diff --git a/daemon/HTTPServer.cpp b/daemon/HTTPServer.cpp
index d9daeb5e..5095bcd7 100644
--- a/daemon/HTTPServer.cpp
+++ b/daemon/HTTPServer.cpp
@@ -289,6 +289,11 @@ namespace http {
 		if (family.length () > 0)
 			s << "<b>"<< tr("Family") << ":</b> " << family << "<br>\r\n";
 		s << "<b>" << tr("Tunnel creation success rate") << ":</b> " << i2p::tunnel::tunnels.GetTunnelCreationSuccessRate () << "%<br>\r\n";
+		bool isOldTCSR;
+		i2p::config::GetOption("http.old_tcsr", isOldTCSR);
+		if (isOldTCSR) {
+			s << "<b>" << tr("Tunnel creation success rate (old algorithm)") << ":</b> " << i2p::tunnel::tunnels.OldGetTunnelCreationSuccessRate() << "%<br/>\r\n";
+		}
 		s << "<b>" << tr("Received") << ":</b> ";
 		ShowTraffic (s, i2p::transport::transports.GetTotalReceivedBytes ());
 		s << " (" << tr(/* tr: Kibibyte/s */ "%.2f KiB/s", (double) i2p::transport::transports.GetInBandwidth15s () / 1024) << ")<br>\r\n";
diff --git a/libi2pd/Config.cpp b/libi2pd/Config.cpp
index 07ab2f20..9181e28e 100644
--- a/libi2pd/Config.cpp
+++ b/libi2pd/Config.cpp
@@ -95,6 +95,7 @@ namespace config {
 			("http.hostname", value<std::string>()->default_value("localhost"), "Expected hostname for WebUI")
 			("http.webroot", value<std::string>()->default_value("/"),          "WebUI root path (default: / )")
 			("http.lang", value<std::string>()->default_value("english"),       "WebUI language (default: english )")
+			("http.old_tcsr", value<bool>()->default_value(false),          "Show TCSR with old algorithm (default: false)")
 		;
 
 		options_description httpproxy("HTTP Proxy options");
diff --git a/libi2pd/Tunnel.cpp b/libi2pd/Tunnel.cpp
index 4d205544..d19649d6 100644
--- a/libi2pd/Tunnel.cpp
+++ b/libi2pd/Tunnel.cpp
@@ -332,7 +332,8 @@ namespace tunnel
 	Tunnels tunnels;
 
 	Tunnels::Tunnels (): m_IsRunning (false), m_Thread (nullptr),
-		m_TunnelCreationSuccessRate (TCSR_START_VALUE), m_TunnelCreationAttemptsNum(0) {
+		m_TunnelCreationSuccessRate (TCSR_START_VALUE), m_TunnelCreationAttemptsNum(0),
+		m_OldNumSuccesiveTunnelCreations (0), m_OldNumFailedTunnelCreations (0) {
 	}
 
 	Tunnels::~Tunnels ()
@@ -634,6 +635,7 @@ namespace tunnel
 						// delete
 						it = pendingTunnels.erase (it);
 						FailedTunnelCreation();
+						m_OldNumFailedTunnelCreations++;
 					}
 					else
 						++it;
@@ -642,6 +644,7 @@ namespace tunnel
 					LogPrint (eLogDebug, "Tunnel: Pending build request ", it->first, " failed, deleted");
 					it = pendingTunnels.erase (it);
 					FailedTunnelCreation();
+					m_OldNumFailedTunnelCreations++;
 				break;
 				case eTunnelStateBuildReplyReceived:
 					// intermediate state, will be either established of build failed
@@ -651,6 +654,7 @@ namespace tunnel
 					// success
 					it = pendingTunnels.erase (it);
 					SuccesiveTunnelCreation();
+					m_OldNumSuccesiveTunnelCreations++;
 			}
 		}
 	}
diff --git a/libi2pd/Tunnel.h b/libi2pd/Tunnel.h
index 7fa1eb54..a997502a 100644
--- a/libi2pd/Tunnel.h
+++ b/libi2pd/Tunnel.h
@@ -269,7 +269,9 @@ namespace tunnel
 			i2p::util::Queue<std::shared_ptr<I2NPMessage> > m_Queue;
 			i2p::util::MemoryPoolMt<I2NPMessageBuffer<I2NP_TUNNEL_ENPOINT_MESSAGE_SIZE> > m_I2NPTunnelEndpointMessagesMemoryPool;
 			i2p::util::MemoryPoolMt<I2NPMessageBuffer<I2NP_TUNNEL_MESSAGE_SIZE> > m_I2NPTunnelMessagesMemoryPool;
-
+			// some old stats
+			int m_OldNumSuccesiveTunnelCreations, m_OldNumFailedTunnelCreations;
+			
 			// Calculating of tunnel creation success rate
 			// A modified version of the EWMA algorithm, where alpha is increased at the beginning to accelerate similarity
 			void SuccesiveTunnelCreation() {
@@ -297,6 +299,11 @@ namespace tunnel
 
 			int GetQueueSize () { return m_Queue.GetSize (); };
 			int GetTunnelCreationSuccessRate () const { return std::round(m_TunnelCreationSuccessRate * 100); } // in percents
+			int OldGetTunnelCreationSuccessRate () const // in percents
+			{
+				int totalNum = m_OldNumSuccesiveTunnelCreations + m_OldNumFailedTunnelCreations;
+				return totalNum ? m_OldNumSuccesiveTunnelCreations*100/totalNum : 0;
+			}
 	};
 
 	extern Tunnels tunnels;