diff --git a/app/timetracking/backend/router.py b/app/timetracking/backend/router.py
index 3297b54..2ce01b6 100644
--- a/app/timetracking/backend/router.py
+++ b/app/timetracking/backend/router.py
@@ -688,6 +688,67 @@ async def update_customer_hourly_rate(customer_id: int, hourly_rate: float, user
         raise HTTPException(status_code=500, detail=str(e))
 
 
+@router.post("/customers/bulk-update-rate", tags=["Customers"])
+async def bulk_update_customer_hourly_rates(
+    customer_ids: List[int],
+    hourly_rate: float,
+    user_id: Optional[int] = None
+):
+    """
+    Opdater timepris for flere kunder på én gang.
+    
+    Args:
+        customer_ids: Liste af kunde-ID'er
+        hourly_rate: Ny timepris i DKK (f.eks. 850.00)
+    
+    Returns:
+        Antal opdaterede kunder
+    """
+    try:
+        from decimal import Decimal
+        
+        # Validate inputs
+        if not customer_ids:
+            raise HTTPException(status_code=400, detail="No customers selected")
+        
+        if hourly_rate < 0:
+            raise HTTPException(status_code=400, detail="Hourly rate must be positive")
+        
+        rate_decimal = Decimal(str(hourly_rate))
+        
+        # Update all selected customers
+        execute_update(
+            "UPDATE tmodule_customers SET hourly_rate = %s, updated_at = CURRENT_TIMESTAMP WHERE id = ANY(%s)",
+            (rate_decimal, customer_ids)
+        )
+        
+        # Count affected rows
+        updated_count = len(customer_ids)
+        
+        # Audit log for each customer
+        for customer_id in customer_ids:
+            audit.log_event(
+                entity_type="customer",
+                entity_id=str(customer_id),
+                event_type="hourly_rate_updated",
+                details={"hourly_rate": float(hourly_rate), "bulk_update": True},
+                user_id=user_id
+            )
+        
+        logger.info(f"✅ Bulk updated hourly rate for {updated_count} customers to {hourly_rate} DKK")
+        
+        return {
+            "updated": updated_count,
+            "hourly_rate": float(hourly_rate)
+        }
+        
+    except HTTPException:
+        raise
+    except Exception as e:
+        logger.error(f"❌ Error in bulk hourly rate update: {e}")
+        raise HTTPException(status_code=500, detail=str(e))
+
+
 @router.patch("/customers/{customer_id}/time-card", tags=["Customers"])
 async def toggle_customer_time_card(customer_id: int, enabled: bool, user_id: Optional[int] = None):
     """
diff --git a/app/timetracking/frontend/customers.html b/app/timetracking/frontend/customers.html
index 2c99727..a7a42e6 100644
--- a/app/timetracking/frontend/customers.html
+++ b/app/timetracking/frontend/customers.html
@@ -90,16 +90,21 @@
 
         <!-- Filters -->
         <div class="row mb-3">
-            <div class="col-md-6">
+            <div class="col-md-4">
                 <input type="text" class="form-control" id="search-input" placeholder="🔍 Søg kunde..." onkeyup="filterTable()">
             </div>
-            <div class="col-md-6">
+            <div class="col-md-4">
                 <select class="form-select" id="filter-select" onchange="filterTable()">
                     <option value="all">Alle kunder</option>
                     <option value="custom">Kun custom priser</option>
                     <option value="standard">Kun standard priser</option>
                 </select>
             </div>
+            <div class="col-md-4">
+                <button class="btn btn-primary w-100" id="bulk-price-btn" onclick="openBulkPriceModal()" disabled>
+                    <i class="bi bi-tag"></i> Opdater pris (<span id="selected-count">0</span> valgt)
+                </button>
+            </div>
         </div>
 
         <!-- Customers Table -->
@@ -109,6 +114,9 @@
                     <table class="table table-hover" id="customers-table">
                         <thead>
                             <tr>
+                                <th style="width: 40px;">
+                                    <input type="checkbox" class="form-check-input" id="select-all" onchange="toggleSelectAll()">
+                                </th>
                                 <th>Kunde</th>
                                 <th>vTiger ID</th>
                                 <th class="text-end">Timepris (DKK)</th>
@@ -224,9 +232,45 @@
         </div>
     </div>
 
