diff --git a/src/Dodge/Item/SlotsTaken.hs b/src/Dodge/Item/SlotsTaken.hs
new file mode 100644
index 000000000..d4d9afa0c
--- /dev/null
+++ b/src/Dodge/Item/SlotsTaken.hs
@@ -0,0 +1,12 @@
+module Dodge.Item.SlotsTaken (
+    itSlotsTaken,
+) where
+
+import Control.Lens
+import Dodge.Data.Item
+import Dodge.Module
+
+itSlotsTaken :: Item -> Int
+itSlotsTaken it = case it ^? itUse . useAmount of
+    Nothing -> moduleSizes it + ceiling (_itInvSize it)
+    Just i -> moduleSizes it + ceiling (_itInvSize it * fromIntegral i)