diff --git a/src/PowderCoating.Web/Controllers/JobsController.cs b/src/PowderCoating.Web/Controllers/JobsController.cs
index 3f20fc3..d1bcaf3 100644
--- a/src/PowderCoating.Web/Controllers/JobsController.cs
+++ b/src/PowderCoating.Web/Controllers/JobsController.cs
@@ -498,6 +498,13 @@ public class JobsController : Controller
                 .OrderByDescending(t => t.TransactionDate).ToList();
             ViewBag.MaterialsUsed = allJobTransactions;
 
+            // Inventory items for the manual log-material modal
+            var inventoryItemsForModal = (await _unitOfWork.InventoryItems.GetAllAsync())
+                .OrderBy(i => i.Name)
+                .Select(i => new { i.Id, i.Name, i.UnitOfMeasure, i.QuantityOnHand })
+                .ToList();
+            ViewBag.InventoryItemsForModal = System.Text.Json.JsonSerializer.Serialize(inventoryItemsForModal);
+
             // Pre-logged powder grouped by InventoryItemId (for Complete Job modal pre-fill)
             ViewBag.PreLoggedPowder = allJobTransactions
                 .GroupBy(t => t.InventoryItemId)
@@ -4080,9 +4087,87 @@ public class JobsController : Controller
 
         _logger.LogInformation("Recorded first job creation for company {CompanyId}", companyId);
     }
+
+    /// <summary>
+    /// Logs manual material usage from the job details page. Mirrors the QR scan LogUsage
+    /// flow in InventoryController but returns JSON so the modal can close and refresh inline.
+    /// Quantity is always the amount USED (caller converts from remaining if needed).
+    /// </summary>
+    [HttpPost]
+    [ValidateAntiForgeryToken]
+    public async Task<IActionResult> LogMaterial([FromBody] LogMaterialRequest req)
+    {
+        try
+        {
+            if (req.QuantityUsed <= 0)
+                return Json(new { success = false, message = "Quantity used must be greater than zero." });
+
+            var item = await _unitOfWork.InventoryItems.GetByIdAsync(req.InventoryItemId);
+            if (item == null) return Json(new { success = false, message = "Inventory item not found." });
+
+            var job = await _unitOfWork.Jobs.GetByIdAsync(req.JobId);
+            if (job == null) return Json(new { success = false, message = "Job not found." });
+
+            var txnType = req.TransactionType == "Waste"
+                ? InventoryTransactionType.Waste
+                : InventoryTransactionType.JobUsage;
+
+            item.QuantityOnHand -= req.QuantityUsed;
+            item.UpdatedAt = DateTime.UtcNow;
+            await _unitOfWork.InventoryItems.UpdateAsync(item);
+
+            var txn = new PowderCoating.Core.Entities.InventoryTransaction
+            {
+                InventoryItemId = item.Id,
+                TransactionType = txnType,
+                Quantity        = -req.QuantityUsed,
+                UnitCost        = item.UnitCost,
+                TotalCost       = req.QuantityUsed * item.UnitCost,
+                TransactionDate = DateTime.UtcNow,
+                BalanceAfter    = item.QuantityOnHand,
+                JobId           = req.JobId,
+                Reference       = $"Job {job.JobNumber}",
+                Notes           = req.Notes?.Trim(),
+                CompanyId       = item.CompanyId,
+                CreatedAt       = DateTime.UtcNow
+            };
+            await _unitOfWork.InventoryTransactions.AddAsync(txn);
+            await _unitOfWork.CompleteAsync();
+
+            // GL: DR COGS, CR Inventory Asset
+            if (item.CogsAccountId.HasValue && item.InventoryAccountId.HasValue)
+            {
+                var cost = req.QuantityUsed * (item.AverageCost > 0 ? item.AverageCost : item.UnitCost);
+                await _accountBalanceService.DebitAsync(item.CogsAccountId, cost);
+                await _accountBalanceService.CreditAsync(item.InventoryAccountId, cost);
+            }
+
+            return Json(new
+            {
+                success    = true,
+                message    = $"Logged {req.QuantityUsed:N2} {item.UnitOfMeasure} of {item.Name}.",
+                newBalance = item.QuantityOnHand,
+                unitOfMeasure = item.UnitOfMeasure,
+                itemName   = item.Name
+            });
