diff --git a/include/libzutil.h b/include/libzutil.h
index f8712340cc5e..f6c8102a1e31 100644
--- a/include/libzutil.h
+++ b/include/libzutil.h
@@ -144,13 +144,15 @@ _LIBZUTIL_H boolean_t zfs_isnumber(const char *);
  * ZFS_NICENUM_TIME:	Print nanosecs, microsecs, millisecs, seconds...
  * ZFS_NICENUM_RAW:	Print the raw number without any formatting
  * ZFS_NICENUM_RAWTIME:	Same as RAW, but print dashes ('-') for zero.
+ * ZFS_NICENUM_1000: Same as ZFS_NICENUM_BYTES but use powers of 1000.
  */
 enum zfs_nicenum_format {
 	ZFS_NICENUM_1024 = 0,
 	ZFS_NICENUM_BYTES = 1,
 	ZFS_NICENUM_TIME = 2,
 	ZFS_NICENUM_RAW = 3,
-	ZFS_NICENUM_RAWTIME = 4
+	ZFS_NICENUM_RAWTIME = 4,
+	ZFS_NICENUM_1000 = 5
 };
 
 /*
diff --git a/lib/libzutil/zutil_nicenum.c b/lib/libzutil/zutil_nicenum.c
index e05bcb40a8ce..54b9a34a5dae 100644
--- a/lib/libzutil/zutil_nicenum.c
+++ b/lib/libzutil/zutil_nicenum.c
@@ -26,6 +26,7 @@
 #include <ctype.h>
 #include <math.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <libzutil.h>
 #include <string.h>
 
@@ -64,19 +65,22 @@ zfs_nicenum_format(uint64_t num, char *buf, size_t buflen,
 	uint64_t n = num;
 	int index = 0;
 	const char *u;
-	const char *units[3][7] = {
+	const char *units[6][7] = {
 	    [ZFS_NICENUM_1024] = {"", "K", "M", "G", "T", "P", "E"},
 	    [ZFS_NICENUM_BYTES] = {"B", "K", "M", "G", "T", "P", "E"},
-	    [ZFS_NICENUM_TIME] = {"ns", "us", "ms", "s", "?", "?", "?"}
+	    [ZFS_NICENUM_TIME] = {"ns", "us", "ms", "s", "?", "?", "?"},
+	    [ZFS_NICENUM_1000] = {"B", "K", "M", "G", "T", "P", "E"}
 	};
 
 	const int units_len[] = {[ZFS_NICENUM_1024] = 6,
 	    [ZFS_NICENUM_BYTES] = 6,
-	    [ZFS_NICENUM_TIME] = 4};
+	    [ZFS_NICENUM_TIME] = 4,
+	    [ZFS_NICENUM_1000] = 6};
 
 	const int k_unit[] = {	[ZFS_NICENUM_1024] = 1024,
 	    [ZFS_NICENUM_BYTES] = 1024,
-	    [ZFS_NICENUM_TIME] = 1000};
+	    [ZFS_NICENUM_TIME] = 1000,
+	    [ZFS_NICENUM_1000] = 1000};
 
 	double val;
 
@@ -180,5 +184,9 @@ zfs_niceraw(uint64_t num, char *buf, size_t buflen)
 void
 zfs_nicebytes(uint64_t num, char *buf, size_t buflen)
 {
-	zfs_nicenum_format(num, buf, buflen, ZFS_NICENUM_BYTES);
+	if (getenv("ZFS_OUTPUT_BYTES_SI") != NULL) {
+		zfs_nicenum_format(num, buf, buflen, ZFS_NICENUM_1000);
+	} else {
+		zfs_nicenum_format(num, buf, buflen, ZFS_NICENUM_BYTES);
+	}
 }
diff --git a/man/man8/zdb.8 b/man/man8/zdb.8
index ae35454ad083..81eb3d7de157 100644
--- a/man/man8/zdb.8
+++ b/man/man8/zdb.8
@@ -567,6 +567,15 @@ refcnt   blocks   LSIZE   PSIZE   DSIZE   blocks   LSIZE   PSIZE   DSIZE
 dedup = 1.11, compress = 1.80, copies = 1.00, dedup * compress / copies = 2.00
 .Ed
 .
+.Sh ENVIRONMENT VARIABLES
+.Bl -tag -width "ZFS_OUTPUT_BYTES_SI"
+.\" Shared with zfs.8 and zpool.8
+.It Sy ZFS_OUTPUT_BYTES_SI
+Make K/M/G/T/P/E prefixes in
+.Nm zdb
+output to represent powers of 1000 bytes, i.e. KB, MB, GB, TB, PB, EB.
+.El
+.
 .Sh SEE ALSO
 .Xr zfs 8 ,
 .Xr zpool 8
diff --git a/man/man8/zfs.8 b/man/man8/zfs.8
index 2ee15ab21806..febaa3c33f0f 100644
--- a/man/man8/zfs.8
+++ b/man/man8/zfs.8
@@ -763,6 +763,12 @@ to set the maximum pipe size for sends/recieves.
 Disabled by default on Linux
 due to an unfixed deadlock in Linux's pipe size handling code.
 .
+.\" Shared with zdb.8 and zpool.8
+.It Sy ZFS_OUTPUT_BYTES_SI
+Make K/M/G/T/P/E prefixes in
+.Nm zfs
+output to represent powers of 1000 bytes, i.e. KB, MB, GB, TB, PB, EB.
+.
 .\" Shared with zpool.8
 .It Sy ZFS_MODULE_TIMEOUT
 Time, in seconds, to wait for
diff --git a/man/man8/zpool.8 b/man/man8/zpool.8
index 02a258f66708..5c215dd2f559 100644
--- a/man/man8/zpool.8
+++ b/man/man8/zpool.8
@@ -561,6 +561,12 @@ If
 .Sy ZPOOL_SCRIPTS_ENABLED
 is not set, it is assumed that the user is allowed to run
 .Nm zpool Cm status Ns / Ns Cm iostat Fl c .
+.\" Shared with zdb.8 and zfs.8
+.It Sy ZFS_OUTPUT_BYTES_SI
+Make K/M/G/T/P/E prefixes in
+.Nm zpool
+output to represent powers of 1000 bytes, i.e. KB, MB, GB, TB, PB, EB.
+.
 .\" Shared with zfs.8
 .It Sy ZFS_MODULE_TIMEOUT
 Time, in seconds, to wait for