diff --git a/lib/core.js b/lib/core.js
index 7e54d363..a9321955 100644
--- a/lib/core.js
+++ b/lib/core.js
@@ -38,6 +38,11 @@ module.exports = class Core {
     this.sessions = sessions
     this.globalCache = globalCache
 
+    this.stats = {
+      blocksAppended: 0,
+      bytesAppended: 0
+    }
+
     this._manifestFlushed = !!header.manifest
     this._maxOplogSize = 65536
     this._autoFlush = 1
@@ -684,6 +689,7 @@ module.exports = class Core {
         }
       }
 
+      const initByteLength = this.tree.byteLength
       const byteLength = await this._appendBlocks(values)
 
       await this.oplog.append([entry], false)
@@ -700,6 +706,11 @@ module.exports = class Core {
 
       if (this._shouldFlush()) await this._flushOplog()
 
+      this.stats.blocksAppended += values.length
+
+      const bytesInBatch = byteLength - initByteLength // Safe because we're in a mutex
+      this.stats.bytesAppended += bytesInBatch
+
       return { length: batch.length, byteLength }
     } finally {
       this._mutex.unlock()
diff --git a/test/basic.js b/test/basic.js
index 63eb7310..9ca825af 100644
--- a/test/basic.js
+++ b/test/basic.js
@@ -462,3 +462,13 @@ test('valid manifest passed to a session is stored', async function (t) {
 
   t.alike(b.manifest, core.manifest)
 })
+
+test('basic - core stats', async function (t) {
+  const core = await create()
+
+  await core.append('ok')
+  await core.append(['batch', 'here'])
+
+  t.is(core.core.stats.bytesAppended, 11, 'bytesAppended')
+  t.is(core.core.stats.blocksAppended, 3, 'blocksAppended')
+})