diff --git a/AK/Utf16View.cpp b/AK/Utf16View.cpp
index 4150f57ed7e..8d753fe5511 100644
--- a/AK/Utf16View.cpp
+++ b/AK/Utf16View.cpp
@@ -63,6 +63,13 @@ ErrorOr<void> code_point_to_utf16(Utf16Data& string, u32 code_point)
     return {};
 }
 
+size_t utf16_code_unit_length_from_utf8(StringView string)
+{
+    // FIXME: This is inefficient!
+    auto utf16_data = MUST(AK::utf8_to_utf16(string));
+    return Utf16View { utf16_data }.length_in_code_units();
+}
+
 bool Utf16View::is_high_surrogate(u16 code_unit)
 {
     return (code_unit >= high_surrogate_min) && (code_unit <= high_surrogate_max);
diff --git a/AK/Utf16View.h b/AK/Utf16View.h
index 678d55e5d9f..254c1ac0294 100644
--- a/AK/Utf16View.h
+++ b/AK/Utf16View.h
@@ -25,6 +25,8 @@ ErrorOr<Utf16Data> utf8_to_utf16(Utf8View const&);
 ErrorOr<Utf16Data> utf32_to_utf16(Utf32View const&);
 ErrorOr<void> code_point_to_utf16(Utf16Data&, u32);
 
+size_t utf16_code_unit_length_from_utf8(StringView);
+
 class Utf16View;
 
 class Utf16CodePointIterator {
diff --git a/Tests/AK/TestUtf16.cpp b/Tests/AK/TestUtf16.cpp
index fef4082818e..e9c10c45cf3 100644
--- a/Tests/AK/TestUtf16.cpp
+++ b/Tests/AK/TestUtf16.cpp
@@ -89,6 +89,14 @@ TEST_CASE(decode_utf16)
     EXPECT_EQ(i, expected.size());
 }
 
+TEST_CASE(utf16_code_unit_length_from_utf8)
+{
+    EXPECT_EQ(AK::utf16_code_unit_length_from_utf8(""sv), 0uz);
+    EXPECT_EQ(AK::utf16_code_unit_length_from_utf8("abc"sv), 3uz);
+    EXPECT_EQ(AK::utf16_code_unit_length_from_utf8("😀"sv), 2uz);
+    EXPECT_EQ(AK::utf16_code_unit_length_from_utf8("Привет, мир! 😀 γειά σου κόσμος こんにちは世界"sv), 39uz);
+}
+
 TEST_CASE(utf16_literal)
 {
     {