diff --git a/data/interfaces/default/js/script.js b/data/interfaces/default/js/script.js
index 2df5daeb..c04ce6ef 100644
--- a/data/interfaces/default/js/script.js
+++ b/data/interfaces/default/js/script.js
@@ -360,7 +360,8 @@ function humanDuration(ms, sig='dhm', units='ms', return_seconds=300000) {
             sig = 'dhms'
         }
 
-        ms = ms * factors[units];
+        r = factors[sig.slice(-1)];
+        ms = Math.round(ms * factors[units] / r) * r;
 
         h =  ms % factors['d'];
         d = Math.trunc(ms / factors['d']);
diff --git a/plexpy/helpers.py b/plexpy/helpers.py
index 014f1359..dfc82d25 100644
--- a/plexpy/helpers.py
+++ b/plexpy/helpers.py
@@ -272,7 +272,8 @@ def human_duration(ms, sig='dhm', units='ms', return_seconds=300000):
         if return_seconds and ms < return_seconds:
             sig = 'dhms'
 
-        ms = ms * factors[units]
+        r = factors[sig[-1]]
+        ms = round(ms * factors[units] / r) * r
 
         d, h = divmod(ms, factors['d'])
         h, m = divmod(h, factors['h'])