diff --git a/free-gigs b/free-gigs
new file mode 100755
index 0000000..7e1b566
--- /dev/null
+++ b/free-gigs
@@ -0,0 +1,20 @@
+#!/bin/bash
+# script-friendly df
+
+factor=1024  # default
+
+OPTSTRING="H"
+while getopts ${OPTSTRING} opt; do
+  case ${opt} in
+    H)
+      factor=1000
+      ;;
+  esac
+done
+shift $((OPTIND-1))
+
+target=${1:-.}
+
+free_bytes=$(findmnt --df -T "$target" -oAVAIL --bytes | sed '1d')
+free_gigs=$((free_bytes/(factor**3)))
+echo $free_gigs