diff --git a/backend/hermes/app/schemas/repair_estimate.py b/backend/hermes/app/schemas/repair_estimate.py
index f2c6f44..3410a04 100644
--- a/backend/hermes/app/schemas/repair_estimate.py
+++ b/backend/hermes/app/schemas/repair_estimate.py
@@ -31,6 +31,13 @@ class RepairEstimateItemPayload(BaseModel):
             return None
         return normalize_text(value)
 
+    @field_validator("quantity", mode="before")
+    @classmethod
+    def normalize_quantity(cls, value: object) -> object:
+        if isinstance(value, str):
+            return value.strip().replace(",", ".")
+        return value
+
 
 class RepairEstimatePayload(BaseModel):
     title: str = Field(min_length=1, max_length=255)
@@ -53,6 +60,13 @@ class RepairEstimatePayload(BaseModel):
     def normalize_currency(cls, value: str) -> str:
         return value.upper() or "EUR"
 
+    @field_validator("tax_rate_percent", mode="before")
+    @classmethod
+    def normalize_tax_rate(cls, value: object) -> object:
+        if isinstance(value, str):
+            return value.strip().replace(",", ".")
+        return value
+
     @model_validator(mode="after")
     def validate_items(self):
         if not self.items:
diff --git a/frontend/athena/components/repairs/RepairEstimatesSection.tsx b/frontend/athena/components/repairs/RepairEstimatesSection.tsx
index 6e00342..b924bfa 100644
--- a/frontend/athena/components/repairs/RepairEstimatesSection.tsx
+++ b/frontend/athena/components/repairs/RepairEstimatesSection.tsx
@@ -19,7 +19,6 @@ import { Input } from "@/components/ui/input";
 import { api } from "@/lib/api";
 import type {
   RepairEstimate,
-  RepairEstimateItemPayload,
   RepairEstimateItemType,
   RepairEstimatePayload,
 } from "@/types/repair";
@@ -41,10 +40,40 @@ const statusLabels: Record<string, string> = {
   cancelled: "Storniert",
 };
 
+function humanizeValidationDetail(detail: unknown): string | null {
+  if (!Array.isArray(detail)) {
+    return null;
+  }
+
+  const messages = detail
+    .map((item) => {
+      if (typeof item !== "object" || item === null) {
+        return null;
+      }
+      const record = item as { loc?: unknown[]; msg?: unknown };
+      const field = Array.isArray(record.loc) ? record.loc.filter((part) => part !== "body").join(".") : "";
+      const message = typeof record.msg === "string" ? record.msg : "Ungültiger Wert";
+      return field ? `${field}: ${message}` : message;
+    })
+    .filter((message): message is string => Boolean(message));
+
+  return messages.length ? messages.join(" · ") : null;
+}
+
 function getErrorMessage(error: unknown) {
   if (typeof error === "object" && error !== null && "response" in error) {
-    const response = (error as { response?: { data?: { detail?: string; message?: string } } }).response;
-    return response?.data?.detail ?? response?.data?.message ?? "Aktion konnte nicht abgeschlossen werden";
+    const response = (error as { response?: { data?: { detail?: unknown; message?: unknown } } }).response;
+    const detailMessage = humanizeValidationDetail(response?.data?.detail);
+    if (detailMessage) {
+      return detailMessage;
+    }
+    if (typeof response?.data?.detail === "string") {
+      return response.data.detail;
+    }
+    if (typeof response?.data?.message === "string") {
+      return response.data.message;
+    }
+    return "Bitte prüfe die Eingaben. Mindestens eine gültige Position mit Titel, Menge und Preis ist erforderlich.";
   }
   return "Aktion konnte nicht abgeschlossen werden";
 }
@@ -58,18 +87,46 @@ function dateTime(value: string | null) {
   return new Intl.DateTimeFormat("de-DE", { dateStyle: "short", timeStyle: "short" }).format(new Date(value));
 }
 
-function emptyItem(): RepairEstimateItemPayload {
+type EstimateFormItem = {
+  item_type: RepairEstimateItemType;
+  title: string;
+  description: string | null;
+  quantity: string;
+  unit: string;
+  unit_price_euros: string;
+};
+
+type EstimateFormPayload = Omit<RepairEstimatePayload, "items"> & {
+  items: EstimateFormItem[];
+};
+
+function parseEuroToCents(value: string): number | null {
+  const normalized = value.trim().replace(/\s/g, "").replace(",", ".");
+  if (!normalized) {
+    return null;
+  }
+  if (!/^\d+(\.\d{1,2})?$/.test(normalized)) {
+    return null;
+  }
+  return Math.round(Number(normalized) * 100);
+}
+
+function centsToEuroInput(cents: number): string {
+  return (cents / 100).toFixed(2).replace(".", ",");
+}
+
+function emptyItem(): EstimateFormItem {
   return {
     item_type: "labor",
     title: "",
     description: "",
     quantity: "1.00",
     unit: "Std.",
-    unit_price_cents: 0,
+    unit_price_euros: "",
   };
 }
 
