diff --git a/src/client/components/CollectionView.tsx b/src/client/components/CollectionView.tsx
index b337d23..f3f4d51 100644
--- a/src/client/components/CollectionView.tsx
+++ b/src/client/components/CollectionView.tsx
@@ -224,6 +224,7 @@ export function CollectionView() {
 								name={item.name}
 								weightGrams={item.weightGrams}
 								priceCents={item.priceCents}
+								quantity={item.quantity}
 								categoryName={item.categoryName}
 								categoryIcon={item.categoryIcon}
 								imageFilename={item.imageFilename}
@@ -257,6 +258,7 @@ export function CollectionView() {
 											name={item.name}
 											weightGrams={item.weightGrams}
 											priceCents={item.priceCents}
+											quantity={item.quantity}
 											categoryName={categoryName}
 											categoryIcon={categoryIcon}
 											imageFilename={item.imageFilename}
diff --git a/src/client/components/ItemCard.tsx b/src/client/components/ItemCard.tsx
index 03f4b49..e6383ee 100644
--- a/src/client/components/ItemCard.tsx
+++ b/src/client/components/ItemCard.tsx
@@ -8,6 +8,7 @@ interface ItemCardProps {
 	name: string;
 	weightGrams: number | null;
 	priceCents: number | null;
+	quantity?: number;
 	categoryName: string;
 	categoryIcon: string;
 	imageFilename: string | null;
@@ -22,6 +23,7 @@ export function ItemCard({
 	name,
 	weightGrams,
 	priceCents,
+	quantity,
 	categoryName,
 	categoryIcon,
 	imageFilename,
@@ -122,9 +124,16 @@ export function ItemCard({
 				)}
 			</div>
 			<div className="p-4">
-				<h3 className="text-sm font-semibold text-gray-900 mb-2 truncate">
-					{name}
-				</h3>
+				<div className="flex items-center gap-1.5 mb-2">
+					<h3 className="text-sm font-semibold text-gray-900 truncate min-w-0">
+						{name}
+					</h3>
+					{quantity != null && quantity > 1 && (
+						<span className="shrink-0 inline-flex items-center px-1.5 py-0.5 rounded-full text-xs font-medium bg-gray-100 text-gray-600">
+							&times;{quantity}
+						</span>
+					)}
+				</div>
 				<div className="flex flex-wrap gap-1.5">
 					{weightGrams != null && (
 						<span className="inline-flex items-center px-2 py-0.5 rounded-full text-xs font-medium bg-blue-50 text-blue-400">
diff --git a/src/client/components/ItemForm.tsx b/src/client/components/ItemForm.tsx
index fbb2ec2..dc2d127 100644
--- a/src/client/components/ItemForm.tsx
+++ b/src/client/components/ItemForm.tsx
@@ -13,6 +13,7 @@ interface FormData {
 	name: string;
 	weightGrams: string;
 	priceDollars: string;
+	quantity: number;
 	categoryId: number;
 	notes: string;
 	productUrl: string;
@@ -23,6 +24,7 @@ const INITIAL_FORM: FormData = {
 	name: "",
 	weightGrams: "",
 	priceDollars: "",
+	quantity: 1,
 	categoryId: 1,
 	notes: "",
 	productUrl: "",
@@ -49,6 +51,7 @@ export function ItemForm({ mode, itemId }: ItemFormProps) {
 					weightGrams: item.weightGrams != null ? String(item.weightGrams) : "",
 					priceDollars:
 						item.priceCents != null ? (item.priceCents / 100).toFixed(2) : "",
+					quantity: item.quantity ?? 1,
 					categoryId: item.categoryId,
 					notes: item.notes ?? "",
 					productUrl: item.productUrl ?? "",
@@ -98,6 +101,7 @@ export function ItemForm({ mode, itemId }: ItemFormProps) {
 			priceCents: form.priceDollars
 				? Math.round(Number(form.priceDollars) * 100)
 				: undefined,
+			quantity: form.quantity,
 			categoryId: form.categoryId,
 			notes: form.notes.trim() || undefined,
 			productUrl: form.productUrl.trim() || undefined,
@@ -202,6 +206,30 @@ export function ItemForm({ mode, itemId }: ItemFormProps) {
 				)}
 			</div>
 
+			{/* Quantity */}
+			<div>
+				<label
+					htmlFor="item-quantity"
+					className="block text-sm font-medium text-gray-700 mb-1"
+				>
+					Quantity
+				</label>
+				<input
+					id="item-quantity"
+					type="number"
+					min="1"
+					step="1"
+					value={form.quantity}
+					onChange={(e) =>
+						setForm((f) => ({
+							...f,
