diff --git a/src/core/rebar/quantity.ts b/src/core/rebar/quantity.ts
index 1224184..3bd50aa 100644
--- a/src/core/rebar/quantity.ts
+++ b/src/core/rebar/quantity.ts
@@ -19,9 +19,13 @@ export interface QuantityLine {
   name: string;
   size: string;
   member: RebarRow['member'];
+  /** 개수 as in the 철근표 row (bars; for P1 each bar is several pieces). */
   count: number;
-  /** Length of one bar (mm). */
-  length: number;
+  /** Pieces in the row: the sum of the piece counts (C9 108 = 18 positions × 6 pieces). */
+  pieceCount: number;
+  /** Length of one bar (mm), or null when the row has several lengths (see pieces). */
+  length: number | null;
+  pieces: { length: number; count: number }[];
   /** Total length (m) = count × length. */
   totalM: number;
   kgPerM: number;
@@ -67,15 +71,21 @@ export function buildQuantity(rows: RebarRow[], material: Material): Quantity {
       continue;
     }
     if (!isBarSize(r.size)) continue;
-    if (r.length === null) {
+    // A row with several lengths carries pieces; a row with one length is one piece (count bars of that length).
+    const pieces = r.pieces ?? (r.length === null ? null : [{ length: r.length, count: r.count }]);
+    if (!pieces) {
       missing.push(r.name);
       continue;
     }
     const grade = fyOf(material, r.size);
     const dMm = NOMINAL_DIAMETER[r.size];
     const kgPerM = unitWeight(dMm);
-    const totalM = (r.count * r.length) / 1000;
-    const line: QuantityLine = { name: r.name, size: r.size, member: r.member, count: r.count, length: r.length, totalM, kgPerM, kg: totalM * kgPerM, shape: r.shape };
+    const pieceCount = pieces.reduce((s, p) => s + p.count, 0);
+    const totalM = pieces.reduce((s, p) => s + (p.count * p.length) / 1000, 0);
+    const line: QuantityLine = {
+      name: r.name, size: r.size, member: r.member, count: r.count, pieceCount,
+      length: pieces.length === 1 ? pieces[0].length : null, pieces, totalM, kgPerM, kg: totalM * kgPerM, shape: r.shape,
+    };
     const diameters = byGrade.get(grade) ?? new Map<string, QuantityDiameter>();
     const d = diameters.get(r.size) ?? { size: r.size, dMm, lines: [], totalM: 0, kg: 0 };
     d.lines.push(line);
@@ -103,7 +113,7 @@ export function quantityRows(q: Quantity): (string | number)[][] {
   for (const g of q.groups) {
     for (const d of g.diameters) {
       for (const l of d.lines) {
-        out.push([`SD${g.grade}`, l.name, l.shape, l.size, l.count, l.length, round(l.totalM), round(l.kgPerM, 3), round(l.kg)]);
+        out.push([`SD${g.grade}`, l.name, l.shape, l.size, l.count, l.length ?? '여러 길이', round(l.totalM), round(l.kgPerM, 3), round(l.kg)]);
       }
       out.push(['', `${d.size} 소계`, '', d.size, '', '', round(d.totalM), '', round(d.kg)]);
     }
diff --git a/src/core/rebar/summary.ts b/src/core/rebar/summary.ts
index 2839386..c88dbb9 100644
--- a/src/core/rebar/summary.ts
+++ b/src/core/rebar/summary.ts
@@ -15,7 +15,10 @@ export interface RebarRow {
   name: string;
   size: string;
   count: number;
+  /** One length (mm) when the row has a single length; null when the row has several (see pieces). */
   length: number | null;
+  /** Lengths of the bars in this row, as pieces: count bars of length (mm). Their sum is the row's total (재료표). */
+  pieces?: { length: number; count: number }[];
   note: string;
   /** 간격 (설계 간격, mm or text), 실간격 (cycle 묶음 기준), 위치, 방향, 형상, 근거. */
   spacing: string;
@@ -170,11 +173,16 @@ export function rebarSummary(
   };
   const shearNote = (label: string, xs: number[]) =>
     `${label}, 하부 U ${uRange(xs)}, 삿갓 ${capRange(xs)} (l_cap 추천안, Q-K5), 조각 ${xs.length * PIECES_PER_POSITION}`;
-  rows.push({ member: 'coping', name: 'C9', size: 'H25', count: shear.c9.length, length: null, note: shearNote('전단 좌 @250', shear.c9) });
-  rows.push({ member: 'coping', name: 'C10', size: 'H25', count: shear.c10.length, length: null, note: shearNote('전단 Level @300', shear.c10) });
-  rows.push({ member: 'coping', name: 'C11', size: 'H25', count: shear.c11.length, length: null, note: shearNote('전단 우 @250', shear.c11) });
+  // Each position has three 폐합, each with one 하부 U and one 삿갓 (6 pieces). Pieces: U and 삿갓 lengths at each position.
