diff --git a/utils/disk.py b/utils/disk.py
index 808e14d..84c18b1 100644
--- a/utils/disk.py
+++ b/utils/disk.py
@@ -12,13 +12,13 @@ def get_disk_usage(path):
     try:
         stat_res = os.statvfs(path)
         total = stat_res.f_blocks * stat_res.f_bsize
-        free = stat_res.f_bfree * stat_res.f_bsize
+        free = stat_res.f_bavail * stat_res.f_bsize
         used = (stat_res.f_blocks - stat_res.f_bfree) * stat_res.f_bsize
 
         total_space = misc.bytes_to_string(total)
         free_space = misc.bytes_to_string(free)
         used_space = misc.bytes_to_string(used)
-        used_percent = "%.2f%%" % (100 * (float(used) / float(total)))
+        used_percent = "%.2f%%" % (100 * (float(used) / float(free+used)))
     except Exception:
         pass
     return total_space, used_space, used_percent, free_space