diff --git a/B07_DesignDetail/openwebcad/src/tools/scale-tool.test.ts b/B07_DesignDetail/openwebcad/src/tools/scale-tool.test.ts
new file mode 100644
index 000000000..ee52ef7ae
--- /dev/null
+++ b/B07_DesignDetail/openwebcad/src/tools/scale-tool.test.ts
@@ -0,0 +1,89 @@
+import { Point } from '@flatten-js/core';
+import { beforeEach, describe, expect, it } from 'vitest';
+import { createActor } from 'xstate';
+import { LineEntity } from '../entities/LineEntity.ts';
+import {
+	getEntities,
+	resetUndoBaseline,
+	setEntities,
+	setSelectedEntityIds,
+	undo,
+} from '../state.ts';
+import { ScaleState, scaleToolStateMachine } from './scale-tool.ts';
+import { ActorEvent } from './tool.types.ts';
+
+const ends = (index: number) => {
+	const line = getEntities()[index] as LineEntity;
+	const a = line.getStartPoint();
+	const b = line.getEndPoint();
+	return [a.x, a.y, b.x, b.y];
+};
+
+/** 기준점 (2,0) 클릭까지 — 선 A(0,0)-(10,0) 고름 · 선 B(0,5)-(4,5) 는 그대로 둘 것 */
+function startAtBasePoint() {
+	const a = new LineEntity('layer1', new Point(0, 0), new Point(10, 0));
+	const b = new LineEntity('layer1', new Point(0, 5), new Point(4, 5));
+	setEntities([a, b]);
+	resetUndoBaseline();
+	setSelectedEntityIds([a.id]);
+	const actor = createActor(scaleToolStateMachine).start();
+	expect(actor.getSnapshot().value).toBe(ScaleState.WAITING_FOR_BASE_VECTOR_START_POINT);
+	actor.send({
+		type: ActorEvent.MOUSE_CLICK,
+		worldMouseLocation: new Point(2, 0),
+		screenMouseLocation: new Point(0, 0),
+		holdingCtrl: false,
+		holdingShift: false,
+	});
+	expect(actor.getSnapshot().value).toBe(ScaleState.WAITING_FOR_BASE_VECTOR_END_POINT);
+	return { actor, a, b };
+}
+
+const typeNumber = (actor: ReturnType<typeof startAtBasePoint>['actor'], value: number) =>
+	actor.send({ type: ActorEvent.NUMBER_INPUT, value, worldMouseLocation: new Point(99, 99) });
+
+describe('축척 — 기준점 + 숫자 배율 (226-1)', () => {
+	beforeEach(() => setSelectedEntityIds([]));
+
+	it('배율 2 = 기준점 고정 두 배 · 다른 객체 · 순서 그대로', () => {
+		const { actor, a, b } = startAtBasePoint();
+		typeNumber(actor, 2);
+		// (0,0)→(-2,0) · (10,0)→(18,0) — 기준점 (2,0) 은 그대로
+		expect(ends(0)).toEqual([-2, 0, 18, 0]);
+		expect(getEntities()[0].id).toBe(a.id);
+		expect(getEntities()[1]).toBe(b);
+		expect(ends(1)).toEqual([0, 5, 4, 5]);
+		// 끝나면 선택 풀고 다음 고르기로
+		expect(actor.getSnapshot().value).toBe(ScaleState.WAITING_FOR_SELECTION);
+	});
+
+	it('배율 0.5 = 절반', () => {
+		const { actor } = startAtBasePoint();
+		typeNumber(actor, 0.5);
+		expect(ends(0)).toEqual([1, 0, 6, 0]);
+	});
+
+	it('되돌리기 한 번에 원래 자리', () => {
+		const { actor } = startAtBasePoint();
+		typeNumber(actor, 2);
+		undo();
+		expect(ends(0)).toEqual([0, 0, 10, 0]);
+		expect(getEntities()).toHaveLength(2);
+	});
+
+	it('Esc = 취소 — 객체 그대로', () => {
+		const { actor, a, b } = startAtBasePoint();
+		actor.send({ type: ActorEvent.ESC });
+		expect(getEntities()).toEqual([a, b]);
+		expect(ends(0)).toEqual([0, 0, 10, 0]);
+		typeNumber(actor, 2);
+		expect(ends(0)).toEqual([0, 0, 10, 0]);
+	});
+
+	it('배율 0 은 받지 않음', () => {
+		const { actor } = startAtBasePoint();
+		typeNumber(actor, 0);
+		expect(ends(0)).toEqual([0, 0, 10, 0]);
+		expect(actor.getSnapshot().value).toBe(ScaleState.WAITING_FOR_BASE_VECTOR_END_POINT);
+	});
+});
diff --git a/B07_DesignDetail/openwebcad/src/tools/scale-tool.ts b/B07_DesignDetail/openwebcad/src/tools/scale-tool.ts
index 660a885b2..c73e27c6e 100644
--- a/B07_DesignDetail/openwebcad/src/tools/scale-tool.ts
+++ b/B07_DesignDetail/openwebcad/src/tools/scale-tool.ts
@@ -2,15 +2,23 @@ import type { Point } from '@flatten-js/core';
 import {
 	addEntities,
 	deleteEntities,
+	getEntities,
 	getSelectedEntities,
 	getSelectedEntityIds,
 	setAngleGuideOriginPoint,
+	setEntities,
 	setGhostHelperEntities,
 	setSelectedEntityIds,
 	setShouldDrawHelpers,
 } from '../state';
 import { Tool } from '../tools';
-import type { DrawEvent, MouseClickEvent, StateEvent, ToolContext } from './tool.types';