+    <!-- Bulk Price Update Modal -->
+    <div class="modal fade" id="bulkPriceModal" tabindex="-1">
+        <div class="modal-dialog">
+            <div class="modal-content">
+                <div class="modal-header">
+                    <h5 class="modal-title">
+                        <i class="bi bi-tag"></i> Opdater timepris for flere kunder
+                    </h5>
+                    <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
+                </div>
+                <div class="modal-body">
+                    <div class="alert alert-info">
+                        <i class="bi bi-info-circle"></i> Du har valgt <strong><span id="bulk-customer-count">0</span> kunder</strong>
+                    </div>
+                    <div class="mb-3">
+                        <label for="bulk-price-input" class="form-label">Ny timepris (DKK)</label>
+                        <input type="number" class="form-control" id="bulk-price-input" 
+                               min="0" step="50" placeholder="f.eks. 1200">
+                        <div class="form-text">Indtast ny timepris for alle valgte kunder</div>
+                    </div>
+                    <div id="bulk-selected-customers" class="mt-3">
+                        <strong>Valgte kunder:</strong>
+                        <ul id="bulk-customer-list" class="mt-2" style="max-height: 200px; overflow-y: auto;"></ul>
+                    </div>
+                </div>
+                <div class="modal-footer">
+                    <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Annuller</button>
+                    <button type="button" class="btn btn-primary" onclick="updateBulkPrices()">
+                        <i class="bi bi-check-circle"></i> Opdater priser
+                    </button>
+                </div>
+            </div>
+        </div>
+    </div>
+
     <script>
         let allCustomers = [];
         let defaultRate = 850.00; // Fallback værdi
+        let selectedCustomers = new Set(); // Track selected customer IDs
 
         // Load customers on page load
         document.addEventListener('DOMContentLoaded', () => {
@@ -273,7 +317,7 @@
             const tbody = document.getElementById('customers-tbody');
             
             if (customers.length === 0) {
-                tbody.innerHTML = '<tr><td colspan="5" class="text-center py-4">Ingen kunder fundet</td></tr>';
+                tbody.innerHTML = '<tr><td colspan="6" class="text-center py-4">Ingen kunder fundet</td></tr>';
                 return;
             }
 
@@ -283,9 +327,17 @@
                 const statusBadge = isCustom 
                     ? '<span class="badge bg-primary">Custom</span>'
                     : '<span class="badge bg-secondary">Standard</span>';
+                const isChecked = selectedCustomers.has(customer.id) ? 'checked' : '';
                 
