diff --git a/include/consthash/cityhash128.hxx b/include/consthash/cityhash128.hxx
index 0ee9ebe..026ac7c 100644
--- a/include/consthash/cityhash128.hxx
+++ b/include/consthash/cityhash128.hxx
@@ -199,6 +199,10 @@ constexpr uint128_t city128(const char *s, size_t len) {
     return __detail::CityHash128(s, len);
 }
 
+constexpr uint128_t city128(const char *s) {
+	return __detail::CityHash128(s, __detail::str_len(s));
+}
+
 constexpr uint128_t city128_seed(const char *s, size_t len, uint128_t seed) {
     return __detail::CityHash128WithSeed(s, len, seed);
 }
diff --git a/include/consthash/cityhash32.hxx b/include/consthash/cityhash32.hxx
index 195fdab..4968386 100644
--- a/include/consthash/cityhash32.hxx
+++ b/include/consthash/cityhash32.hxx
@@ -93,6 +93,10 @@ constexpr uint32_t city32(const char* s, size_t len) {
     return __detail::city32impl(s, len);
 }
 
+constexpr uint32_t city32(const char* s) {
+	return __detail::city32impl(s, __detail::str_len(s));
+}
+
 CONSTHASH_NAMESPACE_END;
 
 #endif // _CONSTHASH_CITYHASH32_HXX
diff --git a/include/consthash/cityhash64.hxx b/include/consthash/cityhash64.hxx
index e3b15f5..bc6af97 100644
--- a/include/consthash/cityhash64.hxx
+++ b/include/consthash/cityhash64.hxx
@@ -69,6 +69,11 @@ constexpr uint64_t city64(const char *buf, size_t len)
     return __detail::city64impl(buf, len);
 }
 
+constexpr uint64_t city64(const char *buf)
+{
+	return __detail::city64impl(buf, __detail::str_len(buf));
+}
+
 // Hash function for a byte array.  For convenience, a 64-bit seed is also
 // hashed into the result.
 constexpr uint64_t city64_seed(const char *buf, size_t len, uint64_t seed)
diff --git a/include/consthash/common.hxx b/include/consthash/common.hxx
index 4e125fb..21f6376 100644
--- a/include/consthash/common.hxx
+++ b/include/consthash/common.hxx
@@ -24,6 +24,11 @@ struct ensure
     static constexpr void ct() { }
 };
 
+constexpr size_t str_len(const char* const str)
+{
+	return *str ? (1 + str_len(str + 1)) : 0;
+}
+
 }; // namespace __detail
 
 CONSTHASH_NAMESPACE_END;
diff --git a/include/consthash/crc32.hxx b/include/consthash/crc32.hxx
index a1ffd13..120bd69 100644
--- a/include/consthash/crc32.hxx
+++ b/include/consthash/crc32.hxx
@@ -67,6 +67,11 @@ constexpr uint32_t crc32(const char* str, size_t size)
     return crc32impl(0xffffffff, str, size) ^ 0xffffffff;
 }
 
+constexpr uint32_t crc32(const char* str)
+{
+	return crc32impl(0xffffffff, str, __detail::str_len(str)) ^ 0xffffffff;
+}
+
 CONSTHASH_NAMESPACE_END;
 
 #endif // _CONSTHASH_CRC32_HXX
diff --git a/include/consthash/crc64.hxx b/include/consthash/crc64.hxx
index f0c8fb0..18fb475 100644
--- a/include/consthash/crc64.hxx
+++ b/include/consthash/crc64.hxx
@@ -88,6 +88,11 @@ constexpr uint64_t crc64(const char* str, size_t size)
     return crc64impl(0xffffffff, str, size) ^ 0xffffffff;
 }
 
+constexpr uint64_t crc64(const char* str)
+{
+	return crc64impl(0xffffffff, str, __detail::str_len(str)) ^ 0xffffffff;
+}
+
 CONSTHASH_NAMESPACE_END;
 
 #endif // _CONSTHASH_CRC64_HXX