1,13 @@
 <script setup lang="ts">
 import { useThemeVars } from 'naive-ui';
-
+import { computed, ref } from 'vue';
 import InputCopyable from '../../components/InputCopyable.vue';
-import { computeChmodOctalRepresentation, computeChmodSymbolicRepresentation } from './chmod-calculator.service';
+import {
+  checkSymbolicString,
+  computeChmodOctalRepresentation,
+  computeChmodSymbolicRepresentation,
+  symbolicToOctal,
+} from './chmod-calculator.service';
 
 import type { Group, Scope } from './chmod-calculator.types';
 
@@ -21,48 +26,65 @@ const permissions = ref({
   public: { read: false, write: false, execute: false },
 });
 
+const symbolicInput = ref('');
+
 const octal = computed(() => computeChmodOctalRepresentation({ permissions: permissions.value }));
 const symbolic = computed(() => computeChmodSymbolicRepresentation({ permissions: permissions.value }));
+const computedOctal = computed(() => symbolicToOctal(symbolicInput.value));
 </script>
 
 <template>
   <div>
-    <n-table :bordered="false" :bottom-bordered="false" single-column class="permission-table">
-      <thead>
-        <tr>
-          <th class="text-center" scope="col" />
-          <th class="text-center" scope="col">
-            Owner (u)
-          </th>
-          <th class="text-center" scope="col">
-            Group (g)
-          </th>
-          <th class="text-center" scope="col">
-            Public (o)
-          </th>
-        </tr>
-      </thead>
-      <tbody>
-        <tr v-for="{ scope, title } of scopes" :key="scope">
-          <td class="line-header">
-            {{ title }}
-          </td>
-          <td v-for="group of groups" :key="group" class="text-center">
-            <!-- <n-switch v-model:value="permissions[group][scope]" /> -->
-            <n-checkbox v-model:checked="permissions[group][scope]" size="large" />
-          </td>
-        </tr>
-      </tbody>
-    </n-table>
-
-    <div class="octal-result">
-      {{ octal }}
-    </div>
-    <div class="octal-result">
-      {{ symbolic }}
-    </div>
+    <c-card title="Calculate octal and symbolic permissions">
+      <n-table :bordered="false" :bottom-bordered="false" single-column class="permission-table">
+        <thead>
+          <tr>
+            <th class="text-center" scope="col" />
+            <th class="text-center" scope="col">
+              Owner (u)
+            </th>
+            <th class="text-center" scope="col">
+              Group (g)
+            </th>
+            <th class="text-center" scope="col">
+              Public (o)
+            </th>
+          </tr>
+        </thead>
+        <tbody>
+          <tr v-for="{ scope, title } of scopes" :key="scope">
+            <td class="line-header">
+              {{ title }}
+            </td>
+            <td v-for="group of groups" :key="group" class="text-center">
+              <!-- <n-switch v-model:value="permissions[group][scope]" /> -->
+              <n-checkbox v-model:checked="permissions[group][scope]" size="large" />
+            </td>
+          </tr>
+        </tbody>
+      </n-table>
 
-    <InputCopyable :value="`chmod ${octal} path`" readonly />
+      <div class="octal-result">
+        {{ octal }}
+      </div>
+      <div class="octal-result">
+        {{ symbolic }}
+      </div>
+      <InputCopyable :value="`chmod ${octal} path`" readonly />
+    </c-card>
+    <c-card title="Convert symbolic permission string to octal value">
+      <p>For permission strings of length 10:<br>The first character represents the file type: "-" for a regular file, "d" for a directory, "l" for a symbolic link.</p>
+      <n-form-item label="Permission string" label-placement="left">
+        <c-input-text v-model:value="symbolicInput" placeholder="-rw-r--r--" w-full />
+      </n-form-item>
+      <n-alert v-if="checkSymbolicString(symbolicInput)" style="margin-top: 25px" type="error">
+        {{ checkSymbolicString(symbolicInput) }}
+      </n-alert>
+      <div class="octal-result">
+        {{ computedOctal }}
+      </div>
+      <InputCopyable :value="`chmod ${computedOctal} path`" readonly />
+    </c-card>
   </div>
 </template>