diff --git a/eras/allegra/impl/src/Cardano/Ledger/Allegra/Tx.hs b/eras/allegra/impl/src/Cardano/Ledger/Allegra/Tx.hs
index 23da633d776..229659c27c2 100644
--- a/eras/allegra/impl/src/Cardano/Ledger/Allegra/Tx.hs
+++ b/eras/allegra/impl/src/Cardano/Ledger/Allegra/Tx.hs
@@ -33,6 +33,7 @@ import Cardano.Ledger.Shelley.Tx (
   mkBasicShelleyTx,
   shelleyMinFeeTx,
   sizeShelleyTxF,
+  wireSizeShelleyTxF,
   witsShelleyTxL,
  )
 import qualified Data.Set as Set (map)
@@ -59,6 +60,9 @@ instance Crypto c => EraTx (AllegraEra c) where
   sizeTxF = sizeShelleyTxF
   {-# INLINE sizeTxF #-}
 
+  wireSizeTxF = wireSizeShelleyTxF
+  {-# INLINE wireSizeTxF #-}
+
   validateNativeScript = validateTimelock
   {-# INLINE validateNativeScript #-}
 
diff --git a/eras/alonzo/impl/CHANGELOG.md b/eras/alonzo/impl/CHANGELOG.md
index 14735c39f9d..e35331f5ee3 100644
--- a/eras/alonzo/impl/CHANGELOG.md
+++ b/eras/alonzo/impl/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## 1.10.1.0
 
+* Added `wireSizeAlonzoTxF`
+
 ### `testlib`
 
 * Export `fixupRedeemerIndices` from `Alonzo.ImpTest`
diff --git a/eras/alonzo/impl/src/Cardano/Ledger/Alonzo/Tx.hs b/eras/alonzo/impl/src/Cardano/Ledger/Alonzo/Tx.hs
index 52ea88c6c00..6dd7f58fc4f 100644
--- a/eras/alonzo/impl/src/Cardano/Ledger/Alonzo/Tx.hs
+++ b/eras/alonzo/impl/src/Cardano/Ledger/Alonzo/Tx.hs
@@ -49,6 +49,7 @@ module Cardano.Ledger.Alonzo.Tx (
   witsAlonzoTxL,
   auxDataAlonzoTxL,
   sizeAlonzoTxF,
+  wireSizeAlonzoTxF,
   isValidAlonzoTxL,
   txdats',
   txscripts',
@@ -146,6 +147,7 @@ import Data.Maybe.Strict (
 import Data.Set (Set)
 import qualified Data.Set as Set
 import Data.Typeable (Typeable)
+import Data.Word (Word32)
 import GHC.Generics (Generic)
 import Lens.Micro hiding (set)
 import NoThunks.Class (NoThunks)
@@ -189,6 +191,9 @@ instance Crypto c => EraTx (AlonzoEra c) where
   sizeTxF = sizeAlonzoTxF
   {-# INLINE sizeTxF #-}
 
+  wireSizeTxF = wireSizeAlonzoTxF
+  {-# INLINE wireSizeTxF #-}
+
   validateNativeScript = validateTimelock
   {-# INLINE validateNativeScript #-}
 
@@ -235,7 +240,7 @@ auxDataAlonzoTxL :: Lens' (AlonzoTx era) (StrictMaybe (TxAuxData era))
 auxDataAlonzoTxL = lens auxiliaryData (\tx txTxAuxData -> tx {auxiliaryData = txTxAuxData})
 {-# INLINEABLE auxDataAlonzoTxL #-}
 
--- | txsize computes the length of the serialised bytes
+-- | txsize computes the length of the serialised bytes (for estimations)
 sizeAlonzoTxF :: forall era. EraTx era => SimpleGetter (AlonzoTx era) Integer
 sizeAlonzoTxF =
   to $
@@ -245,6 +250,21 @@ sizeAlonzoTxF =
       . toCBORForSizeComputation
 {-# INLINEABLE sizeAlonzoTxF #-}
 
