diff --git a/grains/osdisk.py b/grains/osdisk.py
new file mode 100644
index 0000000..4471f80
--- /dev/null
+++ b/grains/osdisk.py
@@ -0,0 +1,31 @@
+#!/usr/bin/env python
+import os
+
+def get_osdisk_stats():
+    '''
+    Calculates and returns the disk used, available and total capacity
+    in gigabytes. Calculations code from:
+    http://www.stealthcopter.com/blog/2009/09/python-diskspace/
+    '''
+    grains = {}
+    grains['osdisk'] = {}
+    disk = os.statvfs("/")
+
+    capacity = disk.f_bsize * disk.f_blocks
+    available = disk.f_bsize * disk.f_bavail
+    used = disk.f_bsize * (disk.f_blocks - disk.f_bavail)
+
+    # print information in bytes
+    #print used, available, capacity
+    # print information in Kilobytes
+    #print used/1024, available/1024, capacity/1024
+    # print information in Megabytes
+    #print used/1.048576e6, available/1.048576e6, capacity/1.048576e6
+    # print information in Gigabytes
+    #print used/1.073741824e9, available/1.073741824e9, capacity/1.073741824e9
+
+    grains['osdisk']['used'] = int(round(used/1.073741824e9))
+    grains['osdisk']['available'] = int(round(available/1.073741824e9))
+    grains['osdisk']['capacity'] = int(round(capacity/1.073741824e9))
+
+    return grains