diff --git a/bitcask.go b/bitcask.go
index 8f28878..02a6ef5 100644
--- a/bitcask.go
+++ b/bitcask.go
@@ -125,6 +125,10 @@ func (b *Bitcask) Scan(prefix string, f func(key string) error) error {
 	return nil
 }
 
+func (b *Bitcask) Len() int {
+	return b.keydir.Len()
+}
+
 func (b *Bitcask) Keys() chan string {
 	return b.keydir.Keys()
 }
diff --git a/bitcask_test.go b/bitcask_test.go
index c343f06..d1d542c 100644
--- a/bitcask_test.go
+++ b/bitcask_test.go
@@ -40,6 +40,10 @@ func TestAll(t *testing.T) {
 		assert.Equal([]byte("bar"), val)
 	})
 
+	t.Run("Len", func(t *testing.T) {
+		assert.Equal(1, db.Len())
+	})
+
 	t.Run("Has", func(t *testing.T) {
 		assert.True(db.Has("foo"))
 	})
diff --git a/internal/keydir.go b/internal/keydir.go
index 285d16b..1f60c4c 100644
--- a/internal/keydir.go
+++ b/internal/keydir.go
@@ -52,6 +52,10 @@ func (k *Keydir) Delete(key string) {
 	delete(k.kv, key)
 }
 
+func (k *Keydir) Len() int {
+	return len(k.kv)
+}
+
 func (k *Keydir) Keys() chan string {
 	ch := make(chan string)
 	go func() {