diff --git a/tools/README.txt b/tools/README.txt
index 1fcac577c10..e8bb6135a36 100644
--- a/tools/README.txt
+++ b/tools/README.txt
@@ -688,6 +688,18 @@ refresh.sh
      refresh.sh will prompt you first to avoid overwriting the
      defconfig file with changes that you may not want.
 
+showsize.sh
+-----------
+
+  Show the top 10 biggest memory hogs in code and data spaces.  This
+  must be executed from the top-level NuttX directory like:
+
+    $ tools/showsize.sh
+    TOP 10 BIG DATA
+    ...
+    TOP 10 BIG CODE
+    ...
+
 testbuild.sh
 ------------
 
diff --git a/tools/showsize.sh b/tools/showsize.sh
new file mode 100644
index 00000000000..8a8bec7f1e3
--- /dev/null
+++ b/tools/showsize.sh
@@ -0,0 +1,67 @@
+#!/bin/bash
+############################################################################
+# tools/showsize.sh
+#
+#   Copyright (C) 2016 Gregory Nutt. All rights reserved.
+#   Author: Lorenz Meier
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# set -x
+
+# Host nm should always work
+#NM=arm-none-eabi-nm
+NM=nm
+
+# This should be executed from the top-level NuttX directory
+
+if [ ! -x "tools/showsize.sh" ]; then
+  echo "This script must executed from the top-level NuttX directory"
+  exit 1
+fi
+
+# On the cywin simulation, the executable will be nuttx.exe
+
+if [ -f "nuttx" ]; then
+  NUTTX=nuttx
+else
+  if [ -x "nuttx.exe" ]; then
+    NUTTX=nuttx.exe
+  else
+    echo "Cannot find the NuttX executable"
+    exit 1
+  fi
+fi
+
+
+echo "TOP 10 BIG DATA"
+$NM --print-size --size-sort --radix dec -C $NUTTX | grep ' [DdBb] ' | tail -20
+echo "TOP 10 BIG CODE"
+$NM --print-size --size-sort --radix dec -C $NUTTX | grep ' [TtWw] ' | tail -20