diff --git a/src/blenderbim/blenderbim/bim/module/pset/calc_quantity_function_mapper.py b/src/blenderbim/blenderbim/bim/module/pset/calc_quantity_function_mapper.py
index e02e0f8332..2d22c5ae09 100644
--- a/src/blenderbim/blenderbim/bim/module/pset/calc_quantity_function_mapper.py
+++ b/src/blenderbim/blenderbim/bim/module/pset/calc_quantity_function_mapper.py
@@ -243,14 +243,14 @@ mapper = {
         'GrossWeight' : None,
     },
     'Qto_SlabBaseQuantities' : {
-        'Width' : None,
-        'Length' : None,
-        'Depth' : "get_height",
-        'Perimeter' : None,
-        'GrossArea' : None,
-        'NetArea' : None,
-        'GrossVolume' : None,
-        'NetVolume' : None,
+        'Width' : "get_height",
+        'Length' : "get_length",
+        'Depth' : "get_width",
+        'Perimeter' : "get_gross_perimeter",
+        'GrossArea' : "get_gross_footprint_area",
+        'NetArea' : "get_net_footprint_area",
+        'GrossVolume' : "get_gross_volume",
+        'NetVolume' : "get_net_volume",
         'GrossWeight' : None,
         'NetWeight' : None,
     },
diff --git a/src/blenderbim/blenderbim/bim/module/pset/qto_calculator.py b/src/blenderbim/blenderbim/bim/module/pset/qto_calculator.py
index 4ce8272c90..2e5c6a4cad 100644
--- a/src/blenderbim/blenderbim/bim/module/pset/qto_calculator.py
+++ b/src/blenderbim/blenderbim/bim/module/pset/qto_calculator.py
@@ -69,7 +69,7 @@ class QtoCalculator:
         elif "height" in prop_name or "depth" in prop_name:
             return self.get_height(obj)
         elif "perimeter" in prop_name:
-            return self.get_perimeter(obj)
+            return self.get_net_perimeter(obj)
         elif "area" in prop_name and ("footprint" in prop_name or "section" in prop_name or "floor" in prop_name):
             return self.get_net_footprint_area(obj)
         elif "area" in prop_name and "side" in prop_name:
@@ -131,7 +131,7 @@ class QtoCalculator:
         """
         return (Vector(o.bound_box[1]) - Vector(o.bound_box[0])).length
 
-    def get_perimeter(self, o):
+    def get_net_perimeter(self, o):
         parsed_edges = []
         shared_edges = []
         perimeter = 0
@@ -146,6 +146,14 @@ class QtoCalculator:
             perimeter -= self.get_edge_key_distance(o, edge_key)
         return perimeter
 
+    def get_gross_perimeter(self, o):
+        element = tool.Ifc.get_entity(o)
+        mesh = self.get_gross_element_mesh(element)
+        gross_obj = bpy.data.objects.new("GrossObj", mesh)
+        gross_perimeter = self.get_net_perimeter(gross_obj)
+        self.delete_obj(gross_obj)
+        return gross_perimeter
+
     def get_lowest_polygons(self, o):
         lowest_polygons = []
         lowest_z = None