+  const loopPieces = (xs: number[]) => xs.flatMap((x) => [
+    { length: shearULength(x, L), count: 3 },
+    { length: capLength(x, L), count: 3 },
+  ]);
+  rows.push({ member: 'coping', name: 'C9', size: 'H25', count: shear.c9.length, length: null, pieces: loopPieces(shear.c9), note: shearNote('전단 좌 @250', shear.c9) });
+  rows.push({ member: 'coping', name: 'C10', size: 'H25', count: shear.c10.length, length: null, pieces: loopPieces(shear.c10), note: shearNote('전단 Level @300', shear.c10) });
+  rows.push({ member: 'coping', name: 'C11', size: 'H25', count: shear.c11.length, length: null, pieces: loopPieces(shear.c11), note: shearNote('전단 우 @250', shear.c11) });
   if (shear.between.length > 0) {
-    rows.push({ member: 'coping', name: 'C9·C11 사이', size: 'H25', count: shear.between.length, length: null, note: `기둥 사이, 양쪽 C10에서 안쪽으로 (추천안, Q-K2), 조각 ${shear.between.length * PIECES_PER_POSITION}` });
+    rows.push({ member: 'coping', name: 'C9·C11 사이', size: 'H25', count: shear.between.length, length: null, pieces: loopPieces(shear.between), note: `기둥 사이, 양쪽 C10에서 안쪽으로 (추천안, Q-K2), 조각 ${shear.between.length * PIECES_PER_POSITION}` });
   }
   if (nCol > 1) {
     warnings.push({ code: 'RB-M01', message: `다주형 ${nCol}기둥: C14는 T형 기준으로 두었습니다 (기둥마다 반복 규칙 미정, Q-K11).`, target: 'coping' });
@@ -183,8 +191,10 @@ export function rebarSummary(
   const side = copingSideBars(model.copingL * 1000, 41.288, 42.538);
   const hook = model.copingB * 1000 - 2 * 127 + 2 * SIDE_HOOK_LEG; // ㄷ body across the width + two legs
   const c12Range = side.c12.length ? `${Math.round(side.c12[0].straight)}–${Math.round(side.c12[side.c12.length - 1].straight)}` : '—';
-  rows.push({ member: 'coping', name: 'C12', size: 'H25', count: 4 * side.c12.length, length: null, note: `측면, 경사 하면에서 끊김, 일자 ${c12Range} (${2 * side.c12.length}) · ㄷ ${Math.round(hook)} (${2 * side.c12.length})` });
-  rows.push({ member: 'coping', name: 'C13', size: 'H25', count: 4 * side.c13.length, length: side.c13.length ? side.c13[0].straight : null, note: `측면, 끝면까지, 일자 (${2 * side.c13.length}) · ㄷ ${Math.round(hook)} (${2 * side.c13.length})` });
+  // Per bar: 2 일자 (straight) and 2 ㄷ (hook body + legs), so 4 bars per row position.