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error logging material for job {JobId}", req.JobId);
+            return Json(new { success = false, message = "An error occurred. Please try again." });
+        }
+    }
 }
 
 public class DeleteTimeEntryRequest { public int Id { get; set; } }
+public class LogMaterialRequest
+{
+    public int     JobId           { get; set; }
+    public int     InventoryItemId { get; set; }
+    public decimal QuantityUsed    { get; set; }
+    public string  TransactionType { get; set; } = "JobUsage";
+    public string? Notes           { get; set; }
+}
 public class CreateReworkJobRequest { public int ReworkRecordId { get; set; } public string? Notes { get; set; } }
 
 public class UpdateWorkerAssignmentRequest
diff --git a/src/PowderCoating.Web/Views/Jobs/Details.cshtml b/src/PowderCoating.Web/Views/Jobs/Details.cshtml
index 9ddbb86..49b0b17 100644
--- a/src/PowderCoating.Web/Views/Jobs/Details.cshtml
+++ b/src/PowderCoating.Web/Views/Jobs/Details.cshtml
@@ -1016,9 +1016,12 @@
                                 <span class="badge bg-primary rounded-pill ms-1">@materialsUsed.Count</span>
                             }
                             <i class="bi bi-chevron-down collapse-chevron ms-1" style="transition:transform .2s;"></i>
-                            <span class="ms-auto">
-                                <a asp-controller="Inventory" asp-action="Scan" class="btn btn-sm btn-outline-primary" onclick="event.stopPropagation();">
-                                    <i class="bi bi-qr-code-scan me-1"></i>Log Material
+                            <span class="ms-auto d-flex gap-2">
+                                <button type="button" class="btn btn-sm btn-outline-primary" onclick="event.stopPropagation(); openLogMaterialModal();">
+                                    <i class="bi bi-plus-circle me-1"></i>Log Material
+                                </button>
+                                <a asp-controller="Inventory" asp-action="Scan" class="btn btn-sm btn-outline-secondary" onclick="event.stopPropagation();" title="Scan QR code">
+                                    <i class="bi bi-qr-code-scan"></i>
                                 </a>
                             </span>
                         </div>
@@ -1028,7 +1031,7 @@
                         {
                             <div class="card-body text-muted text-center py-3 small">
                                 <i class="bi bi-droplet me-1"></i>No materials have been logged for this job yet.
-                                Use the QR label on an inventory item to log usage.
+                                Click <strong>Log Material</strong> above or scan the QR label on an inventory item.
                             </div>
                         }
                         else
@@ -1089,6 +1092,65 @@
                     </div><!-- /collapseMaterials -->
                 </div>
 
+                <!-- Log Material Modal -->
+                <div class="modal fade" id="logMaterialModal" tabindex="-1" aria-labelledby="logMaterialModalLabel" aria-hidden="true">
+                    <div class="modal-dialog">
+                        <div class="modal-content">
+                            <div class="modal-header">
+                                <h5 class="modal-title" id="logMaterialModalLabel">
+                                    <i class="bi bi-droplet-half me-2 text-primary"></i>Log Material Usage
+                                </h5>
+                                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
+                            </div>
+                            <div class="modal-body">
+                                <div class="mb-3">
+                                    <label class="form-label fw-semibold">Inventory Item <span class="text-danger">*</span></label>
+                                    <select id="lmInventoryItem" class="form-select">
+                                        <option value="">-- Select item --</option>
+                                    </select>
+                                    <div id="lmItemBalance" class="form-text text-muted d-none"></div>
+                                </div>
