diff --git a/src/main/kotlin/DropTableEditor.kt b/src/main/kotlin/DropTableEditor.kt
index b71de87..1e015c2 100644
--- a/src/main/kotlin/DropTableEditor.kt
+++ b/src/main/kotlin/DropTableEditor.kt
@@ -201,6 +201,7 @@ class DropTableEditor(val table: NPCDropTable) : JFrame("Editing ${if(table.ids.
         mainModel.addColumn("Max Amt")
         mainModel.addColumn("Weight")
         mainModel.addColumn("(%)")
+        mainModel.addColumn("(1/%)")
 
         defaultModel.addColumn("ID")
         defaultModel.addColumn("Name")
@@ -312,6 +313,7 @@ class DropTableEditor(val table: NPCDropTable) : JFrame("Editing ${if(table.ids.
         fun getPercentage(weight: Double, table: WeightBasedTable): String{
             return "${round((weight / table.totalWeight) * 100.0,4)}%"
         }
+
         fun round(value: Double, places: Int): Double {
             require(places >= 0)
             var bd: BigDecimal = BigDecimal.valueOf(value)
@@ -328,7 +330,7 @@ class DropTableEditor(val table: NPCDropTable) : JFrame("Editing ${if(table.ids.
             charmModel.addRow(arrayOf(item.id,TableData.getItemName(item.id),item.minAmt,item.maxAmt,item.weight,getPercentage(item.weight,table.charmTable)))
         }
         for(item in table){
-            mainModel.addRow(arrayOf(item.id,TableData.getItemName(item.id),item.minAmt,item.maxAmt,item.weight,getPercentage(item.weight,table)))
+            mainModel.addRow(arrayOf(item.id,TableData.getItemName(item.id),item.minAmt,item.maxAmt,item.weight,getPercentage(item.weight,table),getInversePercentage(item.weight, table)))
         }
         isVisible = true
     }
@@ -337,6 +339,10 @@ class DropTableEditor(val table: NPCDropTable) : JFrame("Editing ${if(table.ids.
         return "${round((weight / table.totalWeight) * 100.0,2)}%"
     }
 
+    fun getInversePercentage(weight: Double, table: WeightBasedTable): String {
+        return "${1.0/(weight / table.totalWeight)}"
+    }
+
     fun updateCharmPercentages(){
         for(i in 0 until charmModel.rowCount){
             charmModel.setValueAt(getPercentage(table.charmTable[i].weight,table.charmTable),i,5)
@@ -346,6 +352,7 @@ class DropTableEditor(val table: NPCDropTable) : JFrame("Editing ${if(table.ids.
     fun updateMainPercentages(){
         for(i in 0 until mainModel.rowCount){
             mainModel.setValueAt(getPercentage(table[i].weight,table),i,5)
+            mainModel.setValueAt(getInversePercentage(table[i].weight,table),i,6)
         }
     }
 
@@ -355,4 +362,4 @@ class DropTableEditor(val table: NPCDropTable) : JFrame("Editing ${if(table.ids.
         bd = bd.setScale(places, RoundingMode.HALF_UP)
         return bd.toDouble()
     }
-}
\ No newline at end of file
+}