diff --git a/.changeset/mighty-news-try.md b/.changeset/mighty-news-try.md
new file mode 100644
index 00000000..766fc0d6
--- /dev/null
+++ b/.changeset/mighty-news-try.md
@@ -0,0 +1,5 @@
+---
+"@blaze-cardano/tx": patch
+---
+
+Small fee calculation fix
diff --git a/packages/blaze-tx/src/tx.ts b/packages/blaze-tx/src/tx.ts
index 0810df8e..b6eac40e 100644
--- a/packages/blaze-tx/src/tx.ts
+++ b/packages/blaze-tx/src/tx.ts
@@ -1620,7 +1620,7 @@ export class TxBuilder {
         "A transaction was built using fee padding. This is useful for working around changes to fee calculation, but ultimately is a bandaid. If you find yourself needing this, please open a ticket at https://github.com/butaneprotocol/blaze-cardano so we can fix the underlying inaccuracy!",
       );
     }
-    let final_size = draft_tx.toCbor().length / 2;
+    let final_size = draft_size;
     do {
       const oldEvaluationFee = evaluationFee;
       this.fee += BigInt(