diff --git a/EssentialCSharp.Web.Tests/SiteMappingTests.cs b/EssentialCSharp.Web.Tests/SiteMappingTests.cs
index cb2c8f52..cf4c2c34 100644
--- a/EssentialCSharp.Web.Tests/SiteMappingTests.cs
+++ b/EssentialCSharp.Web.Tests/SiteMappingTests.cs
@@ -82,4 +82,71 @@ public void FindCSyntaxFundamentalsSanitizedWithAnchorReturnsCorrectSiteMap()
         Assert.NotNull(foundSiteMap);
         Assert.Equivalent(CSyntaxFundamentalsSiteMapping, foundSiteMap);
     }
+
+    [Fact]
+    public void FindPercentComplete_KeyIsNull_ReturnsNull()
+    {
+        // Arrange
+
+        // Act
+        string? percent = GetSiteMap().FindPercentComplete(null!);
+
+        // Assert
+        Assert.Null(percent);
+    }
+
+    [Theory]
+    [InlineData("   ")]
+    [InlineData("")]
+    public void FindPercentComplete_KeyIsWhiteSpace_ThrowsArgumentException(string? key)
+    {
+        // Arrange
+
+        // Act
+
+        // Assert
+        Assert.Throws<ArgumentException>(() =>
+        {
+            GetSiteMap().FindPercentComplete(key);
+        });
+    }
+
+    [Theory]
+    [InlineData("hello-world", "50.00")]
+    [InlineData("c-syntax-fundamentals", "100.00")]
+    public void FindPercentComplete_ValidKey_Success(string? key, string result)
+    {
+        // Arrange
+
+        // Act
+        string? percent = GetSiteMap().FindPercentComplete(key);
+
+        // Assert
+        Assert.Equal(result, percent);
+    }
+
+    [Fact]
+    public void FindPercentComplete_EmptySiteMappings_ReturnsZeroPercent()
+    {
+        // Arrange
+        IList<SiteMapping> siteMappings = new List<SiteMapping>();
+
+        // Act
+        string? percent = siteMappings.FindPercentComplete("test");
+
+        // Assert
+        Assert.Equal("0.00", percent);
+    }
+
+    [Fact]
+    public void FindPercentComplete_KeyNotFound_ReturnsZeroPercent()
+    {
+        // Arrange
+
+        // Act
+        string? percent = GetSiteMap().FindPercentComplete("non-existent-key");
+
+        // Assert
+        Assert.Equal("0.00", percent);
+    }
 }
diff --git a/EssentialCSharp.Web/Controllers/HomeController.cs b/EssentialCSharp.Web/Controllers/HomeController.cs
index 21b9d903..3495a7d6 100644
--- a/EssentialCSharp.Web/Controllers/HomeController.cs
+++ b/EssentialCSharp.Web/Controllers/HomeController.cs
@@ -30,6 +30,7 @@ public IActionResult Index()
 
             ViewBag.PageTitle = siteMapping.IndentLevel is 0 ? siteMapping.ChapterTitle + " " + siteMapping.RawHeading : siteMapping.RawHeading;
             ViewBag.NextPage = FlipPage(siteMapping!.ChapterNumber, siteMapping.PageNumber, true);
+            ViewBag.CurrentPageKey = siteMapping.PrimaryKey;
             ViewBag.PreviousPage = FlipPage(siteMapping.ChapterNumber, siteMapping.PageNumber, false);
             ViewBag.HeadContents = headHtml;
             ViewBag.Contents = html;
diff --git a/EssentialCSharp.Web/Extensions/SiteMappingListExtensions.cs b/EssentialCSharp.Web/Extensions/SiteMappingListExtensions.cs
index 28ae5643..617f5517 100644
--- a/EssentialCSharp.Web/Extensions/SiteMappingListExtensions.cs
+++ b/EssentialCSharp.Web/Extensions/SiteMappingListExtensions.cs
@@ -1,4 +1,6 @@
-namespace EssentialCSharp.Web.Extensions;
+using System.Globalization;
+
+namespace EssentialCSharp.Web.Extensions;
 
