diff --git a/src/policy/mod.rs b/src/policy/mod.rs
index e6cdc26e..02efa58b 100644
--- a/src/policy/mod.rs
+++ b/src/policy/mod.rs
@@ -23,7 +23,8 @@
 //!
 //! These values were taken from bitcoind v0.21.1 (194b9b8792d9b0798fdb570b79fa51f1d1f5ebaf).
 
-use super::blockdata::constants::MAX_BLOCK_SIGOPS_COST;
+use super::blockdata::constants::{MAX_BLOCK_SIGOPS_COST, WITNESS_SCALE_FACTOR};
+use std::cmp;
 
 /// Maximum weight of a transaction for it to be relayed by most nodes on the network
 pub const MAX_STANDARD_TX_WEIGHT: u32 = 400_000;
@@ -52,3 +53,9 @@ pub const DEFAULT_MIN_RELAY_TX_FEE: u32 = 1_000;
 /// Default number of hours for an unconfirmed transaction to expire in most of the network nodes'
 /// mempools.
 pub const DEFAULT_MEMPOOL_EXPIRY: u32 = 336;
+
+/// The virtual transaction size, as computed by default by bitcoind node.
+pub fn get_virtual_tx_size(weight: i64, n_sigops: i64) -> i64 {
+    (cmp::max(weight, n_sigops * DEFAULT_BYTES_PER_SIGOP as i64) + WITNESS_SCALE_FACTOR as i64 - 1)
+        / WITNESS_SCALE_FACTOR as i64
+}