+  const sidePieces = (bars: { straight: number }[]) => bars.flatMap((b) => [{ length: b.straight, count: 2 }, { length: hook, count: 2 }]);
+  rows.push({ member: 'coping', name: 'C12', size: 'H25', count: 4 * side.c12.length, length: null, pieces: sidePieces(side.c12), note: `측면, 경사 하면에서 끊김, 일자 ${c12Range} (${2 * side.c12.length}) · ㄷ ${Math.round(hook)} (${2 * side.c12.length})` });
+  rows.push({ member: 'coping', name: 'C13', size: 'H25', count: 4 * side.c13.length, length: null, pieces: sidePieces(side.c13), note: `측면, 끝면까지, 일자 (${2 * side.c13.length}) · ㄷ ${Math.round(hook)} (${2 * side.c13.length})` });
   // C14 / C15 / C16 are derived from the model (코핑철근.md §7–8); the document's 38 / 11 / 22 and 3852 / 4070 / 4069 are checked in the tests.
   const L14 = model.copingL * 1000;
   const c14 = c14Bars(L14, model.copingRefTop, [...side.c12, ...side.c13], (x) => undersideAt(L14, x, model.endBottom, model.levelBottom));
@@ -197,8 +207,8 @@ export function rebarSummary(
 
   // Column (기둥철근.md · plan C4), P1 defaults
   const col = columnRebar(COLUMN_P1, mColumn);
-  rows.push({ member: 'column', name: 'P1', size: 'S32', count: col.mainP1, length: null, note: `외측 r ${col.r1}, 마디 ${col.p1Pieces.join(' / ')} (첫 마디에 갈고리 ${col.p1Hook}, 기둥철근.md §3.2)` });
-  rows.push({ member: 'column', name: 'P2', size: 'S32', count: col.mainP2, length: null, note: `내측 r ${col.r2}, 마디 ${col.p2Pieces.join(' / ')}` });
+  rows.push({ member: 'column', name: 'P1', size: 'S32', count: col.mainP1, length: null, pieces: col.p1Pieces.map((length) => ({ length, count: col.mainP1 })), note: `외측 r ${col.r1}, 마디 ${col.p1Pieces.join(' / ')} (첫 마디에 갈고리 ${col.p1Hook}, 기둥철근.md §3.2)` });
+  rows.push({ member: 'column', name: 'P2', size: 'S32', count: col.mainP2, length: null, pieces: col.p2Pieces.map((length) => ({ length, count: col.mainP2 })), note: `내측 r ${col.r2}, 마디 ${col.p2Pieces.join(' / ')}` });
   rows.push({ member: 'column', name: '주철근 커플러', size: 'D32용 (L150 Ø60)', count: col.couplers, length: 150, note: '@3000, P2는 +150 mm 상향 엇갈림' });
   const tieCouplerCount = col.p5Count + col.p4Count * 2;
   rows.push({ member: 'column', name: '띠철근 커플러', size: 'D19용 (L100 Ø40)', count: tieCouplerCount, length: 100, note: `단부 P5 1개(${col.p5Count}) · 기초안 P4 2개(${col.p4Count * 2}) 폐합용` });
diff --git a/src/main.ts b/src/main.ts
index d9eda0c..025e540 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -14,7 +14,7 @@ import { rebarSummary, type RebarRow } from './core/rebar/summary';
 import { shearSegments } from './core/rebar/coping';
 import { buildRebar3D, type RebarColorMode, type RebarScene } from './view/rebar3d';
 import { DEFAULT_MATERIAL, FCK_MEMBERS, fyOf, GRADE_CHOICES, isAssumedMaterial, materialFrom, type BendFactors, type FckByMember, type FckMember, type GradeKey, type Material } from './core/rebar/common';
-import { buildQuantity, quantityRows, type Quantity } from './core/rebar/quantity';
+import { buildQuantity, quantityRows, type Quantity, type QuantityLine } from './core/rebar/quantity';
 import { allVisibleChecked, setVisibleChecked, type TypeFilter } from './core/selection';
 import { choose, defaultSummary, isSelectable, SHAPE_GROUPS, UNDEFINED_REASON, type MemberId } from './core/shape-options';
 import { parseProject, SCHEMA_VERSION, serializeProject, type ProjectFile, type ProjectInfo } from './core/project';
