diff --git a/apps/openmw/mwclass/npc.cpp b/apps/openmw/mwclass/npc.cpp
index f7172ac0b9..b8b1e9600d 100644
--- a/apps/openmw/mwclass/npc.cpp
+++ b/apps/openmw/mwclass/npc.cpp
@@ -1148,16 +1148,7 @@ namespace MWClass
                 const bool hasHealth = it->getClass().hasItemHealth(*it);
                 if (hasHealth)
                 {
-                    int armorMaxHealth = it->getClass().getItemMaxHealth(*it);
-                    if (armorMaxHealth == 0)
-                    {
-                        ratings[i] = 0;
-                    }
-                    else
-                    {
-                        int armorHealth = it->getClass().getItemHealth(*it);
-                        ratings[i] *= (float(armorHealth) / armorMaxHealth);
-                    }
+                    ratings[i] *= it->getClass().getItemNormalizedHealth(*it);
                 }
             }
         }
diff --git a/apps/openmw/mwgui/tradewindow.cpp b/apps/openmw/mwgui/tradewindow.cpp
index 2fd91fd4a0..ce8193da25 100644
--- a/apps/openmw/mwgui/tradewindow.cpp
+++ b/apps/openmw/mwgui/tradewindow.cpp
@@ -34,17 +34,8 @@ namespace
     {
         float price = static_cast<float>(item.getClass().getValue(item));
         if (item.getClass().hasItemHealth(item))
-        {
-            if (item.getClass().getItemMaxHealth(item) == 0)
-            {
-                price = 0;
-            }
-            else
-            {
-                price *= item.getClass().getItemHealth(item);
-                price /= item.getClass().getItemMaxHealth(item);
-            }
-        }
+            price *= item.getClass().getItemNormalizedHealth(item);
+
         return static_cast<int>(price * count);
     }
 
diff --git a/apps/openmw/mwgui/windowmanagerimp.cpp b/apps/openmw/mwgui/windowmanagerimp.cpp
index 3b26edecb8..27ea534a74 100644
--- a/apps/openmw/mwgui/windowmanagerimp.cpp
+++ b/apps/openmw/mwgui/windowmanagerimp.cpp
@@ -1400,17 +1400,9 @@ namespace MWGui
         int durabilityPercent = 100;
         if (item.getClass().hasItemHealth(item))
         {
-            int weapmaxhealth = item.getClass().getItemMaxHealth(item);
-            if (weapmaxhealth == 0)
-            {
-                durabilityPercent = 0;
-            }
-            else
-            {
-                int weaphealth = item.getClass().getItemHealth(item);
-                durabilityPercent = static_cast<int>(weaphealth / static_cast<float>(weapmaxhealth) * 100);
-            }
+            durabilityPercent = static_cast<int>(item.getClass().getItemNormalizedHealth(item));
         }
+
         mHud->setSelectedWeapon(item, durabilityPercent);
         mInventoryWindow->setTitle(item.getClass().getName(item));
     }
diff --git a/apps/openmw/mwmechanics/combat.cpp b/apps/openmw/mwmechanics/combat.cpp
index 2a9ff5e84f..41e2485ce0 100644
--- a/apps/openmw/mwmechanics/combat.cpp
+++ b/apps/openmw/mwmechanics/combat.cpp
@@ -373,16 +373,7 @@ namespace MWMechanics
         const bool weaphashealth = weapon.getClass().hasItemHealth(weapon);
         if (weaphashealth)
         {
-            int weapmaxhealth = weapon.getClass().getItemMaxHealth(weapon);
-
-            if (weapmaxhealth == 0)
-            {
-                damage = 0;
-                return;
-            }
-
-            int weaphealth = weapon.getClass().getItemHealth(weapon);
-            damage *= (float(weaphealth) / weapmaxhealth);
+            damage *= weapon.getClass().getItemNormalizedHealth(weapon);
         }
 
         static const float fDamageStrengthBase = MWBase::Environment::get().getWorld()->getStore().get<ESM::GameSetting>()
diff --git a/apps/openmw/mwworld/class.cpp b/apps/openmw/mwworld/class.cpp
index 68d5998ac9..70fde33cfb 100644
--- a/apps/openmw/mwworld/class.cpp
+++ b/apps/openmw/mwworld/class.cpp
@@ -83,6 +83,18 @@ namespace MWWorld
             return ptr.getCellRef().getCharge();
     }
 
+    float Class::getItemNormalizedHealth (const ConstPtr& ptr) const
+    {
+        if (getItemMaxHealth(ptr) == 0)
+        {
+            return 0.f;
+        }
+        else
+        {
+            return getItemHealth(ptr) / static_cast<float>(getItemMaxHealth(ptr));
+        }
+    }
+
     int Class::getItemMaxHealth (const ConstPtr& ptr) const
     {
         throw std::runtime_error ("class does not have item health");
diff --git a/apps/openmw/mwworld/class.hpp b/apps/openmw/mwworld/class.hpp
index 132b7e9e87..af88b0dcca 100644
--- a/apps/openmw/mwworld/class.hpp
+++ b/apps/openmw/mwworld/class.hpp
@@ -112,6 +112,9 @@ namespace MWWorld
             virtual int getItemHealth (const ConstPtr& ptr) const;
             ///< Return current item health or throw an exception if class does not have item health
 
+            virtual float getItemNormalizedHealth (const ConstPtr& ptr) const;
+            ///< Return current item health re-scaled to maximum health
+
             virtual int getItemMaxHealth (const ConstPtr& ptr) const;
             ///< Return item max health or throw an exception, if class does not have item health
             /// (default implementation: throw an exception)