diff --git a/A00_Common/spreadsheet/spreadsheet_clipboard.ts b/A00_Common/spreadsheet/spreadsheet_clipboard.ts
index 45c514d4..93b3f1bc 100644
--- a/A00_Common/spreadsheet/spreadsheet_clipboard.ts
+++ b/A00_Common/spreadsheet/spreadsheet_clipboard.ts
@@ -405,6 +405,25 @@ export function parseClipboard(html: string, text: string, at: CellAddress): Cli
   return null;
 }
 
+const NO_FORMULA_NOTIFIED_KEY = "aislo-ss-notified-no-formula";
+
+/** 붙인 뭉치 어디에도 수식(`식`)이 없음 — 엑셀 HTML 클립보드는 「수식 표시」(Ctrl+`) 없이 복사하면
+ * 계산값만 실림(수식 자체는 절대 안 실림). */
+function hasNoFormula(block: ClipBlock): boolean {
+  return !Object.values(block.칸).some((cell) => cell.식 !== undefined);
+}
+
+/** 세션에 한 번만 — 엑셀에서 값만 온 붙여넣기마다 매번 뜨면 성가심. */
+function notifyNoFormulaOnce(): void {
+  try {
+    if (sessionStorage.getItem(NO_FORMULA_NOTIFIED_KEY)) return;
+    sessionStorage.setItem(NO_FORMULA_NOTIFIED_KEY, "1");
+  } catch {
+    // 세션 저장 안 되면 매번 뜰 수 있으나 치명적이지 않음.
+  }
+  showToast(st("ClipboardExcelNoFormula"));
+}
+
 /* ── 화면 붙임 — copy · cut · paste 사건 ────────────────────────────────── */
 
 function activeRange(ctx: SpreadsheetContext): CellRange {
@@ -525,6 +544,7 @@ export function attachClipboard(ctx: SpreadsheetContext): PartHandle {
       return;
     }
     ev.preventDefault();
+    if (block.출처 === "excel" && hasNoFormula(block)) notifyNoFormulaOnce();
     pasteBlock(ctx, block, at);
   }
 
diff --git a/A00_Common/spreadsheet/spreadsheet_text.ts b/A00_Common/spreadsheet/spreadsheet_text.ts
index 1928550f..a4230d36 100644
--- a/A00_Common/spreadsheet/spreadsheet_text.ts
+++ b/A00_Common/spreadsheet/spreadsheet_text.ts
@@ -103,6 +103,23 @@ const TEXT = {
   UnitGroup_op: ["연산·비교", "Operators"],
   UnitRecent: ["최근 씀", "Recently used"],
   UnitAsFormat: ["숫자 형식으로 붙이기", "Attach as number format"],
+  FormulaHint_label: [
+    "엑셀 수식까지: 엑셀에서 Ctrl+` → 복사 → 여기 Ctrl+V · 끝나면 엑셀 Ctrl+` 다시",
+    "Formulas too: in Excel Ctrl+` → copy → paste here (Ctrl+V) · then Ctrl+` again in Excel",
+  ],
+  FormulaHint_title: ["엑셀 수식까지 옮기는 법", "How to bring formulas along"],
+  FormulaHint_detail: [
+    "엑셀 Ctrl+` = 「수식 표시」 켜기 · 칸에 계산값 대신 「=...」 글이 그대로 보임. 그 상태로 복사해 " +
+      "여기 붙이면 수식까지 옮겨짐(그냥 복사하면 값만 옴 · 수식 없음). 붙인 뒤 엑셀에서 Ctrl+` 다시 " +
+      "눌러 원래대로.",
+    'Excel Ctrl+` turns on "Show Formulas" — cells show "=..." text instead of the computed ' +
+      "value. Copy in that state and paste here to bring the formulas along (a normal copy only " +
+      "brings values). Press Ctrl+` again in Excel afterward to switch back.",
+  ],
+  ClipboardExcelNoFormula: [
+    "값만 들어왔음 — 수식까지는 엑셀 Ctrl+` 뒤 복사",
+    "Only values came in — for formulas too, copy after Ctrl+` in Excel",
+  ],
 } as const;
 
 export function st(key: keyof typeof TEXT): string {
diff --git a/A00_Common/spreadsheet/spreadsheet_toolbar.css b/A00_Common/spreadsheet/spreadsheet_toolbar.css
index 214b2f33..89c2410e 100644
--- a/A00_Common/spreadsheet/spreadsheet_toolbar.css
+++ b/A00_Common/spreadsheet/spreadsheet_toolbar.css
@@ -145,6 +145,40 @@
   padding: 4px 2px;
 }
 
+.ss-toolbar__hint {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-end;
+  gap: 2px;
+  margin-left: auto;
+  max-width: 320px;
+}
+
+.ss-toolbar__formula-hint {
+  border: 0;
+  padding: 0;
+  background: none;
+  color: var(--color-text-muted);
+  font-size: 0.72rem;
+  text-align: right;
+  opacity: 0.6;
+  cursor: pointer;
+}
+
+.ss-toolbar__formula-hint:hover {
+  opacity: 1;
+}
+
+.ss-toolbar__formula-hint-detail {
+  color: var(--color-text-muted);
+  font-size: 0.68rem;
+  text-align: right;
+}
+
+.ss-toolbar__formula-hint-detail[hidden] {
+  display: none;
+}
+
 /* ── 시트 탭 ─────────────────────────────────────────────────────────────── */
 
 .ss-tabs {
diff --git a/A00_Common/spreadsheet/spreadsheet_toolbar.ts b/A00_Common/spreadsheet/spreadsheet_toolbar.ts
index 90577706..3518e51e 100644
--- a/A00_Common/spreadsheet/spreadsheet_toolbar.ts
+++ b/A00_Common/spreadsheet/spreadsheet_toolbar.ts
@@ -452,6 +452,26 @@ export function mountToolbar(ctx: SpreadsheetContext): PartHandle {
   };
   document.addEventListener("click", closeUnitPop);
 
+  // ── 엑셀 수식 복사 안내(오른쪽 위 흐린 글씨 · 누르면 두세 줄 설명) ─────────
+  const formulaHintBtn = el("button", {
+    className: "ss-toolbar__formula-hint",
+    attrs: { type: "button", title: st("FormulaHint_title") },
+    text: st("FormulaHint_label"),
+  });
+  const formulaHintDetail = el("div", {
+    className: "ss-toolbar__formula-hint-detail",
+    attrs: { hidden: "true" },
+    text: st("FormulaHint_detail"),
+  });
+  formulaHintBtn.addEventListener("click", (ev) => {
+    ev.stopPropagation();
+    formulaHintDetail.hidden = !formulaHintDetail.hidden;
+  });
+  const formulaHint = el("div", {
+    className: "ss-toolbar__hint",
+    children: [formulaHintBtn, formulaHintDetail],
+  });
+
   root.append(
     group(undoBtn, redoBtn),
     group(fontInput, sizeInput),
@@ -462,6 +482,7 @@ export function mountToolbar(ctx: SpreadsheetContext): PartHandle {
     group(borderBtn, borderPop),
     group(numfmtInput),
     group(unitBtn, unitPop),
+    formulaHint,
   );
 
   function refresh(): void {