It started on work with commands then I got carried away.

worldedit-core/src/main/java/com/sk89q/worldedit/regions/AbstractRegion.java

@@ -106,6 +106,20 @@ public abstract class AbstractRegion extends AbstractSet<BlockVector3> implement
         return points;
     }
 
+    /**
+     * Get the number of blocks in the region.
+     *
+     * @return number of blocks
+     */
+    @Override
+    public int getArea() {
+        BlockVector3 min = getMinimumPoint();
+        BlockVector3 max = getMaximumPoint();
+
+        return (max.getX() - min.getX() + 1) *
+                (max.getY() - min.getY() + 1) *
+                (max.getZ() - min.getZ() + 1);
+    }
     /**
      * Get X-size.
      *