+                                <div class="mb-3">
+                                    <label class="form-label fw-semibold">Entry Method</label>
+                                    <div class="d-flex gap-3">
+                                        <div class="form-check">
+                                            <input class="form-check-input" type="radio" name="lmEntryMethod" id="lmMethodUsed" value="used" checked onchange="lmUpdateQuantityLabel()">
+                                            <label class="form-check-label" for="lmMethodUsed">Amount Used</label>
+                                        </div>
+                                        <div class="form-check">
+                                            <input class="form-check-input" type="radio" name="lmEntryMethod" id="lmMethodRemaining" value="remaining" onchange="lmUpdateQuantityLabel()">
+                                            <label class="form-check-label" for="lmMethodRemaining">Amount Remaining</label>
+                                        </div>
+                                    </div>
+                                </div>
+                                <div class="mb-3">
+                                    <label id="lmQtyLabel" class="form-label fw-semibold">Quantity Used <span class="text-danger">*</span></label>
+                                    <input type="number" id="lmQuantity" class="form-control" min="0" step="0.01" placeholder="0.00">
+                                    <div id="lmComputedUsed" class="form-text text-muted d-none"></div>
+                                </div>
+                                <div class="mb-3">
+                                    <label class="form-label fw-semibold">Reason</label>
+                                    <select id="lmTransactionType" class="form-select">
+                                        <option value="JobUsage">Job Usage</option>
+                                        <option value="Waste">Waste / Spillage</option>
+                                    </select>
+                                </div>
+                                <div class="mb-3">
+                                    <label class="form-label fw-semibold">Notes</label>
+                                    <textarea id="lmNotes" class="form-control" rows="2" placeholder="Optional"></textarea>
+                                </div>
+                                <div id="lmAlert" class="alert alert-permanent d-none"></div>
+                            </div>
+                            <div class="modal-footer">
+                                <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Cancel</button>
+                                <button type="button" class="btn btn-primary" id="lmSaveBtn" onclick="lmSave()">
+                                    <i class="bi bi-check-circle me-1"></i>Log Usage
+                                </button>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+
                 <!-- Part Intake Modal -->
                 @{
                     var intakeExpectedCount = Model.Items?.Sum(i => (int)i.Quantity) ?? 0;
@@ -3082,6 +3144,18 @@
     }
 }
 
+<!-- Log Material Modal JS -->
+<script src="/js/log-material.js"></script>
+<script>
+(function () {
+    const inventoryItems = @Html.Raw(ViewBag.InventoryItemsForModal ?? "[]");
+    const jobId = @Model.Id;
+    const logUrl = '@Url.Action("LogMaterial", "Jobs")';
+    const token = document.querySelector('input[name="__RequestVerificationToken"]')?.value ?? '';
+    window.__logMaterial = { inventoryItems, jobId, logUrl, token };
+})();
+</script>
+
 <!-- Save as Template Modal -->
 <div class="modal fade" id="saveTemplateModal" tabindex="-1" aria-labelledby="saveTemplateModalLabel" aria-hidden="true">
     <div class="modal-dialog">
diff --git a/src/PowderCoating.Web/wwwroot/js/log-material.js b/src/PowderCoating.Web/wwwroot/js/log-material.js
new file mode 100644
index 0000000..6169cd4
--- /dev/null
+++ b/src/PowderCoating.Web/wwwroot/js/log-material.js
@@ -0,0 +1,150 @@
+/**
+ * Log Material Usage modal — job details page.
+ * Reads config from window.__logMaterial injected inline by the view.
