diff --git a/B08_Quantity/B08_Quantity_Router_Earthwork.py b/B08_Quantity/B08_Quantity_Router_Earthwork.py
index 842db03c..0f64e5c1 100644
--- a/B08_Quantity/B08_Quantity_Router_Earthwork.py
+++ b/B08_Quantity/B08_Quantity_Router_Earthwork.py
@@ -45,6 +45,10 @@ from B08_Quantity.B08_Quantity_Engine_Handoff import load_mapping
 from B08_Quantity.B08_Quantity_Engine_HaulSummary import build_table as build_haul_table
 from B08_Quantity.B08_Quantity_Engine_HaulSummary import check_against_plan, summary_input_rows
 from B08_Quantity.B08_Quantity_Engine_RockSplit import apply_rock_split
+from B08_Quantity.B08_Quantity_Router_Earthwork_HaulPlan import HAUL_PLAN_KEYS
+from B08_Quantity.B08_Quantity_Router_Earthwork_HaulPlan import (
+    recompute_haul_plan as _recompute_haul_plan,
+)
 from B08_Quantity.B08_Quantity_Engine_Preparation import build_table as build_preparation_table
 from B08_Quantity.B08_Quantity_Engine_SlopeArea import build_table as build_slope_table
 from B08_Quantity.B08_Quantity_Engine_SlopeLength import road_surface_area, station_slopes
@@ -626,6 +630,7 @@ async def save_quantity_settings(project_id: UUID, body: QuantitySettingsBody) -
             for name, method in values["rock_methods"].items()
             if method in ROCK_METHODS
         }
+    before = {key: quantity_settings(root).get(key) for key in HAUL_PLAN_KEYS}
     try:
         # ⚠ 고른 값을 **되돌릴 수 있어야** 하는 칸은 통째로 갈아 끼운다 — 병합이면
         #   「안 정함」으로 되돌아가지 않는다(2026-09-07 화면에서 걸린 자리).
@@ -653,7 +658,16 @@ async def save_quantity_settings(project_id: UUID, body: QuantitySettingsBody) -
             status_code=500,
             content={"status": "error", "message": "산출 조건을 저장하지 못했습니다."},
         )
-    return JSONResponse(content={"status": "success", "quantity": saved.get("quantity") or {}})
+    after = quantity_settings(root)
+    changed = any(before[key] != after.get(key) for key in HAUL_PLAN_KEYS)
+    recomputed = await _recompute_haul_plan(project_id) if changed else False
+    return JSONResponse(
+        content={
+            "status": "success",
+            "quantity": saved.get("quantity") or {},
+            "haul_plan_recomputed": recomputed,
+        }
+    )
 
 
 def _save_quantity(
diff --git a/B08_Quantity/B08_Quantity_Router_Earthwork_HaulPlan.py b/B08_Quantity/B08_Quantity_Router_Earthwork_HaulPlan.py
new file mode 100644
index 00000000..e392c850
--- /dev/null
+++ b/B08_Quantity/B08_Quantity_Router_Earthwork_HaulPlan.py
@@ -0,0 +1,40 @@
+"""산출 조건 [저장] 뒤 **운반계획 다시 세우기** — 2026-09-14 브레인 ②(지침 5장).
+
+구성비·시공법·계수·도쟈 한계거리는 B06 유토곡선(운반계획)의 밑수다. B08 [저장]이 계획을 다시 안 세우면
+B06 을 다시 저장하기 전까지 토적표(새 계수) ↔ 운반표(옛 계획)가 갈린다(계수 칸은 전부터 같은 틈).
+⇒ 그 칸이 **바뀐 저장**만 B06 [저장]과 같은 서버 재계산을 부른다(무거워서 다른 칸 저장은 안 부름).
+본 라우터(`B08_Quantity_Router_Earthwork.py`)가 700줄에 닿아 이 파일로 뗌.
+"""
+
+from __future__ import annotations
+
+import logging
+from uuid import UUID
+
+from B06_Section.B06_Section_Repository import get_workflow_route_context
+from config.config_db import run_with_connection
+
+logger = logging.getLogger(__name__)
+
+#: 운반계획의 밑수가 되는 산출 조건 칸.
