diff --git a/NuWeather/formatter.py b/NuWeather/formatter.py
index 713a258..c018f06 100644
--- a/NuWeather/formatter.py
+++ b/NuWeather/formatter.py
@@ -186,9 +186,9 @@ def format_distance(mi=None, km=None, speed=False):
         return '0'  # Don't bother with multiple units if the value is 0
 
     if mi is None:
-        mi = km / 1.609
+        mi = km / 1.609344
     elif km is None:
-        km = mi * 1.609
+        km = mi * 1.609344
 
     if speed:
         m = f'{round(km / 3.6, 1)}m/s'
diff --git a/NuWeather/test.py b/NuWeather/test.py
index 6a079be..97dc0c3 100644
--- a/NuWeather/test.py
+++ b/NuWeather/test.py
@@ -121,7 +121,7 @@ class NuWeatherFormatterTestCase(unittest.TestCase):
     def test_format_distance_displaymode(self):
         func = formatter.format_distance
         with conf.supybot.plugins.NuWeather.units.distance.context('$mi / $km / $m'):
-            self.assertEqual(func(mi=123), '123mi / 197.9km / 197900.0m')
+            self.assertEqual(func(mi=123), '123mi / 197.9km / 197949.3m')
             self.assertEqual(func(km=42.6), '26.5mi / 42.6km / 42600.0m')
         with conf.supybot.plugins.NuWeather.units.distance.context('$m/$km'):
             self.assertEqual(func(km=2), '2000m/2km')