 public static class SiteMappingListExtensions
 {
@@ -23,4 +25,51 @@ public static class SiteMappingListExtensions
         }
         return null;
     }
+    /// <summary>
+    /// Finds percent complete based on a key.
+    /// </summary>
+    /// <param name="siteMappings">IList of SiteMappings</param>
+    /// <param name="key">The key to search for. If null, returns null.</param>
+    /// <returns>Returns a formatted double for use as the percent complete.</returns>
+    public static string? FindPercentComplete(this IList<SiteMapping> siteMappings, string? key)
+    {
+        if (key is null)
+        {
+            return null;
+        }
+        if (key.Trim().Length is 0)
+        {
+            throw new ArgumentException("Parameter 'key' cannot be null or whitespace.", nameof(key));
+        }
+        int currentMappingCount = 0;
+        int overallMappingCount = 0;
+        bool currentPageFound = false;
+        IEnumerable<IGrouping<int, SiteMapping>> chapterGroupings = siteMappings.GroupBy(x => x.ChapterNumber).OrderBy(g => g.Key);
+        foreach (IGrouping<int, SiteMapping> chapterGrouping in chapterGroupings)
+        {
+            IEnumerable<IGrouping<int, SiteMapping>> pageGroupings = chapterGrouping.GroupBy(x => x.PageNumber).OrderBy(g => g.Key);
+            foreach (IGrouping<int, SiteMapping> pageGrouping in pageGroupings)
+            {
+                foreach (SiteMapping siteMapping in pageGrouping)
+                {
+                    if (!currentPageFound)
+                    {
+                        currentMappingCount++;
+                    }
+                    overallMappingCount++;
+                    if (siteMapping.PrimaryKey == key)
+                    {
+                        currentPageFound = true;
+                    }
+                }
+            }
+        }
+        if (overallMappingCount is 0 || !currentPageFound)
+        {
+            return "0.00";
+        }
+
+        double result = (double)currentMappingCount / overallMappingCount * 100;
+        return string.Format(CultureInfo.InvariantCulture, "{0:0.00}", result);
+    }
 }
diff --git a/EssentialCSharp.Web/Services/ISiteMappingService.cs b/EssentialCSharp.Web/Services/ISiteMappingService.cs
index ac2a719e..f754eaa3 100644
--- a/EssentialCSharp.Web/Services/ISiteMappingService.cs
+++ b/EssentialCSharp.Web/Services/ISiteMappingService.cs
@@ -1,4 +1,4 @@
-namespace EssentialCSharp.Web.Services;
+namespace EssentialCSharp.Web.Services;
 
 public interface ISiteMappingService
 {
diff --git a/EssentialCSharp.Web/Services/SiteMappingService.cs b/EssentialCSharp.Web/Services/SiteMappingService.cs
index 9eafb3a9..c435d14f 100644
--- a/EssentialCSharp.Web/Services/SiteMappingService.cs
+++ b/EssentialCSharp.Web/Services/SiteMappingService.cs
@@ -1,4 +1,4 @@
-using EssentialCSharp.Web.Models;
+using System.Globalization;
 
 namespace EssentialCSharp.Web.Services;
 
@@ -12,7 +12,6 @@ public SiteMappingService(IWebHostEnvironment webHostEnvironment)
         List<SiteMapping>? siteMappings = System.Text.Json.JsonSerializer.Deserialize<List<SiteMapping>>(File.OpenRead(path)) ?? throw new InvalidOperationException("No table of contents found");
         SiteMappings = siteMappings;
     }
-
     public IEnumerable<SiteMappingDto> GetTocData()
     {
         return SiteMappings.GroupBy(x => x.ChapterNumber).OrderBy(x => x.Key).Select(x =>
diff --git a/EssentialCSharp.Web/Views/Shared/_Layout.cshtml b/EssentialCSharp.Web/Views/Shared/_Layout.cshtml
index e7e63787..4f7d1198 100644
--- a/EssentialCSharp.Web/Views/Shared/_Layout.cshtml
+++ b/EssentialCSharp.Web/Views/Shared/_Layout.cshtml
@@ -121,9 +121,12 @@
                         </div>
                     </div>
 
