diff --git a/src/main.h b/src/main.h
index fd418502a..5375e3827 100644
--- a/src/main.h
+++ b/src/main.h
@@ -916,6 +916,8 @@ extern CBlockTreeDB *pblocktree;
  */
 int GetSpendHeight(const CCoinsViewCache& inputs);
 
+uint64_t CalculateCurrentUsage();
+
 /** Return a CMutableTransaction with contextual default values based on set of consensus rules at height */
 CMutableTransaction CreateNewContextualCMutableTransaction(const Consensus::Params& consensusParams, int nHeight);
 
diff --git a/src/rpcblockchain.cpp b/src/rpcblockchain.cpp
index e9cf54bb4..98291405c 100644
--- a/src/rpcblockchain.cpp
+++ b/src/rpcblockchain.cpp
@@ -1253,6 +1253,7 @@ void NetworkUpgradeDescPushBack(
     }
 }
 
+
 UniValue getblockchaininfo(const UniValue& params, bool fHelp)
 {
     if (fHelp || params.size() != 0)
@@ -1270,6 +1271,7 @@ UniValue getblockchaininfo(const UniValue& params, bool fHelp)
             "  \"difficulty\": xxxxxx,     (numeric) the current difficulty\n"
             "  \"verificationprogress\": xxxx, (numeric) estimate of verification progress [0..1]\n"
             "  \"chainwork\": \"xxxx\"     (string) total amount of work in active chain, in hexadecimal\n"
+            "  \"size_on_disk\": xxxxxx,       (numeric) the estimated size of the block and undo files on disk\n"
             "  \"commitments\": xxxxxx,    (numeric) the current number of note commitments in the commitment tree\n"
             "  \"softforks\": [            (array) status of softforks in progress\n"
             "     {\n"
@@ -1319,6 +1321,7 @@ UniValue getblockchaininfo(const UniValue& params, bool fHelp)
     obj.push_back(Pair("verificationprogress",  progress));
     obj.push_back(Pair("chainwork",             chainActive.LastTip()->nChainWork.GetHex()));
     obj.push_back(Pair("pruned",                fPruneMode));
+    obj.push_back(Pair("size_on_disk",          CalculateCurrentUsage()));
 
     ZCIncrementalMerkleTree tree;
     pcoinsTip->GetAnchorAt(pcoinsTip->GetBestAnchor(), tree);