diff --git a/src/core/uritemplate/include/sourcemeta/core/uritemplate_router.h b/src/core/uritemplate/include/sourcemeta/core/uritemplate_router.h
index d2a3a43c1..255c46618 100644
--- a/src/core/uritemplate/include/sourcemeta/core/uritemplate_router.h
+++ b/src/core/uritemplate/include/sourcemeta/core/uritemplate_router.h
@@ -106,10 +106,14 @@ class SOURCEMETA_CORE_URITEMPLATE_EXPORT URITemplateRouter {
   /// Access the base path prefix
   [[nodiscard]] auto base_path() const noexcept -> std::string_view;
 
+  /// Get the number of registered routes
+  [[nodiscard]] auto size() const noexcept -> std::size_t;
+
 private:
   Node root_;
   std::string base_path_;
   std::vector<std::pair<Identifier, std::vector<Argument>>> arguments_;
+  std::size_t size_{0};
 };
 
 /// @ingroup uritemplate
@@ -145,6 +149,9 @@ class SOURCEMETA_CORE_URITEMPLATE_EXPORT URITemplateRouterView {
   /// Access the base path prefix
   [[nodiscard]] auto base_path() const noexcept -> std::string_view;
 
+  /// Get the number of registered routes
+  [[nodiscard]] auto size() const noexcept -> std::size_t;
+
 private:
   std::vector<std::uint8_t> data_;
 };
diff --git a/src/core/uritemplate/uritemplate_router.cc b/src/core/uritemplate/uritemplate_router.cc
index a8700aa14..e5020b0f3 100644
--- a/src/core/uritemplate/uritemplate_router.cc
+++ b/src/core/uritemplate/uritemplate_router.cc
@@ -109,6 +109,10 @@ auto URITemplateRouter::base_path() const noexcept -> std::string_view {
   return this->base_path_;
 }
 
+auto URITemplateRouter::size() const noexcept -> std::size_t {
+  return this->size_;
+}
+
 auto URITemplateRouter::add(const std::string_view uri_template,
                             const Identifier identifier,
                             const Identifier context,
@@ -141,6 +145,9 @@ auto URITemplateRouter::add(const std::string_view uri_template,
 
   if (uri_template.empty()) {
     auto &target = current ? *current : this->root_;
+    if (target.identifier == 0) {
+      this->size_ += 1;
+    }
     target.identifier = identifier;
     target.context = context;
     if (!arguments.empty()) {
@@ -310,6 +317,9 @@ auto URITemplateRouter::add(const std::string_view uri_template,
   }
 
   if (!absorbed && current != nullptr) {
+    if (current->identifier == 0) {
+      this->size_ += 1;
+    }
     current->identifier = identifier;
     current->context = context;
     if (!arguments.empty()) {
diff --git a/src/core/uritemplate/uritemplate_router_view.cc b/src/core/uritemplate/uritemplate_router_view.cc
index 53b020f1d..80bfa1ea1 100644
--- a/src/core/uritemplate/uritemplate_router_view.cc
+++ b/src/core/uritemplate/uritemplate_router_view.cc
@@ -663,4 +663,34 @@ auto URITemplateRouterView::base_path() const noexcept -> std::string_view {
   return {string_table + header->base_path_offset, header->base_path_length};
 }
 
