diff --git a/README.md b/README.md
index 24c3328..621ab9c 100644
--- a/README.md
+++ b/README.md
@@ -73,7 +73,7 @@ Die App enthält jetzt einen MVP-Flow mit Bottom-Tabs:
 - Produktdetail: Ampelbewertung nach Allergien, Budget, Ernährung und Nachhaltigkeit
 - Alternativen: bessere Produktvorschläge aus dem lokalen Beispieldatensatz
 - Einkaufsliste: Produkte hinzufügen, abhaken, löschen und Gesamtsumme sehen
-- Profil: Präferenzen, Allergien, Budget, Bio-Vorliebe und Offline-Modus verwalten
+- Profil: Präferenzen, Allergien, Budget mit Zeitraum, Bio-Vorliebe und Offline-Modus verwalten
 
 Beispiel-Barcodes für Tests über Open Food Facts:
 
diff --git a/src/components/form/BudgetInput.js b/src/components/form/BudgetInput.js
index 379e062..be80bd6 100644
--- a/src/components/form/BudgetInput.js
+++ b/src/components/form/BudgetInput.js
@@ -1,8 +1,10 @@
-import { StyleSheet, Text, TextInput, View } from 'react-native';
+import { Pressable, StyleSheet, Text, TextInput, View } from 'react-native';
 
-import { colors } from '../../utils/constants';
+import { budgetPeriodLabels, colors } from '../../utils/constants';
 
-export default function BudgetInput({ value, currency, onChangeValue }) {
+const budgetPeriods = ['day', 'week', 'month', 'shoppingTrip'];
+
+export default function BudgetInput({ value, currency, period, onChangePeriod, onChangeValue }) {
   return (
     <View style={styles.wrap}>
       <Text style={styles.label}>Maximales Einkaufsbudget</Text>
@@ -15,6 +17,23 @@ export default function BudgetInput({ value, currency, onChangeValue }) {
           value={String(value ?? '')}
         />
       </View>
+      <View style={styles.periodGrid}>
+        {budgetPeriods.map((option) => {
+          const isActive = period === option;
+          return (
+            <Pressable
+              accessibilityRole="button"
+              key={option}
+              onPress={() => onChangePeriod(option)}
+              style={[styles.periodChip, isActive ? styles.activePeriodChip : null]}
+            >
+              <Text style={[styles.periodText, isActive ? styles.activePeriodText : null]}>
+                pro {budgetPeriodLabels[option]}
+              </Text>
+            </Pressable>
+          );
+        })}
+      </View>
     </View>
   );
 }
@@ -25,7 +44,7 @@ const styles = StyleSheet.create({
     borderColor: colors.border,
     borderRadius: 8,
     borderWidth: 1,
-    gap: 8,
+    gap: 10,
     padding: 14
   },
   label: {
@@ -52,5 +71,31 @@ const styles = StyleSheet.create({
     fontSize: 16,
     paddingHorizontal: 12,
     paddingVertical: 10
+  },
+  periodGrid: {
+    flexDirection: 'row',
+    flexWrap: 'wrap',
+    gap: 8
+  },
+  periodChip: {
+    alignItems: 'center',
+    borderColor: colors.border,
+    borderRadius: 8,
+    borderWidth: 1,
+    flexGrow: 1,
+    paddingHorizontal: 10,
+    paddingVertical: 9
+  },
+  activePeriodChip: {
+    backgroundColor: colors.primary,
+    borderColor: colors.primary
+  },
+  periodText: {
+    color: colors.text,
+    fontSize: 13,
+    fontWeight: '800'
+  },
+  activePeriodText: {
+    color: colors.surface
   }
 });
diff --git a/src/screens/ProductDetailScreen.js b/src/screens/ProductDetailScreen.js
index 7dff833..62bff3b 100644
--- a/src/screens/ProductDetailScreen.js
+++ b/src/screens/ProductDetailScreen.js
@@ -17,24 +17,24 @@ export default function ProductDetailScreen({ product, preferences, onBack, onAd
   const [savedMessage, setSavedMessage] = useState('');
   const [manualPrice, setManualPrice] = useState('');
   const [priceError, setPriceError] = useState('');
-  const rating = useMemo(() => calculateProductRating(product, preferences), [product, preferences]);
   const hasProductPrice = typeof product.price === 'number';
   const currency = product.currency || preferences.currency;
+  const parsedManualPrice = parseManualPrice(manualPrice);
+  const pricedProduct = useMemo(() => ({
+    ...product,
+    currency,
+    price: hasProductPrice ? product.price : parsedManualPrice
+  }), [currency, hasProductPrice, parsedManualPrice, product]);
+  const rating = useMemo(() => calculateProductRating(pricedProduct, preferences), [pricedProduct, preferences]);
 
   function addToList() {
-    const parsedManualPrice = parseManualPrice(manualPrice);
-
     if (!hasProductPrice && parsedManualPrice === undefined) {
       setSavedMessage('');
       setPriceError('Bitte gib einen Preis ein, bevor du das Produkt hinzufügst.');
       return;
     }
 
