diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7def3e0..66e3fd6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -45,6 +45,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Added
 
+- `SpHeader::packet_len` direct method.
 - `AckFlags` which is implemented with `bitbybit::bitfield`
 - `ApidOutOfRangeError` and `SequenceCountOutOfRangeError`
 - Added PUS A legacy support for telecommands inside the `ecss.tc_pus_a` module
diff --git a/src/lib.rs b/src/lib.rs
index a622c50..c1e60ec 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -302,6 +302,7 @@ pub trait CcsdsPacket {
 
     /// Retrieve data length field
     fn data_len(&self) -> u16;
+
     /// Retrieve the total packet size based on the data length field
     #[inline]
     fn packet_len(&self) -> usize {
@@ -504,6 +505,12 @@ impl SpHeader {
         }
     }
 
+    /// Retrieve the total packet size based on the data length field
+    #[inline]
+    fn packet_len(&self) -> usize {
+        usize::from(self.data_len()) + CCSDS_HEADER_LEN + 1
+    }
+
     #[inline]
     pub fn set_seq_count(&mut self, seq_count: u14) {
         self.psc.seq_count = seq_count;