@@ -890,7 +890,7 @@ function renderRebar(): void {
       el('td', r.position),
       el('td', r.direction),
       el('td', r.shape),
-      el('td', r.length === null ? '—' : String(Math.round(r.length * 10) / 10)),
+      el('td', r.length === null ? (r.pieces ? '여러 길이' : '—') : String(Math.round(r.length * 10) / 10), undefined),
       el('td', String(r.count)),
       basisCell(r.basis),
       el('td', r.note),
@@ -980,6 +980,14 @@ function quantityTargets(): Pier[] {
   return active?.model ? [active] : [];
 }
 
+/** Length cell of a 재료표 line: the length, or 여러 길이 with the pieces on hover. */
+function lengthCell(l: QuantityLine): HTMLTableCellElement {
+  if (l.length !== null) return el('td', String(l.length));
+  const cell = el('td', `여러 길이 (${l.pieces.length}종)`);
+  cell.title = l.pieces.map((p) => `${Math.round(p.length)} × ${p.count}`).join(' · ');
+  return cell;
+}
+
 function quantityTable(q: Quantity): HTMLTableElement {
   const table = el('table', undefined, 'grid-table rebar-table');
   const head = el('thead');
@@ -993,7 +1001,7 @@ function quantityTable(q: Quantity): HTMLTableElement {
       for (const l of d.lines) {
         body.appendChild(el('tr')).append(
           el('td', `SD${g.grade}`), el('td', l.name, 'bar-no'), el('td', l.shape), el('td', l.size), el('td', String(l.count)),
-          el('td', String(l.length)), el('td', l.totalM.toFixed(1)), el('td', l.kgPerM.toFixed(3)), el('td', l.kg.toFixed(1)),
+          lengthCell(l), el('td', l.totalM.toFixed(1)), el('td', l.kgPerM.toFixed(3)), el('td', l.kg.toFixed(1)),
         );
       }
       body.appendChild(el('tr', undefined, 'subtotal')).append(el('td', ''), el('td', `${d.size} 소계`), el('td', ''), el('td', d.size), el('td', ''), el('td', ''), el('td', d.totalM.toFixed(1)), el('td', ''), el('td', d.kg.toFixed(1)));
@@ -1011,7 +1019,7 @@ function renderQuantityScreen(): void {
   const targets = quantityTargets();
   $('step4-status').textContent = targets.length ? `${targets.length}기` : '예정';
   $('quantity-note').textContent = targets.length
-    ? `${targets.length}기 · 할증 ${state.material.waste}% (기본 0%, 가정). 체크한 교각 기준이고, 체크가 없으면 현재 교각입니다.`
+    ? `${targets.length}기 · 할증 ${state.material.waste}% (기본 0%, 가정). 삿갓 길이는 h − 100으로 가정(Q-K5). 체크한 교각 기준이고, 체크가 없으면 현재 교각입니다.`
     : '계산된 교각이 없습니다. 교각을 생성하세요.';
   let kg = 0;
   let kgWithWaste = 0;
diff --git a/tests/rebar-pieces.test.ts b/tests/rebar-pieces.test.ts
new file mode 100644
index 0000000..352631e
--- /dev/null
+++ b/tests/rebar-pieces.test.ts
@@ -0,0 +1,47 @@
+import { describe, expect, it } from 'vitest';
+import { buildPier } from '../src/core/geometry';
+import { DEFAULT_MATERIAL } from '../src/core/rebar/common';
+import { buildQuantity } from '../src/core/rebar/quantity';
+import { rebarSummary, type RebarRow } from '../src/core/rebar/summary';
+import { loadP1 } from './helpers';
+
+const rows = rebarSummary(buildPier(loadP1())).rows;
+const row = (name: string): RebarRow => rows.find((r) => r.name === name)!;
+const total = (r: RebarRow) => r.pieces!.reduce((s, p) => s + p.count * p.length, 0);
+const bars = (r: RebarRow) => r.pieces!.reduce((s, p) => s + p.count, 0);
+const hasLength = (r: RebarRow, mm: number, tol = 3) => r.pieces!.some((p) => Math.abs(p.length - mm) < tol);