+HAUL_PLAN_KEYS = (
+    "rock_class_set",
+    "rock_classes",
+    "rock_ratios_pct",
+    "rock_methods",
+    "conversion_factors_override",
+    "dozer_haul_limit_m",
+)
+
+
+async def recompute_haul_plan(project_id: UUID) -> bool:
+    """B06 [저장]과 같은 서버 재계산 — 못 하면 저장은 살리고 거짓(화면이 옛 계획임을 앎)."""
+    from B06_Section.B06_Section_Server_Calc_Prebuild import recompute_server_side
+
+    try:
+        context = await run_with_connection(get_workflow_route_context, project_id)
+        route_id = int((context or {}).get("route_id") or 0)
+        return bool(route_id) and await recompute_server_side(project_id, route_id) >= 0
+    except Exception:
+        logger.exception("B08 저장 뒤 운반계획 재계산 실패: project_id=%s", project_id)
+        return False
diff --git a/resources/tester/test_b08_settings_recompute_haul.py b/resources/tester/test_b08_settings_recompute_haul.py
new file mode 100644
index 00000000..0975d9e9
--- /dev/null
+++ b/resources/tester/test_b08_settings_recompute_haul.py
@@ -0,0 +1,64 @@
+"""산출 조건 [저장]이 운반계획을 다시 세움 — 2026-09-14 브레인 ②(지침 5장 「[저장]·[확정]은 서버가 정본으로 다시 계산」).
+
+구성비·시공법·계수·도쟈 한계거리는 B06 유토곡선(운반계획)의 밑수인데 B08 [저장]이 운반계획을 다시 안 셈
+→ B06 을 다시 저장하기 전까지 토적표(새 계수) ↔ 운반표(옛 계획)가 갈렸음(계수 칸은 전부터 같은 틈).
+⇒ 그 칸이 **바뀐 저장**만 서버 재계산(`recompute_server_side`)을 부름 · 다른 칸 저장은 안 부름(무거움).
+"""
+
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+import pytest
+from fastapi import FastAPI
+from fastapi.testclient import TestClient
+
+ROOT = Path(__file__).resolve().parents[2]
+sys.path.insert(0, str(ROOT))
+
+import B08_Quantity.B08_Quantity_Router_Earthwork as earthwork_router  # noqa: E402
+
+PROJECT_ID = "56565656-5656-5656-5656-565656565656"
+URL = f"/api/projects/{PROJECT_ID}/quantity/settings"
+
+
+@pytest.fixture()
+def calls(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> tuple[TestClient, list]:
+    recorded: list = []
+
+    async def fake_run(func, *args):
+        return "project"
+
+    async def fake_recompute(project_id):
+        recorded.append(str(project_id))
+        return True
+
+    monkeypatch.setattr(earthwork_router, "run_with_connection", fake_run)
+    monkeypatch.setattr(earthwork_router, "resolve_stored_project_path", lambda _p: str(tmp_path))
+    monkeypatch.setattr(earthwork_router, "_recompute_haul_plan", fake_recompute)
+    app = FastAPI()
+    app.include_router(earthwork_router.router)
+    return TestClient(app), recorded
+
+
+def test_운반계획_밑수가_바뀐_저장만_재계산(calls) -> None:
+    client, recorded = calls
+    ratios = {"rock_ratios_pct": {"연암": 60, "보통암": 40}}
+    first = client.put(URL, json=ratios)
+    assert first.status_code == 200 and first.json()["haul_plan_recomputed"] is True
+    assert recorded == [PROJECT_ID]
+    # 같은 값을 다시 저장 — 안 부름
+    assert client.put(URL, json=ratios).json()["haul_plan_recomputed"] is False
+    # 운반계획과 무관한 칸 — 안 부름
+    assert (
+        client.put(URL, json={"topsoil_thickness_m": 0.2}).json()["haul_plan_recomputed"] is False
+    )
+    assert len(recorded) == 1
+    for body in (
+        {"rock_methods": {"연암": "ripping"}},
+        {"conversion_factors_override": {"soil": {"compacted": 0.85}}},
+        {"dozer_haul_limit_m": 70},
+    ):
+        assert client.put(URL, json=body).json()["haul_plan_recomputed"] is True, body
+    assert len(recorded) == 4