diff --git a/website/build.py b/website/build.py
index e2040f07..e030da37 100644
--- a/website/build.py
+++ b/website/build.py
@@ -92,6 +92,14 @@ def category_public_url(category: ParsedSection) -> str:
     return f"{SITE_URL}categories/{category['slug']}/"
 
 
+def subcategory_path(category_slug: str, subcategory_slug: str) -> str:
+    return f"/categories/{category_slug}/{subcategory_slug}/"
+
+
+def subcategory_public_url(category_slug: str, subcategory_slug: str) -> str:
+    return f"{SITE_URL}categories/{category_slug}/{subcategory_slug}/"
+
+
 def write_sitemap_xml(path: Path, urls: Sequence[tuple[str, str]]) -> None:
     ET.register_namespace("", SITEMAP_NS)
     urlset = ET.Element(f"{{{SITEMAP_NS}}}urlset")
diff --git a/website/tests/test_build.py b/website/tests/test_build.py
index 1e52115c..0f666fb4 100644
--- a/website/tests/test_build.py
+++ b/website/tests/test_build.py
@@ -16,6 +16,7 @@ from build import (
     extract_github_repo,
     load_stars,
     sort_entries,
+    subcategory_path,
 )
 from readme_parser import parse_readme, slugify
 
@@ -81,6 +82,14 @@ class TestSlugify:
         assert slugify("  Date  and  Time  ") == "date-and-time"
 
 
+class TestSubcategoryPath:
+    def test_builds_path(self):
+        assert subcategory_path("web-frameworks", "synchronous") == "/categories/web-frameworks/synchronous/"
+
+    def test_trailing_slash(self):
+        assert subcategory_path("a", "b").endswith("/")
+
+
 # ---------------------------------------------------------------------------
 # build (integration)
 # ---------------------------------------------------------------------------