+-- | txsize computes the length of the serialised bytes (actual size)
+wireSizeAlonzoTxF :: forall era. EraTx era => SimpleGetter (AlonzoTx era) Word32
+wireSizeAlonzoTxF =
+  to $
+    checkedFromIntegral
+      . LBS.length
+      . serialize (eraProtVerLow @era)
+      . encCBOR
+  where
+    checkedFromIntegral n =
+      if n <= fromIntegral (maxBound :: Word32)
+        then fromIntegral n
+        else error $ "Impossible: Size of the transaction is too big: " ++ show n
+{-# INLINEABLE wireSizeAlonzoTxF #-}
+
 isValidAlonzoTxL :: Lens' (AlonzoTx era) IsValid
 isValidAlonzoTxL = lens isValid (\tx valid -> tx {isValid = valid})
 {-# INLINEABLE isValidAlonzoTxL #-}
diff --git a/eras/babbage/impl/src/Cardano/Ledger/Babbage/Tx.hs b/eras/babbage/impl/src/Cardano/Ledger/Babbage/Tx.hs
index 03180d62eeb..472347aae2e 100644
--- a/eras/babbage/impl/src/Cardano/Ledger/Babbage/Tx.hs
+++ b/eras/babbage/impl/src/Cardano/Ledger/Babbage/Tx.hs
@@ -50,6 +50,9 @@ instance Crypto c => EraTx (BabbageEra c) where
   sizeTxF = sizeAlonzoTxF
   {-# INLINE sizeTxF #-}
 
+  wireSizeTxF = wireSizeAlonzoTxF
+  {-# INLINE wireSizeTxF #-}
+
   validateNativeScript = validateTimelock
   {-# INLINE validateNativeScript #-}
 
diff --git a/eras/conway/impl/src/Cardano/Ledger/Conway/Tx.hs b/eras/conway/impl/src/Cardano/Ledger/Conway/Tx.hs
index b44038cc36b..0976f8065ed 100644
--- a/eras/conway/impl/src/Cardano/Ledger/Conway/Tx.hs
+++ b/eras/conway/impl/src/Cardano/Ledger/Conway/Tx.hs
@@ -21,6 +21,7 @@ import Cardano.Ledger.Alonzo.Tx (
   isValidAlonzoTxL,
   mkBasicAlonzoTx,
   sizeAlonzoTxF,
+  wireSizeAlonzoTxF,
   witsAlonzoTxL,
  )
 import Cardano.Ledger.Alonzo.TxSeq (
@@ -65,6 +66,9 @@ instance Crypto c => EraTx (ConwayEra c) where
   sizeTxF = sizeAlonzoTxF
   {-# INLINE sizeTxF #-}
 
+  wireSizeTxF = wireSizeAlonzoTxF
+  {-# INLINE wireSizeTxF #-}
+
   validateNativeScript = validateTimelock
   {-# INLINE validateNativeScript #-}
 
diff --git a/eras/mary/impl/src/Cardano/Ledger/Mary/Tx.hs b/eras/mary/impl/src/Cardano/Ledger/Mary/Tx.hs
index d9e166e9f52..9fa175fac62 100644
--- a/eras/mary/impl/src/Cardano/Ledger/Mary/Tx.hs
+++ b/eras/mary/impl/src/Cardano/Ledger/Mary/Tx.hs
@@ -23,6 +23,7 @@ import Cardano.Ledger.Shelley.Tx (
   mkBasicShelleyTx,
   shelleyMinFeeTx,
   sizeShelleyTxF,
+  wireSizeShelleyTxF,
   witsShelleyTxL,
  )
 
@@ -47,6 +48,9 @@ instance Crypto c => EraTx (MaryEra c) where
   sizeTxF = sizeShelleyTxF
   {-# INLINE sizeTxF #-}
 
+  wireSizeTxF = wireSizeShelleyTxF
+  {-# INLINE wireSizeTxF #-}
+
   validateNativeScript = validateTimelock
   {-# INLINE validateNativeScript #-}
 
diff --git a/eras/shelley/impl/CHANGELOG.md b/eras/shelley/impl/CHANGELOG.md
index c27f22964f3..3db8cc09404 100644
--- a/eras/shelley/impl/CHANGELOG.md
+++ b/eras/shelley/impl/CHANGELOG.md
@@ -4,6 +4,8 @@
 
