diff --git a/bin/df/df.1 b/bin/df/df.1
--- a/bin/df/df.1
+++ b/bin/df/df.1
@@ -26,7 +26,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd July 16, 2025
+.Dd January 3, 2026
 .Dt DF 1
 .Os
 .Sh NAME
@@ -208,7 +208,7 @@
 devfs        devfs       1.0K    1.0K      0B   100%    /dev
 /dev/ada0p1  ufs         1.8T    168G    1.5T    10%    /data
 linsysfs     linsysfs    4.0K    4.0K      0B   100%    /compat/linux/sys
-/dev/da0     msdosfs     7.6G    424M    7.2G     5%    /mnt/usb
+/dev/da0     msdosfs     7.6G    424M    7.2G     6%    /mnt/usb
 .Ed
 .Pp
 Show previously collected data including inode statistics except for devfs or
@@ -220,13 +220,10 @@
 option can be specified only once:
 .Bd -literal -offset indent
 $ df -i -n -t nodevfs,linsysfs
-Filesystem   1K-blocks      Used      Avail Capacity iused     ifree %iused
-Mounted on
+Filesystem   1K-blocks      Used      Avail Capacity iused     ifree %iused  Mounted on
 /dev/ada1p2  223235736 159618992   45757888    78% 1657590  27234568    6%   /
-/dev/ada0p1 1892163184 176319420 1564470712    10% 1319710 243300576    1%
-/data
-/dev/da0       7989888    433664    7556224     5%       0         0  100%
-/mnt/usb
+/dev/ada0p1 1892163184 176319420 1564470712    11% 1319710 243300576    1%   /data
+/dev/da0       7989888    433664    7556224     6%       0         0     -   /mnt/usb
 .Ed
 .Pp
 Show human readable information for the file system containing the file
@@ -264,8 +261,8 @@
 .Xr getmntinfo 3 ,
 .Xr libxo 3 ,
 .Xr localeconv 3 ,
-.Xr xo_options 7 ,
 .Xr fstab 5 ,
+.Xr xo_options 7 ,
 .Xr mount 8 ,
 .Xr pstat 8 ,
 .Xr quot 8 ,
diff --git a/bin/df/df.c b/bin/df/df.c
--- a/bin/df/df.c
+++ b/bin/df/df.c
@@ -76,6 +76,7 @@
 static void	  prthuman(const struct statfs *, int64_t);
 static void	  prthumanval(const char *, int64_t);
 static intmax_t	  fsbtoblk(int64_t, uint64_t, u_long);
+static int	  percent(int64_t , int64_t);
 static void	  prtstat(struct statfs *, struct maxwidths *);
 static size_t	  regetmntinfo(struct statfs **, long);
 static void	  update_maxwidths(struct maxwidths *, const struct statfs *);
@@ -450,6 +451,15 @@
 	return (num * (intmax_t) fsbs / (int64_t) bs);
 }
 
+/*
+ * Calculate the percentage as an integer, rounded up to the next highest value.
+ */
+static int
+percent(int64_t used, int64_t avail)
+{
+	return (avail == 0 ? 100 : ((used * 100 + avail - 1) / avail));
+}
+
 /*
  * Print out status about a file system.
  */
@@ -528,8 +538,7 @@
 		    mwp->avail, fsbtoblk(sfsp->f_bavail,
 		    sfsp->f_bsize, blocksize));
 	}
-	xo_emit(" {:used-percent/%5.0f}{U:%%}",
-	    availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
+	xo_emit(" {:used-percent/%5d}{U:%%}", percent(used, availblks));
 	if (iflag) {
 		inodes = sfsp->f_files;
 		used = inodes - sfsp->f_ffree;
@@ -548,8 +557,8 @@
 		if (inodes == 0)
 			xo_emit(" {:inodes-used-percent/    -}{U:} ");
 		else {
-			xo_emit(" {:inodes-used-percent/%4.0f}{U:%%} ",
-				(double)used / (double)inodes * 100.0);
+			xo_emit(" {:inodes-used-percent/%4d}{U:%%} ",
+			    percent(used, inodes));
 		}
 	} else
 		xo_emit("  ");
diff --git a/bin/df/tests/t_df.sh b/bin/df/tests/t_df.sh
--- a/bin/df/tests/t_df.sh
+++ b/bin/df/tests/t_df.sh
@@ -20,50 +20,50 @@
 {
 	cat >expout <<EOF
 Filesystem    1K-blocks        Used       Avail Capacity  Mounted on
-filer:/      1202716672      135168  1202581504     0%    /filer
+filer:/      1202716672      135168  1202581504     1%    /filer
 filer:/      1202716672           0  1202716672     0%    /filer
-filer:/      1202716672   240543334   962173337    20%    /filer
-filer:/      1202716672   721630003   481086668    60%    /filer
-filer:/      1202716672  1142580838    60135833    95%    /filer
+filer:/      1202716672   240543334   962173337    21%    /filer
+filer:/      1202716672   721630003   481086668    61%    /filer
