diff --git a/usr.sbin/pstat/pstat.8 b/usr.sbin/pstat/pstat.8
index 9aec51b472a4..5e8f72f0056e 100644
--- a/usr.sbin/pstat/pstat.8
+++ b/usr.sbin/pstat/pstat.8
@@ -60,8 +60,10 @@ If invoked as
 the
 .Fl s
 option is implied, and only the
-.Fl k
-option is legal.
+.Fl [kmg]
+and
+.Fl h
+options are legal.
 .Pp
 If the
 .Fl M
@@ -86,6 +88,14 @@ Byte, Kilobyte, Megabyte, Gigabyte, Terabyte and Petabyte.
 Print sizes in kilobytes, regardless of the setting of the
 .Ev BLOCKSIZE
 environment variable.
+.It Fl m
+Print sizes in megabytes, regardless of the setting of the
+.Ev BLOCKSIZE
+environment variable.
+.It Fl g
+Print sizes in gigabytes, regardless of the setting of the
+.Ev BLOCKSIZE
+environment variable.
 .It Fl T
 Print the number of used and free slots in several system tables.
 This is useful for checking to see how large system tables have become
diff --git a/usr.sbin/pstat/pstat.c b/usr.sbin/pstat/pstat.c
index a64fb6e26b1f..35159b2baef4 100644
--- a/usr.sbin/pstat/pstat.c
+++ b/usr.sbin/pstat/pstat.c
@@ -122,8 +122,8 @@ main(int argc, char *argv[])
 		opts = argv[0];
 	if (!strcmp(opts, "swapinfo")) {
 		swapflag = 1;
-		opts = "hkM:N:";
-		usagestr = "swapinfo [-hk] [-M core [-N system]]";
+		opts = "ghkmM:N:";
+		usagestr = "swapinfo [-ghkm] [-M core [-N system]]";
 	} else {
 		opts = "TM:N:hfknst";
 		usagestr = "pstat [-Tfhknst] [-M core [-N system]]";
@@ -134,12 +134,18 @@ main(int argc, char *argv[])
 		case 'f':
 			fileflag = 1;
 			break;
+		case 'g':
+			putenv("BLOCKSIZE=1G");
+			break;
 		case 'h':
 			humanflag = 1;
 			break;
 		case 'k':
 			putenv("BLOCKSIZE=1K");
 			break;
+		case 'm':
+			putenv("BLOCKSIZE=1M");
+			break;
 		case 'M':
 			memf = optarg;
 			break;