diff --git a/runtime/vm/clustered_snapshot.cc b/runtime/vm/clustered_snapshot.cc
index 396e6ad3417..d8ae13404be 100644
--- a/runtime/vm/clustered_snapshot.cc
+++ b/runtime/vm/clustered_snapshot.cc
@@ -5307,21 +5307,29 @@ void FullSnapshotWriter::WriteFullSnapshot() {
 
   WriteIsolateFullSnapshot(num_base_objects);
 
+  if (FLAG_print_snapshot_sizes) {
+    OS::Print("VMIsolate(CodeSize): %" Pd "\n", VmIsolateSnapshotSize());
+    OS::Print("Isolate(CodeSize): %" Pd "\n", IsolateSnapshotSize());
+  }
+  intptr_t total_size = VmIsolateSnapshotSize() + IsolateSnapshotSize();
+
   if (Snapshot::IncludesCode(kind_)) {
     instructions_writer_->Write(
         *vm_isolate_snapshot_buffer_, vm_isolate_snapshot_size_,
         *isolate_snapshot_buffer_, isolate_snapshot_size_);
 
-    OS::Print("VMIsolate(CodeSize): %" Pd "\n", VmIsolateSnapshotSize());
-    OS::Print("Isolate(CodeSize): %" Pd "\n", IsolateSnapshotSize());
-    OS::Print("ReadOnlyData(CodeSize): %" Pd "\n",
-              instructions_writer_->data_size());
-    OS::Print("Instructions(CodeSize): %" Pd "\n",
-              instructions_writer_->text_size());
-    intptr_t total = VmIsolateSnapshotSize() + IsolateSnapshotSize() +
-                     instructions_writer_->data_size() +
-                     instructions_writer_->text_size();
-    OS::Print("Total(CodeSize): %" Pd "\n", total);
+    if (FLAG_print_snapshot_sizes) {
+      OS::Print("ReadOnlyData(CodeSize): %" Pd "\n",
+                instructions_writer_->data_size());
+      OS::Print("Instructions(CodeSize): %" Pd "\n",
+                instructions_writer_->text_size());
+    }
+    total_size +=
+        instructions_writer_->data_size() + instructions_writer_->text_size();
+  }
+
+  if (FLAG_print_snapshot_sizes) {
+    OS::Print("Total(CodeSize): %" Pd "\n", total_size);
   }
 }
 
diff --git a/runtime/vm/flag_list.h b/runtime/vm/flag_list.h
index 94c0425f661..7c1a288bda3 100644
--- a/runtime/vm/flag_list.h
+++ b/runtime/vm/flag_list.h
@@ -122,6 +122,8 @@
     "Polymorphic calls with deoptimization / megamorphic call")                \
   P(precompiled_mode, bool, false, "Precompilation compiler mode")             \
   C(precompiled_runtime, true, false, bool, false, "Precompiled runtime mode") \
+  R(print_snapshot_sizes, false, bool, false,                                  \
+    "Print sizes of generated snapshots.")                                     \
   R(print_ssa_liveranges, false, bool, false,                                  \
     "Print live ranges after allocation.")                                     \
   C(print_stop_message, false, false, bool, false, "Print stop message.")      \