+
+describe('조각 길이 (승인 2026-10-23): 여러 길이를 가진 행', () => {
+  it('C9 and C11 pieces: U (3522 first, 6098 last) and 삿갓, 3 loops each; 108 bars per row', () => {
+    for (const name of ['C9', 'C11']) {
+      expect(row(name).pieces, name).toBeDefined();
+      expect(bars(row(name)), name).toBe(108);
+      expect(hasLength(row(name), 3522), name).toBe(true);
+      expect(hasLength(row(name), 6098), name).toBe(true);
+    }
+  });
+
+  it('C10 pieces: outer U 6249 and Level U 6340; 54 bars', () => {
+    expect(bars(row('C10'))).toBe(54);
+    expect(hasLength(row('C10'), 6249)).toBe(true);
+    expect(hasLength(row('C10'), 6340)).toBe(true);
+  });
+
+  it('C12 and C13 pieces: the bars per row equal the row count (4 per position)', () => {
+    expect(bars(row('C12'))).toBe(row('C12').count);
+    expect(bars(row('C13'))).toBe(row('C13').count);
+    expect(total(row('C12'))).toBeGreaterThan(0);
+  });
+
+  it('P1 and P2 pieces: each splice piece counts all the bars (230)', () => {
+    expect(row('P1').pieces!.every((p) => p.count === 230)).toBe(true);
+    expect(row('P2').pieces!.every((p) => p.count === 230)).toBe(true);
+    expect(row('P1').pieces!.length).toBeGreaterThan(1);
+  });
+
+  it('the 재료표 no longer leaves out any P1 bar: no missing bars', () => {
+    const q = buildQuantity(rows, DEFAULT_MATERIAL);
+    expect(q.missing).toEqual([]);
+    expect(q.groups.flatMap((g) => g.diameters.flatMap((d) => d.lines.map((l) => l.name)))).toEqual(expect.arrayContaining(['C9', 'C10', 'C11', 'C12', 'P1', 'P2']));
+  });
+});
diff --git a/tests/rebar-quantity.test.ts b/tests/rebar-quantity.test.ts
index 1687a8d..d4b8b5e 100644
--- a/tests/rebar-quantity.test.ts
+++ b/tests/rebar-quantity.test.ts
@@ -22,11 +22,10 @@ describe('철근재료표 (승인 2026-10-23)', () => {
     }
   });
 
-  it('bars with no length yet are listed as missing and kept out of the totals', () => {
+  it('a row with several lengths is totalled from its pieces, not left out', () => {
     const q = buildQuantity(rows, DEFAULT_MATERIAL);
-    expect(q.missing).toContain('C9');
-    expect(q.missing).toContain('C11');
-    expect(q.groups.flatMap((g) => g.diameters.flatMap((d) => d.lines.map((l) => l.name)))).not.toContain('C9');
+    expect(q.missing).toEqual([]);
+    expect(q.groups.flatMap((g) => g.diameters.flatMap((d) => d.lines.map((l) => l.name)))).toContain('C9');
   });
 
   it('couplers are counted, not weighed', () => {
diff --git a/tests/rebar-summary.test.ts b/tests/rebar-summary.test.ts
index 7fa1d74..dce33b3 100644
--- a/tests/rebar-summary.test.ts
+++ b/tests/rebar-summary.test.ts
@@ -53,7 +53,8 @@ describe('③ 철근표 요약 (P1)', () => {
   });
 
   it('lengths from the documents: C13 11746, C14 3447.5, C15 3852, C16 4070, P3 ≈ C_t + 1.3·l_d, P5 ≈ C_t', () => {
-    expect(rows.find((r) => r.name === 'C13')!.length).toBe(11746);
+    // C13 has several lengths now: its straight bars are pieces (수정 2026-10-23); 11746 is the first 일자.
+    expect(rows.find((r) => r.name === 'C13')!.pieces!.some((p) => p.length === 11746)).toBe(true);
     expect(rows.find((r) => r.name === 'C14')!.length).toBe(3447.5);
     expect(rows.find((r) => r.name === 'C15')!.length).toBe(3852);
     expect(rows.find((r) => r.name === 'C16')!.length).toBe(4070);