diff --git a/src/Transaction/TransactionBuilder.php b/src/Transaction/TransactionBuilder.php
index <HASH>..<HASH> 100755
--- a/src/Transaction/TransactionBuilder.php
+++ b/src/Transaction/TransactionBuilder.php
@@ -223,8 +223,8 @@ class TransactionBuilder implements XdrEncodableInterface
 
     public function getFee()
     {
-        // todo: calculate real fee
-        return 100;
+        // todo: load base fee from network
+        return 100 * $this->operations->count();
     }
 
     /**
TransactionBuilder - fee is now calculated correctly for transactions with mutiple options