+							quantity: Math.max(1, Number(e.target.value) || 1),
+						}))
+					}
+					className="w-full px-3 py-2 border border-gray-200 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-gray-400 focus:border-transparent"
+				/>
+			</div>
+
 			{/* Category */}
 			<div>
 				<label className="block text-sm font-medium text-gray-700 mb-1">
diff --git a/src/client/components/WeightSummaryCard.tsx b/src/client/components/WeightSummaryCard.tsx
index e4b035f..ed4fa73 100644
--- a/src/client/components/WeightSummaryCard.tsx
+++ b/src/client/components/WeightSummaryCard.tsx
@@ -55,9 +55,15 @@ function buildCategoryChartData(items: SetupItemWithCategory[]): ChartDatum[] {
 	const groups = new Map<string, number>();
 	for (const item of items) {
 		const current = groups.get(item.categoryName) ?? 0;
-		groups.set(item.categoryName, current + (item.weightGrams ?? 0));
+		groups.set(
+			item.categoryName,
+			current + (item.weightGrams ?? 0) * (item.quantity ?? 1),
+		);
 	}
-	const total = items.reduce((sum, i) => sum + (i.weightGrams ?? 0), 0);
+	const total = items.reduce(
+		(sum, i) => sum + (i.weightGrams ?? 0) * (i.quantity ?? 1),
+		0,
+	);
 	return Array.from(groups.entries())
 		.filter(([, weight]) => weight > 0)
 		.map(([name, weight]) => ({
@@ -76,7 +82,8 @@ function buildClassificationChartData(
 		consumable: 0,
 	};
 	for (const item of items) {
-		groups[item.classification] += item.weightGrams ?? 0;
+		groups[item.classification] +=
+			(item.weightGrams ?? 0) * (item.quantity ?? 1);
 	}
 	const total = Object.values(groups).reduce((a, b) => a + b, 0);
 	return Object.entries(groups)
@@ -148,17 +155,23 @@ export function WeightSummaryCard({ items }: WeightSummaryCardProps) {
 
 	const baseWeight = items.reduce(
 		(sum, i) =>
-			i.classification === "base" ? sum + (i.weightGrams ?? 0) : sum,
+			i.classification === "base"
+				? sum + (i.weightGrams ?? 0) * (i.quantity ?? 1)
+				: sum,
 		0,
 	);
 	const wornWeight = items.reduce(
 		(sum, i) =>
-			i.classification === "worn" ? sum + (i.weightGrams ?? 0) : sum,
+			i.classification === "worn"
+				? sum + (i.weightGrams ?? 0) * (i.quantity ?? 1)
+				: sum,
 		0,
 	);
 	const consumableWeight = items.reduce(
 		(sum, i) =>
-			i.classification === "consumable" ? sum + (i.weightGrams ?? 0) : sum,
+			i.classification === "consumable"
+				? sum + (i.weightGrams ?? 0) * (i.quantity ?? 1)
+				: sum,
 		0,
 	);
 	const totalWeight = baseWeight + wornWeight + consumableWeight;
diff --git a/src/client/hooks/useItems.ts b/src/client/hooks/useItems.ts
index cd665cf..4b4735e 100644
--- a/src/client/hooks/useItems.ts
+++ b/src/client/hooks/useItems.ts
@@ -7,6 +7,7 @@ interface ItemWithCategory {
 	name: string;
 	weightGrams: number | null;
 	priceCents: number | null;
+	quantity: number;
 	categoryId: number;
 	notes: string | null;
 	productUrl: string | null;
diff --git a/src/client/hooks/useSetups.ts b/src/client/hooks/useSetups.ts
index 70eb776..4149bc4 100644
--- a/src/client/hooks/useSetups.ts
+++ b/src/client/hooks/useSetups.ts
@@ -16,6 +16,7 @@ interface SetupItemWithCategory {
 	name: string;
 	weightGrams: number | null;
 	priceCents: number | null;
+	quantity: number;
 	categoryId: number;
 	notes: string | null;
 	productUrl: string | null;
diff --git a/src/client/routes/setups/$setupId.tsx b/src/client/routes/setups/$setupId.tsx
index a985c90..70f3f23 100644
--- a/src/client/routes/setups/$setupId.tsx
+++ b/src/client/routes/setups/$setupId.tsx
@@ -53,13 +53,13 @@ function SetupDetailPage() {
 		);
 	}
 
-	// Compute totals from items
+	// Compute totals from items (multiply by quantity)
 	const totalWeight = setup.items.reduce(
-		(sum, item) => sum + (item.weightGrams ?? 0),
+		(sum, item) => sum + (item.weightGrams ?? 0) * (item.quantity ?? 1),
 		0,
 	);
 	const totalCost = setup.items.reduce(
-		(sum, item) => sum + (item.priceCents ?? 0),
+		(sum, item) => sum + (item.priceCents ?? 0) * (item.quantity ?? 1),