-function emptyPayload(): RepairEstimatePayload {
+function emptyPayload(): EstimateFormPayload {
   return {
     title: "Kostenvoranschlag",
     customer_message: "Bitte prüfen Sie den Kostenvoranschlag und geben Sie uns über den Statuslink Rückmeldung.",
@@ -106,7 +163,7 @@ export default function RepairEstimatesSection({
   const [error, setError] = useState("");
   const [dialogOpen, setDialogOpen] = useState(false);
   const [editing, setEditing] = useState<RepairEstimate | null>(null);
-  const [payload, setPayload] = useState<RepairEstimatePayload>(emptyPayload());
+  const [payload, setPayload] = useState<EstimateFormPayload>(emptyPayload());
   const [saving, setSaving] = useState(false);
   const [pendingId, setPendingId] = useState<number | null>(null);
   const [deleteTarget, setDeleteTarget] = useState<RepairEstimate | null>(null);
@@ -136,7 +193,8 @@ export default function RepairEstimatesSection({
 
   const clientSubtotal = useMemo(() => payload.items.reduce((sum, item) => {
     const quantity = Number(item.quantity.replace(",", ".")) || 0;
-    return sum + Math.round(quantity * item.unit_price_cents);
+    const unitPriceCents = parseEuroToCents(item.unit_price_euros) ?? 0;
+    return sum + Math.round(quantity * unitPriceCents);
   }, 0), [payload.items]);
   const clientTax = Math.round(clientSubtotal * (Number(payload.tax_rate_percent.replace(",", ".")) || 0) / 100);
 
@@ -161,13 +219,13 @@ export default function RepairEstimatesSection({
         description: item.description ?? "",
         quantity: String(item.quantity),
         unit: item.unit,
-        unit_price_cents: item.unit_price_cents,
+        unit_price_euros: centsToEuroInput(item.unit_price_cents),
       })),
     });
     setDialogOpen(true);
   }
 
-  function updateItem(index: number, update: Partial<RepairEstimateItemPayload>) {
+  function updateItem(index: number, update: Partial<EstimateFormItem>) {
     setPayload((current) => ({
       ...current,
       items: current.items.map((item, itemIndex) => itemIndex === index ? { ...item, ...update } : item),
@@ -177,14 +235,30 @@ export default function RepairEstimatesSection({
   async function saveEstimate() {
     setSaving(true);
     try {
+      const invalidPriceIndex = payload.items.findIndex((item) => parseEuroToCents(item.unit_price_euros) === null);
+      if (invalidPriceIndex >= 0) {
+        showToast({
+          type: "error",
+          title: "Preisangabe ungültig",
+          description: `Bitte gib den Einzelpreis in Position ${invalidPriceIndex + 1} als Eurobetrag ein, z. B. 100,00.`,
+        });
+        return;
+      }
+
       const normalizedPayload = {
-        ...payload,
-        internal_note: payload.internal_note || null,
+        title: payload.title.trim(),
+        customer_message: payload.customer_message.trim(),
+        internal_note: payload.internal_note?.trim() || null,
+        tax_rate_percent: payload.tax_rate_percent.replace(",", "."),
+        currency: payload.currency.trim().toUpperCase() || "EUR",
         valid_until: payload.valid_until || null,
         items: payload.items.map((item) => ({
-          ...item,
-          description: item.description || null,
+          item_type: item.item_type,
+          title: item.title.trim(),
+          description: item.description?.trim() || null,
           quantity: item.quantity.replace(",", "."),
+          unit: item.unit.trim() || "Stk.",
+          unit_price_cents: parseEuroToCents(item.unit_price_euros) ?? 0,
         })),
       };
       if (editing) {
@@ -346,7 +420,7 @@ export default function RepairEstimatesSection({
                     <Input placeholder="Titel" value={item.title} onChange={(event) => updateItem(index, { title: event.target.value })} />
                     <Input placeholder="Menge" value={item.quantity} onChange={(event) => updateItem(index, { quantity: event.target.value })} />
                     <Input placeholder="Einheit" value={item.unit} onChange={(event) => updateItem(index, { unit: event.target.value })} />
-                    <Input type="number" min={0} step={1} placeholder="Cent" value={item.unit_price_cents} onChange={(event) => updateItem(index, { unit_price_cents: Number(event.target.value) || 0 })} />
+                    <Input inputMode="decimal" placeholder="Einzelpreis €" value={item.unit_price_euros} onChange={(event) => updateItem(index, { unit_price_euros: event.target.value })} />
                     <Button type="button" variant="ghost" size="icon" disabled={payload.items.length === 1} onClick={() => setPayload((current) => ({ ...current, items: current.items.filter((_, itemIndex) => itemIndex !== index) }))} aria-label="Position entfernen"><Trash2 /></Button>
                   </div>
                   <Input className="mt-3" placeholder="Beschreibung optional" value={item.description ?? ""} onChange={(event) => updateItem(index, { description: event.target.value })} />