diff --git a/radio/util/checksize.py b/radio/util/checksize.py
new file mode 100644
index 000000000..6cc194f61
--- /dev/null
+++ b/radio/util/checksize.py
@@ -0,0 +1,51 @@
+#!/usr/bin/env python
+
+import os
+import sys
+import subprocess
+
+index = -1
+size = None
+
+options = sys.argv[1:]
+srcdir = os.path.dirname(os.path.realpath(__file__)) + "/../.."
+buildir = os.getcwd()
+
+while 1:
+    sys.stdout.flush()
+    index += 1
+
+    os.chdir(srcdir)
+    cmd = ["git", "reset", "--hard", "origin/next~%d" % index]
+    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    output, error = proc.communicate()
+    if proc.returncode != 0:
+        print "HEAD~%d git reset failed" % index
+        continue
+
+    os.chdir(buildir)
+    cmd = ["cmake"] + options + [srcdir]
+    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    output, error = proc.communicate()
+    if proc.returncode != 0:
+        print "HEAD~%d cmake failed" % index
+        continue
+
+    cmd = ["make", "-j4", "firmware"]
+    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    output, error = proc.communicate()
+    if proc.returncode != 0:
+        print "HEAD~%d make firmware failed" % index
+        continue
+
+    oldsize = int(subprocess.check_output('avr-size -A %s | grep Total | cut -f2- -d " "' % "firmware.hex", shell=True))
+    if size:
+        if size > oldsize:
+            print "HEAD~%d %d: increase by %d bytes" % (index-1, size, size-oldsize)
+        elif size < oldsize:
+            print "HEAD~%d %d: decrease by %d bytes" % (index-1, size, oldsize-size)
+        else:
+            print "HEAD~%d %d" % (index-1, size)
+    size = oldsize
+
+