 		0,
 	);
 	const itemCount = setup.items.length;
@@ -207,11 +207,13 @@ function SetupDetailPage() {
 							{ items: categoryItems, categoryName, categoryIcon },
 						]) => {
 							const catWeight = categoryItems.reduce(
-								(sum, item) => sum + (item.weightGrams ?? 0),
+								(sum, item) =>
+									sum + (item.weightGrams ?? 0) * (item.quantity ?? 1),
 								0,
 							);
 							const catCost = categoryItems.reduce(
-								(sum, item) => sum + (item.priceCents ?? 0),
+								(sum, item) =>
+									sum + (item.priceCents ?? 0) * (item.quantity ?? 1),
 								0,
 							);
 							return (
@@ -232,6 +234,7 @@ function SetupDetailPage() {
 												name={item.name}
 												weightGrams={item.weightGrams}
 												priceCents={item.priceCents}
+												quantity={item.quantity}
 												categoryName={categoryName}
 												categoryIcon={categoryIcon}
 												imageFilename={item.imageFilename}
diff --git a/src/server/services/setup.service.ts b/src/server/services/setup.service.ts
index a3f2004..1128ab7 100644
--- a/src/server/services/setup.service.ts
+++ b/src/server/services/setup.service.ts
@@ -21,12 +21,12 @@ export function getAllSetups(db: Db = prodDb) {
         WHERE setup_items.setup_id = setups.id
       ), 0)`.as("item_count"),
 			totalWeight: sql<number>`COALESCE((
-        SELECT SUM(items.weight_grams) FROM setup_items
+        SELECT SUM(items.weight_grams * items.quantity) FROM setup_items
         JOIN items ON items.id = setup_items.item_id
         WHERE setup_items.setup_id = setups.id
       ), 0)`.as("total_weight"),
 			totalCost: sql<number>`COALESCE((
-        SELECT SUM(items.price_cents) FROM setup_items
+        SELECT SUM(items.price_cents * items.quantity) FROM setup_items
         JOIN items ON items.id = setup_items.item_id
         WHERE setup_items.setup_id = setups.id
       ), 0)`.as("total_cost"),
@@ -45,6 +45,7 @@ export function getSetupWithItems(db: Db = prodDb, setupId: number) {
 			name: items.name,
 			weightGrams: items.weightGrams,
 			priceCents: items.priceCents,
+			quantity: items.quantity,
 			categoryId: items.categoryId,
 			notes: items.notes,
 			productUrl: items.productUrl,
diff --git a/src/server/services/thread.service.ts b/src/server/services/thread.service.ts
index a43d04a..3b68b07 100644
--- a/src/server/services/thread.service.ts
+++ b/src/server/services/thread.service.ts
@@ -299,6 +299,7 @@ export function resolveThread(
 				productUrl: candidate.productUrl,
 				imageFilename: candidate.imageFilename,
 				imageSourceUrl: candidate.imageSourceUrl,
+				quantity: 1,
 			})
 			.returning()
 			.get();
diff --git a/src/server/services/totals.service.ts b/src/server/services/totals.service.ts
index c226b0b..53678e7 100644
--- a/src/server/services/totals.service.ts
+++ b/src/server/services/totals.service.ts
@@ -10,8 +10,8 @@ export function getCategoryTotals(db: Db = prodDb) {
 			categoryId: items.categoryId,
 			categoryName: categories.name,
 			categoryIcon: categories.icon,
-			totalWeight: sql<number>`COALESCE(SUM(${items.weightGrams}), 0)`,
-			totalCost: sql<number>`COALESCE(SUM(${items.priceCents}), 0)`,
+			totalWeight: sql<number>`COALESCE(SUM(${items.weightGrams} * ${items.quantity}), 0)`,
+			totalCost: sql<number>`COALESCE(SUM(${items.priceCents} * ${items.quantity}), 0)`,
 			itemCount: sql<number>`COUNT(*)`,
 		})
 		.from(items)
@@ -23,8 +23,8 @@ export function getCategoryTotals(db: Db = prodDb) {
 export function getGlobalTotals(db: Db = prodDb) {
 	return db
 		.select({
-			totalWeight: sql<number>`COALESCE(SUM(${items.weightGrams}), 0)`,
-			totalCost: sql<number>`COALESCE(SUM(${items.priceCents}), 0)`,
+			totalWeight: sql<number>`COALESCE(SUM(${items.weightGrams} * ${items.quantity}), 0)`,
+			totalCost: sql<number>`COALESCE(SUM(${items.priceCents} * ${items.quantity}), 0)`,
 			itemCount: sql<number>`COUNT(*)`,
 		})
 		.from(items)