diff --git a/include/trick/RealtimeSync.hh b/include/trick/RealtimeSync.hh
index c2140b40a..50ed7f781 100644
--- a/include/trick/RealtimeSync.hh
+++ b/include/trick/RealtimeSync.hh
@@ -110,6 +110,9 @@ namespace Trick {
             /** The clock time when the sim ended.  Used for total actual time calculation.\n */
             long long sim_end_time ;           /**< trick_units(--) */
 
+            /** The actual simulation time/wall clock time ratio\n */
+            double actual_run_ratio ;           /**< trick_units(--) */
+
             /**
              @brief This is the constructor of the RealtimeSync class.  It starts the RealtimeSync as
              disabled and sets the maximum overrun parameters to basically infinity.
diff --git a/trick_source/java/src/main/java/trick/simcontrol/SimControlApplication.java b/trick_source/java/src/main/java/trick/simcontrol/SimControlApplication.java
index 2faad6ed0..545ed9882 100644
--- a/trick_source/java/src/main/java/trick/simcontrol/SimControlApplication.java
+++ b/trick_source/java/src/main/java/trick/simcontrol/SimControlApplication.java
@@ -788,7 +788,7 @@ private void scheduleGetSimState() {
 
             status_vars = "trick.var_add(\"trick_sys.sched.time_tics\") \n" +
                           "trick.var_add(\"trick_sys.sched.mode\") \n" +
-                          "trick.var_add(\"trick_real_time.gtod_clock.rt_clock_ratio\") \n" +
+                          "trick.var_add(\"trick_real_time.rt_sync.actual_run_ratio\") \n" +
                           "trick.var_add(\"trick_real_time.rt_sync.active\") \n";
 
             if ( debug_present != 0 ) {
@@ -1673,7 +1673,7 @@ protected Void doInBackground() {
                                 ii++ ;
                             }
 
-                            // "real_time.gtod_clock.rt_clock_ratio"
+                            // "real_time.rt_sync.actual_run_ratio"
                             if (results.length > ii && results[ii] != null && results[ii] != "") {
                                 simState.setSimRealtimeRatio(Float.parseFloat(results[ii]));
                                 ii++ ;
diff --git a/trick_source/sim_services/RealtimeSync/RealtimeSync.cpp b/trick_source/sim_services/RealtimeSync/RealtimeSync.cpp
index 2b7e0f209..22bd8cbf2 100644
--- a/trick_source/sim_services/RealtimeSync/RealtimeSync.cpp
+++ b/trick_source/sim_services/RealtimeSync/RealtimeSync.cpp
@@ -9,6 +9,7 @@
 #include <iostream>
 #include <sstream>
 #include <iomanip>
+#include <cmath>
 #include "trick/RealtimeSync.hh"
 #include "trick/exec_proto.h"
 #include "trick/sim_mode.h"
@@ -48,6 +49,8 @@ Trick::RealtimeSync::RealtimeSync( Trick::Clock * in_clock , Trick::Timer * in_t
     sim_end_init_time = 0 ;
     sim_end_time = 0 ;
 
+    actual_run_ratio = 0.0;
+
     the_rts = this ;
 
 }
@@ -250,6 +253,33 @@ int Trick::RealtimeSync::start_realtime(double in_frame_time , long long ref_tim
     return(0) ;
 }
 
+template <size_t N>
+class Run_Ratio {
+  public:
+    Run_Ratio() : num_samples(0) {}
+    Run_Ratio& operator()(long long sample, double in_rt_ratio)
+    {
+        samples[num_samples++ % N] = sample;
+        rt_ratio = in_rt_ratio;
+        return *this;
+    }
+
+    operator double() const {
+        if ( num_samples <= 1 ) {
+            return 0.0 ;
+        } else if ( num_samples < N ) {
+            return round(exec_get_software_frame() * (num_samples-1) * exec_get_time_tic_value() * rt_ratio / (double)(samples[num_samples - 1] - samples[0])*100.0)/100.0 ;
+        } else {
+            return round(exec_get_software_frame() * (N-1) * exec_get_time_tic_value() * rt_ratio / (double)(samples[(num_samples - 1) % N] - samples[num_samples % N])*100.0)/100.0 ;
+        }
+    }
+
+  private:
+    long long samples[N];
+    size_t num_samples;
+    double rt_ratio;
+};
+
 /**
 @details
 -# If real-time is not active:
@@ -282,6 +312,7 @@ int Trick::RealtimeSync::rt_monitor(long long sim_time_tics) {
 
     long long curr_clock_time ;
     char buf[512];
+    static Run_Ratio<100> run_ratio ;
 
     /* calculate the current underrun/overrun */
     curr_clock_time = rt_clock->clock_time() ;
@@ -301,6 +332,8 @@ int Trick::RealtimeSync::rt_monitor(long long sim_time_tics) {
         if ( disable_flag ) {
             disable_flag = false ;
         }
+        /* calculate run ratio in non-realtime mode */
+        actual_run_ratio = run_ratio(curr_clock_time, 1.0);
         return(0) ;
     }
     if ( enable_flag ) {
@@ -367,6 +400,8 @@ int Trick::RealtimeSync::rt_monitor(long long sim_time_tics) {
         /* If the timer requires to be reset at the end of each frame, reset it here. */
         sleep_timer->reset(exec_get_software_frame() / rt_clock->get_rt_clock_ratio()) ;
 
+        /* Calculate the run ratio after sleeping */
+        actual_run_ratio = run_ratio(curr_clock_time, rt_clock->get_rt_clock_ratio());
     }
 
     return(0) ;
@@ -508,4 +543,4 @@ int Trick::RealtimeSync::shutdown() {
 
 bool Trick::RealtimeSync::is_active() {
     return active;
-}
\ No newline at end of file
+}