+import type {
+	DrawEvent,
+	MouseClickEvent,
+	NumberInputEvent,
+	StateEvent,
+	ToolContext,
+} from './tool.types';
 import { assign, createMachine, sendTo } from 'xstate';
 import { selectToolStateMachine } from './select-tool';
 import type { Entity } from '../entities/Entity';
@@ -42,6 +50,7 @@ export enum ScaleAction {
 	COPY_SELECTION_BEFORE_SCALE = 'COPY_SELECTION_BEFORE_SCALE',
 	DRAW_TEMP_SCALE_ENTITIES = 'DRAW_TEMP_SCALE_ENTITIES',
 	SCALE_SELECTION = 'SCALE_SELECTION',
+	SCALE_SELECTION_BY_FACTOR = 'SCALE_SELECTION_BY_FACTOR',
 	DESELECT_ENTITIES = 'DESELECT_ENTITIES',
 	RESTORE_ORIGINAL_ENTITIES = 'RESTORE_ORIGINAL_ENTITIES',
 }
@@ -98,7 +107,7 @@ export const scaleToolStateMachine = createMachine(
 			[ScaleState.WAITING_FOR_SELECTION]: {
 				description: 'Select what you want to scale',
 				meta: {
-					instructions: 'Select what you want to scale, then ENTER',
+					instructions: '축척할 객체를 선택한 뒤 ENTER.',
 				},
 				invoke: {
 					id: 'selectToolInsideTheScaleTool',
@@ -142,7 +151,7 @@ export const scaleToolStateMachine = createMachine(
 			[ScaleState.WAITING_FOR_BASE_VECTOR_START_POINT]: {
 				description: 'Select the origin of the scale operation',
 				meta: {
-					instructions: 'Select the origin of the scale operation',
+					instructions: '기준점을 지정하십시오. (Esc 취소)',
 				},
 				always: {
 					actions: ScaleAction.ENABLE_HELPERS,
@@ -161,9 +170,17 @@ export const scaleToolStateMachine = createMachine(
 			[ScaleState.WAITING_FOR_BASE_VECTOR_END_POINT]: {
 				description: 'Select the end of the base scale line',
 				meta: {
-					instructions: 'Select the end of the base scale line',
+					instructions:
+						'배율을 입력하고 ENTER — 또는 끌어서 맞출 기준선 끝을 클릭하십시오. (Esc 취소)',
 				},
 				on: {
+					// 오토캐드 SCALE — 기준점 뒤 숫자 배율(2 = 두 배 · 0.5 = 절반)
+					NUMBER_INPUT: {
+						guard: ({ event }) =>
+							(event as NumberInputEvent).value > 0 && getSelectedEntityIds().length > 0,
+						actions: [ScaleAction.SCALE_SELECTION_BY_FACTOR, ScaleAction.DESELECT_ENTITIES],
+						target: ScaleState.INIT,
+					},
 					MOUSE_CLICK: {
 						actions: [
 							ScaleAction.RECORD_BASE_VECTOR_END_POINT,
@@ -180,7 +197,7 @@ export const scaleToolStateMachine = createMachine(
 			[ScaleState.WAITING_FOR_SCALE_VECTOR_END_POINT]: {
 				description: 'Select the end of the scale line',
 				meta: {
-					instructions: 'Select the end of the scale line',
+					instructions: '새 길이의 끝을 클릭하십시오. (Esc 취소)',
 				},
 				on: {
 					DRAW: {
@@ -235,7 +252,9 @@ export const scaleToolStateMachine = createMachine(
 				return {
 					...context,
 					// Make a copy of the selected entities before scaling them, so we can restore them when the user cancels the scale action
-					originalSelectedEntities: compact(selectedEntities.map((entity) => cloneKeepingLook(entity, true))),
+					originalSelectedEntities: compact(
+						selectedEntities.map((entity) => cloneKeepingLook(entity, true))
+					),
 				};
 			}),
 			[ScaleAction.DRAW_TEMP_SCALE_ENTITIES]: ({ context, event }) => {
@@ -282,6 +301,24 @@ export const scaleToolStateMachine = createMachine(
 				setGhostHelperEntities([]);
 				setSelectedEntityIds([]);
 			},
+			[ScaleAction.SCALE_SELECTION_BY_FACTOR]: ({ context, event }) => {
+				const origin = context.baseVectorStartPoint;
+				if (!origin) {
+					throw new Error('[SCALE] Calling scale by factor without a base point');
+				}
+				const factor = (event as NumberInputEvent).value;
+				const selectedIds = new Set(getSelectedEntityIds());
+				// 제자리 교체 — 복사본을 키워 같은 순서에 넣고 되돌리기 한 칸으로 남긴다
+				setEntities(
+					getEntities().map((entity) => {
+						if (!selectedIds.has(entity.id)) return entity;
+						const scaled = cloneKeepingLook(entity, true);
+						scaled.scale(origin, factor);
+						return scaled;
+					}),
+					true
+				);
+			},
 			[ScaleAction.DESELECT_ENTITIES]: assign(() => {
 				setGhostHelperEntities([]);
 				setSelectedEntityIds([]);