-    onAddToList({
-      ...product,
-      currency,
-      price: hasProductPrice ? product.price : parsedManualPrice
-    });
+    onAddToList(pricedProduct);
     setPriceError('');
     setSavedMessage('Produkt wurde zur Einkaufsliste hinzugefügt.');
   }
@@ -50,7 +50,7 @@ export default function ProductDetailScreen({ product, preferences, onBack, onAd
             <Text style={styles.brand}>{product.brand || 'Ohne Marke'}</Text>
             <Text style={styles.name}>{product.name}</Text>
             <Text style={styles.meta}>
-              {product.category || 'Produkt'} · {formatPrice(product.price, currency)}
+              {product.category || 'Produkt'} · {formatPrice(pricedProduct.price, currency)}
             </Text>
           </View>
           <ProductScoreBadge status={rating.overallStatus} score={rating.overallScore} />
diff --git a/src/screens/ProfileScreen.js b/src/screens/ProfileScreen.js
index 107fd7b..42bb8fa 100644
--- a/src/screens/ProfileScreen.js
+++ b/src/screens/ProfileScreen.js
@@ -68,7 +68,9 @@ export default function ProfileScreen({ preferences, onChangePreferences }) {
 
       <BudgetInput
         currency={preferences.currency}
+        onChangePeriod={(value) => updatePreference('budgetPeriod', value)}
         onChangeValue={(value) => updatePreference('maxBudgetPerShoppingTrip', value)}
+        period={preferences.budgetPeriod || 'week'}
         value={preferences.maxBudgetPerShoppingTrip}
       />
 
diff --git a/src/services/ratingService.js b/src/services/ratingService.js
index 118f27e..399b373 100644
--- a/src/services/ratingService.js
+++ b/src/services/ratingService.js
@@ -134,14 +134,26 @@ function rateBudget(product, preferences) {
   }
 
   const share = product.price / preferences.maxBudgetPerShoppingTrip;
+  const periodLabel = budgetPeriodLabel(preferences.budgetPeriod);
 
   if (share <= 0.08) {
-    return { status: 'good', message: 'Preis passt gut zu deinem Einkaufsbudget.' };
+    return { status: 'good', message: `Preis passt gut zu deinem Budget pro ${periodLabel}.` };
   }
 
   if (share <= 0.18) {
-    return { status: 'medium', message: 'Preis ist spürbar, aber noch im Rahmen.' };
+    return { status: 'medium', message: `Preis ist für dein Budget pro ${periodLabel} spürbar, aber noch im Rahmen.` };
   }
 
-  return { status: 'critical', message: 'Preis belastet dein Einkaufsbudget stark.' };
+  return { status: 'critical', message: `Preis belastet dein Budget pro ${periodLabel} stark.` };
+}
+
+function budgetPeriodLabel(period) {
+  const labels = {
+    day: 'Tag',
+    week: 'Woche',
+    month: 'Monat',
+    shoppingTrip: 'Einkauf'
+  };
+
+  return labels[period] || labels.week;
 }
diff --git a/src/utils/constants.js b/src/utils/constants.js
index 8795a3d..ecb4de3 100644
--- a/src/utils/constants.js
+++ b/src/utils/constants.js
@@ -17,6 +17,7 @@ export const defaultPreferences = {
   preferredDiet: 'lowSugar',
   preferBio: true,
   maxBudgetPerShoppingTrip: 45,
+  budgetPeriod: 'week',
   currency: 'CHF',
   offlineModeEnabled: false,
   sustainabilityPriority: 'medium',
@@ -30,3 +31,10 @@ export const dietLabels = {
   lowSugar: 'Wenig Zucker',
   highProtein: 'Proteinreich'
 };
+
+export const budgetPeriodLabels = {
+  day: 'Tag',
+  week: 'Woche',
+  month: 'Monat',
+  shoppingTrip: 'Einkauf'
+};