+filer:/      1202716672  1142580838    60135833    96%    /filer
 filer:/      1202716672  1202716672           0   100%    /filer
 filer:/      1202716672           0  1142580838     0%    /filer
-filer:/      1202716672   240543334   902037504    21%    /filer
-filer:/      1202716672   721630003   420950835    63%    /filer
+filer:/      1202716672   240543334   902037504    22%    /filer
+filer:/      1202716672   721630003   420950835    64%    /filer
 filer:/      1202716672  1142580838           0   100%    /filer
-filer:/      1202716672  1202716672   -60135833   105%    /filer
+filer:/      1202716672  1202716672   -60135833   106%    /filer
 filer:/      1202716672           0  1082445004     0%    /filer
-filer:/      1202716672   240543334   841901670    22%    /filer
+filer:/      1202716672   240543334   841901670    23%    /filer
 filer:/      1202716672   721630003   360815001    67%    /filer
 filer:/      1202716672  1142580838   -60135833   106%    /filer
-filer:/      1202716672  1202716672  -120271667   111%    /filer
+filer:/      1202716672  1202716672  -120271667   112%    /filer
 filer:/      1202716672           0  1022309171     0%    /filer
 filer:/      1202716672   240543334   781765836    24%    /filer
 filer:/      1202716672   721630003   300679168    71%    /filer
 filer:/      1202716672  1142580838  -120271667   112%    /filer
 filer:/      1202716672  1202716672  -180407500   118%    /filer
-/dev/ld0g    1308726116    17901268  1225388540     1%    /anon-root
+/dev/ld0g    1308726116    17901268  1225388540     2%    /anon-root
 /dev/ld0g    1308726116           0  1308726116     0%    /anon-root
-/dev/ld0g    1308726116   261745224  1046980892    20%    /anon-root
-/dev/ld0g    1308726116   785235672   523490444    60%    /anon-root
-/dev/ld0g    1308726116  1243289812    65436304    95%    /anon-root
+/dev/ld0g    1308726116   261745224  1046980892    21%    /anon-root
+/dev/ld0g    1308726116   785235672   523490444    61%    /anon-root
+/dev/ld0g    1308726116  1243289812    65436304    96%    /anon-root
 /dev/ld0g    1308726116  1308726116           0   100%    /anon-root
 /dev/ld0g    1308726116           0  1243289808     0%    /anon-root
-/dev/ld0g    1308726116   261745224   981544584    21%    /anon-root
-/dev/ld0g    1308726116   785235672   458054140    63%    /anon-root
+/dev/ld0g    1308726116   261745224   981544584    22%    /anon-root
+/dev/ld0g    1308726116   785235672   458054140    64%    /anon-root
 /dev/ld0g    1308726116  1243289812           0   100%    /anon-root
-/dev/ld0g    1308726116  1308726116   -65436304   105%    /anon-root
+/dev/ld0g    1308726116  1308726116   -65436304   106%    /anon-root
 /dev/ld0g    1308726116           0  1177853504     0%    /anon-root
-/dev/ld0g    1308726116   261745224   916108280    22%    /anon-root
+/dev/ld0g    1308726116   261745224   916108280    23%    /anon-root
 /dev/ld0g    1308726116   785235672   392617832    67%    /anon-root
 /dev/ld0g    1308726116  1243289812   -65436304   106%    /anon-root
-/dev/ld0g    1308726116  1308726116  -130872608   111%    /anon-root
+/dev/ld0g    1308726116  1308726116  -130872608   112%    /anon-root
 /dev/ld0g    1308726116           0  1112417196     0%    /anon-root
 /dev/ld0g    1308726116   261745224   850671972    24%    /anon-root
 /dev/ld0g    1308726116   785235672   327181528    71%    /anon-root
 /dev/ld0g    1308726116  1243289812  -130872608   112%    /anon-root
 /dev/ld0g    1308726116  1308726116  -196308916   118%    /anon-root
-/dev/strpct 21474836476 10737418240 10737418236    50%    /strpct
-/dev/wd0e      10485688     2859932     7625756    27%    /mount/windows/C
+/dev/strpct 21474836476 10737418240 10737418236    51%    /strpct
+/dev/wd0e      10485688     2859932     7625756    28%    /mount/windows/C
 EOF
 	atf_check -s exit:0 -o file:expout -e empty \
