diff --git a/app/core/chunk_config.py b/app/core/chunk_config.py
new file mode 100644
index 0000000..6780b5d
--- /dev/null
+++ b/app/core/chunk_config.py
@@ -0,0 +1,13 @@
+TYPE_SIZES = {
+    "thought":   {"target": (150, 250), "max": 300, "overlap": (30, 40)},
+    "experience":{"target": (250, 350), "max": 450, "overlap": (40, 60)},
+    "journal":   {"target": (200, 300), "max": 400, "overlap": (30, 50)},
+    "task":      {"target": (120, 200), "max": 250, "overlap": (20, 30)},
+    "project":   {"target": (300, 450), "max": 600, "overlap": (50, 70)},
+    "concept":   {"target": (250, 400), "max": 550, "overlap": (40, 60)},
+    "source":    {"target": (200, 350), "max": 500, "overlap": (30, 50)},
+}
+DEFAULT = {"target": (250, 350), "max": 500, "overlap": (40, 60)}
+
+def get_sizes(note_type: str):
+    return TYPE_SIZES.get(str(note_type).lower(), DEFAULT)