diff --git a/src/unitpy/definitions/unit_NIST.py b/src/unitpy/definitions/unit_NIST.py
index 038cd75..056a52c 100644
--- a/src/unitpy/definitions/unit_NIST.py
+++ b/src/unitpy/definitions/unit_NIST.py
@@ -434,7 +434,7 @@
             "additional_labels": ["fahrenheit"]
         },
         "Rankine": {
-            "multiplier": 1.8,
+            "multiplier": 5/9,
             "abbr": "degR",
             "additional_labels": ["rankine"]
         }
diff --git a/tests/test_unit_conversion.py b/tests/test_unit_conversion.py
index 34c5b7a..139ca05 100644
--- a/tests/test_unit_conversion.py
+++ b/tests/test_unit_conversion.py
@@ -38,6 +38,9 @@
     ("50 degF", "10 degC"),
     ("0 K", "-273.15 degC"),
     ("-459.67 degF", "0 K"),
+    ("0 K", "0 degR"),
+    ("1 K", "1.8 degR"),
+    ("273.15 K", "491.67 degR"),
 
 )