                 return `
                     <tr class="editable-row" id="row-${customer.id}">
+                        <td>
+                            <input type="checkbox" class="form-check-input customer-checkbox" 
+                                   data-customer-id="${customer.id}" 
+                                   data-customer-name="${customer.name.replace(/'/g, "\\'")}"
+                                   onchange="toggleCustomerSelection(${customer.id})" 
+                                   ${isChecked}>
+                        </td>
                         <td style="cursor: pointer;" onclick="viewTimeEntries(${customer.id}, '${customer.name.replace(/'/g, "\\'")}')">
                             <strong>${customer.name}</strong>
                             ${customer.uses_time_card ? '<span class="badge bg-warning text-dark ms-2">Klippekort</span>' : ''}
@@ -802,6 +854,114 @@
                 showToast(`Fejl ved oprettelse af ordre: ${error.message}`, 'danger');
             }
         });
+
+        // Bulk selection functions
+        function toggleCustomerSelection(customerId) {
+            if (selectedCustomers.has(customerId)) {
+                selectedCustomers.delete(customerId);
+            } else {
+                selectedCustomers.add(customerId);
+            }
+            updateBulkUI();
+        }
+
+        function toggleSelectAll() {
+            const selectAllCheckbox = document.getElementById('select-all');
+            const checkboxes = document.querySelectorAll('.customer-checkbox');
+            
+            if (selectAllCheckbox.checked) {
+                checkboxes.forEach(cb => {
+                    selectedCustomers.add(parseInt(cb.dataset.customerId));
+                    cb.checked = true;
+                });
+            } else {
+                selectedCustomers.clear();
+                checkboxes.forEach(cb => cb.checked = false);
+            }
+            updateBulkUI();
+        }
+
+        function updateBulkUI() {
+            const count = selectedCustomers.size;
+            document.getElementById('selected-count').textContent = count;
+            document.getElementById('bulk-price-btn').disabled = count === 0;
+            
+            // Update select-all checkbox state
+            const totalVisible = document.querySelectorAll('.customer-checkbox').length;
+            const selectAllCheckbox = document.getElementById('select-all');
+            if (selectAllCheckbox) {
+                selectAllCheckbox.checked = count > 0 && count === totalVisible;
+                selectAllCheckbox.indeterminate = count > 0 && count < totalVisible;
+            }
+        }
+
+        function openBulkPriceModal() {
+            if (selectedCustomers.size === 0) return;
+            
+            // Update customer count
+            document.getElementById('bulk-customer-count').textContent = selectedCustomers.size;
+            
+            // Build list of selected customers
+            const customerList = document.getElementById('bulk-customer-list');
+            const selectedCustomerData = allCustomers.filter(c => selectedCustomers.has(c.id));
+            
+            customerList.innerHTML = selectedCustomerData.map(customer => 
+                `<li>${customer.name} (nuværende: ${(customer.hourly_rate || defaultRate).toFixed(2)} DKK)</li>`
+            ).join('');
+            
+            // Clear previous input
+            document.getElementById('bulk-price-input').value = '';
+            
+            // Show modal
+            const modal = new bootstrap.Modal(document.getElementById('bulkPriceModal'));
+            modal.show();
+        }
+
+        async function updateBulkPrices() {
+            const newPrice = parseFloat(document.getElementById('bulk-price-input').value);
+            
+            if (!newPrice || newPrice < 0) {
+                showToast('Indtast venligst en gyldig pris', 'warning');
+                return;
+            }
+            
+            const customerIds = Array.from(selectedCustomers);
+            
+            try {
+                const response = await fetch('/api/v1/timetracking/customers/bulk-update-rate', {
+                    method: 'POST',
+                    headers: {'Content-Type': 'application/json'},
+                    body: JSON.stringify({
+                        customer_ids: customerIds,
+                        hourly_rate: newPrice
+                    })
+                });
+                
+                if (!response.ok) {
+                    const errorData = await response.json();
+                    throw new Error(errorData.detail || 'Fejl ved opdatering');
+                }
+                
+                const result = await response.json();
+                
+                // Close modal
+                const modal = bootstrap.Modal.getInstance(document.getElementById('bulkPriceModal'));
+                modal.hide();
+                
+                // Clear selection
+                selectedCustomers.clear();
+                document.getElementById('select-all').checked = false;
+                
+                // Reload data
+                await loadCustomers();
+                
+                showToast(`✅ Opdateret pris for ${result.updated} kunder`, 'success');
+                
+            } catch (error) {
+                console.error('Error updating bulk prices:', error);
+                showToast(`Fejl ved opdatering: ${error.message}`, 'danger');
+            }
+        }
     </script>
 </div>
 {% endblock %}
diff --git a/test_bulk_customer_update.py b/test_bulk_customer_update.py
new file mode 100644
index 0000000..0feae88
--- /dev/null
+++ b/test_bulk_customer_update.py
@@ -0,0 +1,25 @@
+"""
+Quick test of bulk customer hourly rate update endpoint
+"""
+import json
+
+# Test payload structure
+test_payload = {
+    "customer_ids": [1, 2, 3],
+    "hourly_rate": 1200.00
+}
+
+print("Test payload for POST /api/v1/timetracking/customers/bulk-update-rate:")
+print(json.dumps(test_payload, indent=2))
+
+print("\nExpected response:")
+expected_response = {
+    "updated": 3,
+    "hourly_rate": 1200.00
+}
+print(json.dumps(expected_response, indent=2))
+
+print("\nEndpoint ready for testing!")
+print("curl -X POST http://172.16.31.183:8000/api/v1/timetracking/customers/bulk-update-rate \\")
+print('  -H "Content-Type: application/json" \\')
+print(f'  -d \'{json.dumps(test_payload)}\'')