-                    <a v-if="chapterParentPage" :href="chapterParentPage.href" class="menu-chapter-title text-light">
+                    <a v-if="chapterParentPage" :href="chapterParentPage.href" class="page-menu menu-chapter-title text-light">
                         <span v-cloak>{{chapterParentPage.title}}</span>
                     </a>
+                    <div class="page-menu menu-progress text-light" v-if="isContentPage">
+                        <span v-cloak>{{percentComplete}}%</span>
+                    </div>
 
                     <div class="d-flex align-items-center">
                         <div class="border-end pe-3 d-none d-md-block">
@@ -268,8 +271,9 @@
     <script>
         @{
             var tocData = _SiteMappings.GetTocData();
+            var percentComplete = _SiteMappings.SiteMappings.FindPercentComplete((string) ViewBag.CurrentPageKey);
         }
-
+            PERCENT_COMPLETE = @Json.Serialize(percentComplete);
             PREVIOUS_PAGE = @Json.Serialize(ViewBag.PreviousPage)
             NEXT_PAGE = @Json.Serialize(ViewBag.NextPage)
             TOC_DATA = @Json.Serialize(tocData)
@@ -320,6 +324,5 @@
         </li>
     </template>
     <script src="~/js/site.js" type="module" asp-append-version="true"></script>
-
 </body>
 </html>
diff --git a/EssentialCSharp.Web/wwwroot/css/styles.css b/EssentialCSharp.Web/wwwroot/css/styles.css
index 49fb64b7..f0b46c6c 100644
--- a/EssentialCSharp.Web/wwwroot/css/styles.css
+++ b/EssentialCSharp.Web/wwwroot/css/styles.css
@@ -224,13 +224,16 @@ a:hover {
   }
 }
 
+.page-menu {
+  white-space: nowrap;
+  overflow: hidden;
+  text-decoration: none;
+}
+
 .menu-brand {
   font-style: normal;
   font-weight: 400;
   font-size: 1.5rem;
-  text-decoration: none;
-  white-space: nowrap;
-  overflow: hidden;
   margin-left: 5px;
 }
 
@@ -238,11 +241,14 @@ a:hover {
   font-style: normal;
   font-weight: 300;
   font-size: 1.2rem;
-  text-decoration: none;
   text-overflow: ellipsis;
-  overflow: hidden;
   cursor: pointer;
-  white-space: nowrap;
+}
+
+.menu-progress {
+  font-style: normal;
+  font-weight: 200;
+  font-size: 1rem;
 }
 
 .has-tooltip {
diff --git a/EssentialCSharp.Web/wwwroot/js/site.js b/EssentialCSharp.Web/wwwroot/js/site.js
index 917d0b3e..5d57eb98 100644
--- a/EssentialCSharp.Web/wwwroot/js/site.js
+++ b/EssentialCSharp.Web/wwwroot/js/site.js
@@ -210,6 +210,8 @@ const app = createApp({
 
         const currentPage = findCurrentPage([], tocData) ?? [];
 
+        const percentComplete = ref(PERCENT_COMPLETE);
+
         const chapterParentPage = currentPage.find((parent) => parent.level === 0);
 
         const sectionTitle = ref(currentPage?.[0]?.title || "Essential C#");
@@ -277,6 +279,11 @@ const app = createApp({
             return tocData.filter(item => filterItem(item, query));
         });
 
+        const isContentPage = computed(() => {
+            let path = window.location.pathname;
+            return path !== '/home' && path !== '/guidelines' && path !== '/about' && path !== '/announcements';
+        });
+
         function filterItem(item, query) {
             let matches = normalizeString(item.title).includes(query);
             if (item.items && item.items.length) {
@@ -334,11 +341,13 @@ const app = createApp({
             tocData,
             expandedTocs,
             currentPage,
+            percentComplete,
             chapterParentPage,
 
             searchQuery,
             filteredTocData,
-            enableTocFilter
+            enableTocFilter,
+            isContentPage
         };
     },
 });