diff --git a/hyptop/helper.c b/hyptop/helper.c
index 85b06682..9c0f6c89 100644
--- a/hyptop/helper.c
+++ b/hyptop/helper.c
@@ -402,7 +402,7 @@ void hyptop_helper_init(void)
 s64 ht_calculate_smt_util(u64 core_us, u64 thr_us, u64 mgm_us, int thread_per_core)
 {
 	s64 component1, component2, smt_us;
-	double smt_factor = SMT_FACTOR_DEFAULT;
+	double smt_factor = g.o.smt_factor;
 
 	component1 = G0(thread_per_core * core_us - thr_us);
 	if (thread_per_core > 1)
diff --git a/hyptop/helper.h b/hyptop/helper.h
index 5ed92519..9679c2aa 100644
--- a/hyptop/helper.h
+++ b/hyptop/helper.h
@@ -21,7 +21,6 @@
 #include "lib/zt_common.h"
 
 #define G0(x) MAX(0, (s64) (x))
-#define SMT_FACTOR_DEFAULT 1.3
 
 /*
  * Helper Prototypes
diff --git a/hyptop/hyptop.8 b/hyptop/hyptop.8
index 739835cc..bac826bd 100644
--- a/hyptop/hyptop.8
+++ b/hyptop/hyptop.8
@@ -74,6 +74,18 @@ In this mode no user input is accepted.
 .BR "\-d <SECONDS>" " or " "\-\-delay=<SECONDS>"
 Specifies the delay between screen updates.
 .TP
+.BR "\-m <FACTOR>" " or " "\-\-smt_factor=<FACTOR>"
+Specifies a workload dependent SMT speedup factor.
+For IBM z15 servers, the default value is 1.3. If the workload benefits
+from SMT, you can specify a higher value. If the workload does not benefit
+from SMT, specifying lower values results in more accurate reports of
+real CPU SMT utilization field for LPARs. There is no hard boundary except
+that it must be a positive value. Example ranges to select a sensible value
+from:
+
+ For IBM z13: [0.8, 1.3]
+ For IBM z15: [1.1, 1.5]
+.TP
 .BR "\-n <ITERATIONS>" " or " "\-\-iterations=<ITERATIONS>"
 Specifies the maximum number of iterations before ending.
 
diff --git a/hyptop/hyptop.h b/hyptop/hyptop.h
index 7648bbf4..0ce68873 100644
--- a/hyptop/hyptop.h
+++ b/hyptop/hyptop.h
@@ -22,6 +22,7 @@
 #include "table.h"
 
 #define HYPTOP_OPT_DEFAULT_DELAY	2
+#define HYPTOP_OPT_DEFAULT_SMT_SCALE	1.3
 #define HYPTOP_MAX_WIN_DEPTH		4
 #define HYPTOP_MAX_LINE			512
 #define PROG_NAME			"hyptop"
@@ -60,6 +61,8 @@ struct hyptop_opts {
 
 	int				delay_s;
 	int				delay_us;
+
+	double				smt_factor;
 };
 
 /*
diff --git a/hyptop/opts.c b/hyptop/opts.c
index 07dca3a2..13953a0c 100644
--- a/hyptop/opts.c
+++ b/hyptop/opts.c
@@ -39,6 +39,7 @@ static char HELP_TEXT[] =
 "-t, --cpu_types TYPE[,..]       CPU types used for time calculations\n"
 "-b, --batch_mode                Use batch mode (no curses)\n"
 "-d, --delay SECONDS             Delay time between screen updates\n"
+"-m, --smt_factor FACTOR         Machine generation dependent SMT speedup factor.\n"
 "-n, --iterations NUMBER         Number of iterations before ending\n";
 
 /*
@@ -48,6 +49,7 @@ static void l_init_defaults(void)
 {
 	g.prog_name = PROG_NAME;
 	g.o.delay_s = HYPTOP_OPT_DEFAULT_DELAY;
+	g.o.smt_factor = HYPTOP_OPT_DEFAULT_SMT_SCALE;
 	g.w.cur = &win_sys_list;
 	g.o.cur_win = &win_sys_list;
 }
@@ -108,6 +110,20 @@ static void l_delay_set(char *delay_string)
 	g.o.delay_us = 0;
 }
 
+/*
+ * Set SMT factor option
+ */
+static void l_factor_set(char *value_string)
+{
+	double factor;
+
+	if (sscanf(value_string, "%lf", &factor) != 1)
+		ERR_EXIT("The SMT factor \"%s\" is invalid\n", value_string);
+	if (factor <= 0)
+		ERR_EXIT("The SMT factor \"%s\" is <= 0\n", value_string);
+	g.o.smt_factor = factor;
+}
+
 /*
  * Get number of occurrences of character 'c' in "str"
  */
@@ -299,6 +315,7 @@ void opts_parse(int argc, char *argv[])
 		{ "help",        no_argument,       NULL, 'h'},
 		{ "batch_mode",  no_argument,       NULL, 'b'},
 		{ "delay",       required_argument, NULL, 'd'},
+		{ "smt_factor",  required_argument, NULL, 'm'},
 		{ "window",      required_argument, NULL, 'w'},
 		{ "sys",         required_argument, NULL, 's'},
 		{ "iterations",  required_argument, NULL, 'n'},
@@ -307,7 +324,7 @@ void opts_parse(int argc, char *argv[])
 		{ "cpu_types",   required_argument, NULL, 't'},
 		{ NULL,          0,                 NULL, 0  }
 	};
-	static const char option_string[] = "vhbd:w:s:n:f:t:S:";
+	static const char option_string[] = "vhbd:m:w:s:n:f:t:S:";
 
 	l_init_defaults();
 	while (1) {
@@ -328,6 +345,9 @@ void opts_parse(int argc, char *argv[])
 		case 'd':
 			l_delay_set(optarg);
 			break;
+		case 'm':
+			l_factor_set(optarg);
+			break;
 		case 'w':
 			l_window_set(optarg);
 			break;