 * Add `translateToShelleyLedgerStateFromUtxo`
 
+* Added `wireSizeShelleyTxF`
+
 ### `testlib`
 
 * Add `submitFailingTxM`
diff --git a/eras/shelley/impl/src/Cardano/Ledger/Shelley/Tx.hs b/eras/shelley/impl/src/Cardano/Ledger/Shelley/Tx.hs
index baced876e01..c61af5a8f75 100644
--- a/eras/shelley/impl/src/Cardano/Ledger/Shelley/Tx.hs
+++ b/eras/shelley/impl/src/Cardano/Ledger/Shelley/Tx.hs
@@ -28,6 +28,7 @@ module Cardano.Ledger.Shelley.Tx (
   witsShelleyTxL,
   auxDataShelleyTxL,
   sizeShelleyTxF,
+  wireSizeShelleyTxF,
   segwitTx,
   mkBasicShelleyTx,
   shelleyMinFeeTx,
@@ -86,6 +87,7 @@ import Data.Maybe.Strict (
 import Data.Set (Set)
 import qualified Data.Set as Set
 import Data.Typeable (Typeable)
+import Data.Word (Word32)
 import GHC.Generics (Generic)
 import Lens.Micro (Lens', SimpleGetter, lens, to, (^.))
 import NoThunks.Class (NoThunks (..))
@@ -168,6 +170,14 @@ sizeShelleyTxF :: Era era => SimpleGetter (ShelleyTx era) Integer
 sizeShelleyTxF = to (\(TxConstr (Memo _ bytes)) -> fromIntegral $ SBS.length bytes)
 {-# INLINEABLE sizeShelleyTxF #-}
 
+wireSizeShelleyTxF :: Era era => SimpleGetter (ShelleyTx era) Word32
+wireSizeShelleyTxF = to $ \(TxConstr (Memo _ bytes)) ->
+  let n = SBS.length bytes
+   in if n <= fromIntegral (maxBound :: Word32)
+        then fromIntegral n
+        else error $ "Impossible: Size of the transaction is too big: " ++ show n
+{-# INLINEABLE wireSizeShelleyTxF #-}
+
 mkShelleyTx :: EraTx era => ShelleyTxRaw era -> ShelleyTx era
 mkShelleyTx = TxConstr . memoBytes . encodeShelleyTxRaw
 {-# INLINEABLE mkShelleyTx #-}
@@ -200,6 +210,9 @@ instance Crypto c => EraTx (ShelleyEra c) where
   sizeTxF = sizeShelleyTxF
   {-# INLINE sizeTxF #-}
 
+  wireSizeTxF = wireSizeShelleyTxF
+  {-# INLINE wireSizeTxF #-}
+
   validateNativeScript = validateMultiSig
   {-# INLINE validateNativeScript #-}
 
diff --git a/libs/cardano-ledger-core/CHANGELOG.md b/libs/cardano-ledger-core/CHANGELOG.md
index a84ca24b343..008704a8de2 100644
--- a/libs/cardano-ledger-core/CHANGELOG.md
+++ b/libs/cardano-ledger-core/CHANGELOG.md
@@ -12,6 +12,7 @@
 * Change default implementation of `translateEra`
 * Add `EraGenesis` and `Genesis` type family. New `NoGenesis` type to be used for eras that do not have a genesis file
 * Move `ensureMinCoinTxOut` from `cardano-ledger-api` to `Cardano.Ledger.Tools`
+* Add `wireSizeTxF` to `EraTx` class
 
 ### `testlib`
 
diff --git a/libs/cardano-ledger-core/src/Cardano/Ledger/Core.hs b/libs/cardano-ledger-core/src/Cardano/Ledger/Core.hs
index e2fe27b18a9..3503623dec8 100644
--- a/libs/cardano-ledger-core/src/Cardano/Ledger/Core.hs
+++ b/libs/cardano-ledger-core/src/Cardano/Ledger/Core.hs
@@ -118,7 +118,7 @@ import Data.Maybe.Strict (StrictMaybe)
 import Data.Sequence.Strict (StrictSeq)
 import Data.Set (Set)
 import Data.Void (Void)
-import Data.Word (Word64)
+import Data.Word (Word32, Word64)
 import GHC.Stack (HasCallStack)
 import Lens.Micro
 import NoThunks.Class (NoThunks)
@@ -153,8 +153,12 @@ class
 
   auxDataTxL :: Lens' (Tx era) (StrictMaybe (AuxiliaryData era))
 
+  -- | For fee calculation and estimations of impact on block space
   sizeTxF :: SimpleGetter (Tx era) Integer
 
+  -- | For end use by eg. diffusion layer in transaction submission protocol
+  wireSizeTxF :: SimpleGetter (Tx era) Word32
+
   -- | Using information from the transaction validate the supplied native script.
   validateNativeScript :: Tx era -> NativeScript era -> Bool