diff --git a/io_scene_3ds/export_3ds.py b/io_scene_3ds/export_3ds.py
index 3cced15fa..73b5339ed 100644
--- a/io_scene_3ds/export_3ds.py
+++ b/io_scene_3ds/export_3ds.py
@@ -1541,12 +1541,18 @@ def save(operator, context, filepath="", scale_factor=1.0, use_scene_unit=False,
     unit_measure = 1.0
     if use_scene_unit:
         unit_length = scene.unit_settings.length_unit
-        if unit_length == 'KILOMETERS':
+        if unit_length == 'MILES':
+            unit_measure = 0.000621371
+        elif unit_length == 'KILOMETERS':
             unit_measure = 0.001
+        elif unit_length == 'INCHES':
+            unit_measure = 39.37007874
         elif unit_length == 'CENTIMETERS':
             unit_measure = 100
         elif unit_length == 'MILLIMETERS':
             unit_measure = 1000
+        elif unit_length == 'THOU':
+            unit_measure = 39370.07874
         elif unit_length == 'MICROMETERS':
             unit_measure = 1000000
 
diff --git a/io_scene_3ds/import_3ds.py b/io_scene_3ds/import_3ds.py
index 2cce3b0c7..e9b640ed4 100644
--- a/io_scene_3ds/import_3ds.py
+++ b/io_scene_3ds/import_3ds.py
@@ -1475,12 +1475,18 @@ def load_3ds(filepath, context, CONSTRAIN=10.0, UNITS=False, IMAGE_SEARCH=True,
 
     if UNITS:
         unit_length = scn.unit_settings.length_unit
-        if unit_length == 'KILOMETERS':
+        if unit_length == 'MILES':
+            MEASURE = 1609.344
+        elif unit_length == 'KILOMETERS':
             MEASURE = 1000.0
+        elif unit_length == 'INCHES':
+            MEASURE = 0.3048
         elif unit_length == 'CENTIMETERS':
             MEASURE = 0.01
         elif unit_length == 'MILLIMETERS':
             MEASURE = 0.001
+        elif unit_length == 'THOU':
+            MEASURE = 0.0000254
         elif unit_length == 'MICROMETERS':
             MEASURE = 0.000001