diff --git a/database_reports/20180607_subscriber_histories.js b/database_reports/20180607_subscriber_histories.js
new file mode 100644
index 0000000000..3acecacedf
--- /dev/null
+++ b/database_reports/20180607_subscriber_histories.js
@@ -0,0 +1,100 @@
+import max from 'lodash/max';
+import mean from 'lodash/mean';
+import monk from 'monk';
+import round from 'lodash/round';
+import sum from 'lodash/sum';
+
+/*
+ * Output data on subscribers' task histories, formatted for CSV.
+ * User ID,Count of Dailies,Count of Habits,Total History Size,Max History Size,Mean History Size,Median History Size
+ */
+const connectionString = 'mongodb://localhost:27017/habitrpg?auto_reconnect=true'; // FOR TEST DATABASE
+
+let dbUsers = monk(connectionString).get('users', { castIds: false });
+let dbTasks = monk(connectionString).get('tasks', { castIds: false });
+
+function usersReport () {
+  let allHistoryLengths = [];
+
+  console.info('User ID,Count of Dailies,Count of Habits,Total History Size,Max History Size,Mean History Size,Median History Size');
+
+  dbUsers.find(
+    {
+      $and:
+        [
+          {'purchased.plan.planId': {$ne:null}},
+          {'purchased.plan.planId': {$ne:''}},
+        ],
+      $or:
+        [
+          {'purchased.plan.dateTerminated': null},
+          {'purchased.plan.dateTerminated': ''},
+          {'purchased.plan.dateTerminated': {$gt:new Date()}},
+        ],
+    },
+    {
+      fields: {_id: 1},
+    }
+  ).each((user, {close, pause, resume}) => {
+    let historyLengths = [];
+    let habitCount = 0;
+    let dailyCount = 0;
+
+    pause();
+    return dbTasks.find(
+      {
+        userId: user._id,
+        $or:
+          [
+            {type: 'habit'},
+            {type: 'daily'},
+          ],
+      },
+      {
+        fields: {
+          type: 1,
+          history: 1,
+        },
+      }
+    ).each((task) => {
+      if (task.type === 'habit') {
+        habitCount++;
+      }
+      if (task.type === 'daily') {
+        dailyCount++;
+      }
+      if (task.history.length > 0) {
+        allHistoryLengths.push(task.history.length);
+        historyLengths.push(task.history.length);
+      }
+    }).then(() => {
+      const totalHistory = sum(historyLengths);
+      const maxHistory = historyLengths.length > 0 ? max(historyLengths) : 0;
+      const meanHistory = historyLengths.length > 0 ? round(mean(historyLengths)) : 0;
+      const medianHistory = historyLengths.length > 0 ? median(historyLengths) : 0;
+      console.info(`${user._id},${dailyCount},${habitCount},${totalHistory},${maxHistory},${meanHistory},${medianHistory}`);
+      resume();
+    });
+  }).then(() => {
+    console.info(`Total Subscriber History Entries: ${sum(allHistoryLengths)}`);
+    console.info(`Largest History Size: ${max(allHistoryLengths)}`);
+    console.info(`Mean History Size: ${round(mean(allHistoryLengths))}`);
+    console.info(`Median History Size: ${median(allHistoryLengths)}`);
+    return process.exit(0);
+  });
+}
+
+function median(values) { // https://gist.github.com/caseyjustus/1166258
+  values.sort( function(a,b) {return a - b;} );
+
+  var half = Math.floor(values.length/2);
+
+  if (values.length % 2) {
+    return values[half];
+  }
+  else {
+    return (values[half-1] + values[half]) / 2.0;
+  }
+}
+
+module.exports = usersReport;