diff --git a/src/utils/fees.rs b/src/utils/fees.rs
index fdf93ef..616a73c 100644
--- a/src/utils/fees.rs
+++ b/src/utils/fees.rs
@@ -91,6 +91,11 @@ pub fn estimate_transaction_fees(
     current_fee_rate.fee_vb(vbytes as u64).unwrap()
 }
 
+pub fn calculate_transaction_fees(transaction: &Transaction, current_fee_rate: FeeRate) -> Amount {
+    let vbytes = transaction.vsize();
+    current_fee_rate.fee_vb(vbytes as u64).unwrap()
+}
+
 fn estimate_vbytes(
     inputs: usize,
     script_type: ScriptType,
diff --git a/src/wallet/builder/rune.rs b/src/wallet/builder/rune.rs
index 62bf2c2..541513f 100644
--- a/src/wallet/builder/rune.rs
+++ b/src/wallet/builder/rune.rs
@@ -3,9 +3,8 @@ use bitcoin::transaction::Version;
 use bitcoin::{Address, Amount, FeeRate, ScriptBuf, Transaction, TxIn, TxOut};
 use ordinals::{Edict, Etching, RuneId, Runestone as OrdRunestone};
 
-use crate::fees::estimate_transaction_fees;
+use crate::fees::calculate_transaction_fees;
 use crate::wallet::builder::TxInputInfo;
-use crate::wallet::ScriptType;
 use crate::{OrdError, OrdTransactionBuilder};
 
 /// Postage amount for rune transaction.
@@ -129,13 +128,7 @@ impl OrdTransactionBuilder {
             output: outputs,
         };
 
-        let fee_amount = estimate_transaction_fees(
-            ScriptType::P2TR,
-            unsigned_tx.input.len(),
-            args.fee_rate,
-            &None,
-            unsigned_tx.output.clone(),
-        );
+        let fee_amount = calculate_transaction_fees(&unsigned_tx, args.fee_rate);
         let change_amount = args
             .input_amount()
             .checked_sub(fee_amount + RUNE_POSTAGE * 2)
@@ -161,7 +154,7 @@ mod tests {
     use bitcoin::{Network, OutPoint, PrivateKey, PublicKey, Txid};
 
     use super::*;
-    use crate::wallet::LocalSigner;
+    use crate::wallet::{LocalSigner, ScriptType};
     use crate::Wallet;
 
     #[tokio::test]