diff --git a/pybombs.sh b/pybombs.sh
index 542a256..3de75e6 100755
--- a/pybombs.sh
+++ b/pybombs.sh
@@ -14,8 +14,19 @@ function pybombs_mirror() {
 	cp ${PYBOMBS_MIRROR_SCRIPT_PATH}/ignore.urls ${TUNASYNC_WORKING_DIR}/
 	${PYBOMBS_MIRROR_SCRIPT_PATH}/pybombs-mirror.sh
 }
+function calculate_size() {
+	total_size=0
+	for repo in "${TUNASYNC_WORKING_DIR}"/git/*; do
+		sz=$(git -C "$repo" count-objects -v|grep -Po '(?<=size-pack: )\d+')
+		total_size=$(($total_size+1024*$sz))
+	done
+	sz=$(du -sb "${TUNASYNC_WORKING_DIR}/wget"|cut -f1)
+	total_size=$(($total_size+$sz))
+	echo "Total size is" $(numfmt --to=iec $total_size)
+}
 
 PYBOMBS_MIRROR_SCRIPT_PATH="${PYBOMBS_MIRROR_SCRIPT_PATH:-"/opt/pybombs-mirror"}"
 MIRROR_BASE_URL="${MIRROR_BASE_URL:-"https://pybombs.tuna.tsinghua.edu.cn"}"
 
 pybombs_mirror
+calculate_size