+auto URITemplateRouterView::size() const noexcept -> std::size_t {
+  if (this->data_.size() < sizeof(RouterHeader)) {
+    return 0;
+  }
+
+  const auto *header =
+      reinterpret_cast<const RouterHeader *>(this->data_.data());
+  if (header->magic != ROUTER_MAGIC || header->version != ROUTER_VERSION) {
+    return 0;
+  }
+
+  if (header->node_count == 0 ||
+      header->node_count > (this->data_.size() - sizeof(RouterHeader)) /
+                               sizeof(SerializedNode)) {
+    return 0;
+  }
+
+  const auto *nodes = reinterpret_cast<const SerializedNode *>(
+      this->data_.data() + sizeof(RouterHeader));
+
+  std::size_t count = 0;
+  for (std::uint32_t index = 0; index < header->node_count; ++index) {
+    if (nodes[index].identifier != 0) {
+      count += 1;
+    }
+  }
+
+  return count;
+}
+
 } // namespace sourcemeta::core
diff --git a/test/uritemplate/uritemplate_router_test.cc b/test/uritemplate/uritemplate_router_test.cc
index fd0f05c18..b5d85b98e 100644
--- a/test/uritemplate/uritemplate_router_test.cc
+++ b/test/uritemplate/uritemplate_router_test.cc
@@ -1292,3 +1292,50 @@ TEST(URITemplateRouter, add_with_context_overwrites_previous_context) {
   EXPECT_ROUTER_MATCH(router, "/users", 1, 20, captures);
   EXPECT_EQ(captures.size(), 0);
 }
+
+TEST(URITemplateRouter, size_empty_router) {
+  const sourcemeta::core::URITemplateRouter router;
+  EXPECT_EQ(router.size(), 0);
+}
+
+TEST(URITemplateRouter, size_single_route) {
+  sourcemeta::core::URITemplateRouter router;
+  router.add("/users", 1);
+  EXPECT_EQ(router.size(), 1);
+}
+
+TEST(URITemplateRouter, size_multiple_routes) {
+  sourcemeta::core::URITemplateRouter router;
+  router.add("/users", 1);
+  router.add("/users/{id}", 2);
+  router.add("/posts", 3);
+  router.add("/posts/{id}", 4);
+  EXPECT_EQ(router.size(), 4);
+}
+
+TEST(URITemplateRouter, size_duplicate_route_does_not_increase) {
+  sourcemeta::core::URITemplateRouter router;
+  router.add("/users", 1);
+  router.add("/users", 2);
+  EXPECT_EQ(router.size(), 1);
+}
+
+TEST(URITemplateRouter, size_with_context_overwrite_does_not_increase) {
+  sourcemeta::core::URITemplateRouter router;
+  router.add("/users", 1, 10);
+  router.add("/users", 1, 20);
+  EXPECT_EQ(router.size(), 1);
+}
+
+TEST(URITemplateRouter, size_root_template) {
+  sourcemeta::core::URITemplateRouter router;
+  router.add("", 1);
+  EXPECT_EQ(router.size(), 1);
+}
+
+TEST(URITemplateRouter, size_with_base_path) {
+  sourcemeta::core::URITemplateRouter router{"/v1"};
+  router.add("/users", 1);
+  router.add("/posts", 2);
+  EXPECT_EQ(router.size(), 2);
+}
diff --git a/test/uritemplate/uritemplate_router_view_test.cc b/test/uritemplate/uritemplate_router_view_test.cc
index c725b1817..da9d101d5 100644
--- a/test/uritemplate/uritemplate_router_view_test.cc
+++ b/test/uritemplate/uritemplate_router_view_test.cc
@@ -2318,3 +2318,62 @@ TEST_F(URITemplateRouterViewTest,
   EXPECT_ROUTER_MATCH(restored, "/users", 1, 20, captures);
   EXPECT_EQ(captures.size(), 0);
 }
+
+TEST_F(URITemplateRouterViewTest, size_empty_router) {
+  {
+    const sourcemeta::core::URITemplateRouter router;
+    sourcemeta::core::URITemplateRouterView::save(router, this->path);
+  }
+
+  const sourcemeta::core::URITemplateRouterView restored{this->path};
+  EXPECT_EQ(restored.size(), 0);
+}
+
+TEST_F(URITemplateRouterViewTest, size_single_route) {
+  {
+    sourcemeta::core::URITemplateRouter router;
+    router.add("/users", 1);
+    sourcemeta::core::URITemplateRouterView::save(router, this->path);
+  }
+
+  const sourcemeta::core::URITemplateRouterView restored{this->path};
+  EXPECT_EQ(restored.size(), 1);
+}
+
+TEST_F(URITemplateRouterViewTest, size_multiple_routes) {
+  {
+    sourcemeta::core::URITemplateRouter router;
+    router.add("/users", 1);
+    router.add("/users/{id}", 2);
+    router.add("/posts", 3);
+    router.add("/posts/{id}", 4);
+    sourcemeta::core::URITemplateRouterView::save(router, this->path);
+  }
+
+  const sourcemeta::core::URITemplateRouterView restored{this->path};
+  EXPECT_EQ(restored.size(), 4);
+}
+
+TEST_F(URITemplateRouterViewTest, size_duplicate_route_does_not_increase) {
+  {
+    sourcemeta::core::URITemplateRouter router;
+    router.add("/users", 1);
+    router.add("/users", 2);
+    sourcemeta::core::URITemplateRouterView::save(router, this->path);
+  }
+
+  const sourcemeta::core::URITemplateRouterView restored{this->path};
+  EXPECT_EQ(restored.size(), 1);
+}
+
+TEST_F(URITemplateRouterViewTest, size_with_base_path) {
+  {
+    sourcemeta::core::URITemplateRouter router{"/v1"};
+    router.add("/users", 1);
+    router.add("/posts", 2);
+    sourcemeta::core::URITemplateRouterView::save(router, this->path);
+  }
+
+  const sourcemeta::core::URITemplateRouterView restored{this->path};
+  EXPECT_EQ(restored.size(), 2);
+}