 	    -x "BLOCKSIZE=1k $(atf_get_srcdir)/h_df -n"
@@ -80,50 +80,50 @@
 {
 	cat >expout <<EOF
 Filesystem     Size    Used   Avail Capacity  Mounted on
-filer:/        1.1T    132M    1.1T     0%    /filer
+filer:/        1.1T    132M    1.1T     1%    /filer
 filer:/        1.1T      0B    1.1T     0%    /filer
-filer:/        1.1T    229G    918G    20%    /filer
-filer:/        1.1T    688G    459G    60%    /filer
-filer:/        1.1T    1.1T     57G    95%    /filer
+filer:/        1.1T    229G    918G    21%    /filer
+filer:/        1.1T    688G    459G    61%    /filer
+filer:/        1.1T    1.1T     57G    96%    /filer
 filer:/        1.1T    1.1T      0B   100%    /filer
 filer:/        1.1T      0B    1.1T     0%    /filer
-filer:/        1.1T    229G    860G    21%    /filer
-filer:/        1.1T    688G    401G    63%    /filer
+filer:/        1.1T    229G    860G    22%    /filer
+filer:/        1.1T    688G    401G    64%    /filer
 filer:/        1.1T    1.1T      0B   100%    /filer
-filer:/        1.1T    1.1T    -57G   105%    /filer
+filer:/        1.1T    1.1T    -57G   106%    /filer
 filer:/        1.1T      0B    1.0T     0%    /filer
-filer:/        1.1T    229G    803G    22%    /filer
+filer:/        1.1T    229G    803G    23%    /filer
 filer:/        1.1T    688G    344G    67%    /filer
 filer:/        1.1T    1.1T    -57G   106%    /filer
-filer:/        1.1T    1.1T   -115G   111%    /filer
+filer:/        1.1T    1.1T   -115G   112%    /filer
 filer:/        1.1T      0B    975G     0%    /filer
 filer:/        1.1T    229G    746G    24%    /filer
 filer:/        1.1T    688G    287G    71%    /filer
 filer:/        1.1T    1.1T   -115G   112%    /filer
 filer:/        1.1T    1.1T   -172G   118%    /filer
-/dev/ld0g      1.2T     17G    1.1T     1%    /anon-root
+/dev/ld0g      1.2T     17G    1.1T     2%    /anon-root
 /dev/ld0g      1.2T      0B    1.2T     0%    /anon-root
-/dev/ld0g      1.2T    250G    998G    20%    /anon-root
-/dev/ld0g      1.2T    749G    499G    60%    /anon-root
-/dev/ld0g      1.2T    1.2T     62G    95%    /anon-root
+/dev/ld0g      1.2T    250G    998G    21%    /anon-root
+/dev/ld0g      1.2T    749G    499G    61%    /anon-root
+/dev/ld0g      1.2T    1.2T     62G    96%    /anon-root
 /dev/ld0g      1.2T    1.2T      0B   100%    /anon-root
 /dev/ld0g      1.2T      0B    1.2T     0%    /anon-root
-/dev/ld0g      1.2T    250G    936G    21%    /anon-root
-/dev/ld0g      1.2T    749G    437G    63%    /anon-root
+/dev/ld0g      1.2T    250G    936G    22%    /anon-root
+/dev/ld0g      1.2T    749G    437G    64%    /anon-root
 /dev/ld0g      1.2T    1.2T      0B   100%    /anon-root
-/dev/ld0g      1.2T    1.2T    -62G   105%    /anon-root
+/dev/ld0g      1.2T    1.2T    -62G   106%    /anon-root
 /dev/ld0g      1.2T      0B    1.1T     0%    /anon-root
-/dev/ld0g      1.2T    250G    874G    22%    /anon-root
+/dev/ld0g      1.2T    250G    874G    23%    /anon-root
 /dev/ld0g      1.2T    749G    374G    67%    /anon-root
 /dev/ld0g      1.2T    1.2T    -62G   106%    /anon-root
-/dev/ld0g      1.2T    1.2T   -125G   111%    /anon-root
+/dev/ld0g      1.2T    1.2T   -125G   112%    /anon-root
 /dev/ld0g      1.2T      0B    1.0T     0%    /anon-root
 /dev/ld0g      1.2T    250G    811G    24%    /anon-root
 /dev/ld0g      1.2T    749G    312G    71%    /anon-root
 /dev/ld0g      1.2T    1.2T   -125G   112%    /anon-root
 /dev/ld0g      1.2T    1.2T   -187G   118%    /anon-root
-/dev/strpct     20T     10T     10T    50%    /strpct
-/dev/wd0e       10G    2.7G    7.3G    27%    /mount/windows/C
+/dev/strpct     20T     10T     10T    51%    /strpct
+/dev/wd0e       10G    2.7G    7.3G    28%    /mount/windows/C
 EOF
 	atf_check -s exit:0 -o file:expout -e empty \
 	    -x "BLOCKSIZE=1k $(atf_get_srcdir)/h_df -hn"