+ */
+(function () {
+    let _items = [];
+    let _modal = null;
+
+    function init() {
+        const cfg = window.__logMaterial;
+        if (!cfg) return;
+
+        _items = cfg.inventoryItems || [];
+        _modal = new bootstrap.Modal(document.getElementById('logMaterialModal'));
+
+        const sel = document.getElementById('lmInventoryItem');
+        _items.forEach(function (item) {
+            const opt = document.createElement('option');
+            opt.value = item.id;
+            opt.textContent = item.name + (item.unitOfMeasure ? ' (' + item.unitOfMeasure + ')' : '');
+            opt.dataset.qty = item.quantityOnHand;
+            opt.dataset.uom = item.unitOfMeasure || '';
+            sel.appendChild(opt);
+        });
+
+        sel.addEventListener('change', lmOnItemChange);
+        document.getElementById('lmQuantity').addEventListener('input', lmOnQtyInput);
+    }
+
+    function lmOnItemChange() {
+        const sel = document.getElementById('lmInventoryItem');
+        const opt = sel.options[sel.selectedIndex];
+        const balDiv = document.getElementById('lmItemBalance');
+        if (sel.value && opt) {
+            const qty = parseFloat(opt.dataset.qty) || 0;
+            const uom = opt.dataset.uom;
+            balDiv.textContent = 'Current stock: ' + qty.toFixed(2) + (uom ? ' ' + uom : '');
+            balDiv.classList.remove('d-none');
+        } else {
+            balDiv.classList.add('d-none');
+        }
+        lmOnQtyInput();
+    }
+
+    function lmOnQtyInput() {
+        const method = document.querySelector('input[name="lmEntryMethod"]:checked')?.value;
+        if (method !== 'remaining') {
+            document.getElementById('lmComputedUsed').classList.add('d-none');
+            return;
+        }
+        const sel = document.getElementById('lmInventoryItem');
+        const opt = sel.options[sel.selectedIndex];
+        const remaining = parseFloat(document.getElementById('lmQuantity').value) || 0;
+        const onHand = parseFloat(opt?.dataset.qty) || 0;
+        const used = onHand - remaining;
+        const computedDiv = document.getElementById('lmComputedUsed');
+        if (sel.value) {
+            computedDiv.textContent = 'Usage = ' + onHand.toFixed(2) + ' − ' + remaining.toFixed(2) + ' = ' + used.toFixed(2) + ' ' + (opt?.dataset.uom || '');
+            computedDiv.classList.remove('d-none');
+        } else {
+            computedDiv.classList.add('d-none');
+        }
+    }
+
+    window.lmUpdateQuantityLabel = function () {
+        const method = document.querySelector('input[name="lmEntryMethod"]:checked')?.value;
+        document.getElementById('lmQtyLabel').innerHTML =
+            (method === 'remaining' ? 'Quantity Remaining' : 'Quantity Used') +
+            ' <span class="text-danger">*</span>';
+        lmOnQtyInput();
+    };
+
+    window.openLogMaterialModal = function () {
+        // Reset form
+        document.getElementById('lmInventoryItem').value = '';
+        document.getElementById('lmItemBalance').classList.add('d-none');
+        document.getElementById('lmQuantity').value = '';
+        document.getElementById('lmComputedUsed').classList.add('d-none');
+        document.getElementById('lmTransactionType').value = 'JobUsage';
+        document.getElementById('lmNotes').value = '';
+        document.getElementById('lmAlert').classList.add('d-none');
+        document.getElementById('lmSaveBtn').disabled = false;
+        document.getElementById('lmMethodUsed').checked = true;
+        window.lmUpdateQuantityLabel();
+        if (_modal) _modal.show();
+    };
+
+    window.lmSave = async function () {
+        const cfg = window.__logMaterial;
+        const itemId = parseInt(document.getElementById('lmInventoryItem').value) || 0;
+        const qtyInput = parseFloat(document.getElementById('lmQuantity').value) || 0;
+        const method = document.querySelector('input[name="lmEntryMethod"]:checked')?.value;
+        const alertEl = document.getElementById('lmAlert');
+
+        function showError(msg) {
+            alertEl.className = 'alert alert-danger alert-permanent';
+            alertEl.textContent = msg;
+            alertEl.classList.remove('d-none');
+        }
+
+        if (!itemId) { showError('Please select an inventory item.'); return; }
+        if (qtyInput <= 0) { showError('Please enter a quantity greater than zero.'); return; }
+
+        let quantityUsed = qtyInput;
+        if (method === 'remaining') {
+            const sel = document.getElementById('lmInventoryItem');
+            const onHand = parseFloat(sel.options[sel.selectedIndex]?.dataset.qty) || 0;
+            quantityUsed = onHand - qtyInput;
+            if (quantityUsed <= 0) {
+                showError('Remaining quantity cannot be equal to or greater than the current stock (' + onHand.toFixed(2) + ').');
+                return;
+            }
+        }
+
+        const btn = document.getElementById('lmSaveBtn');
+        btn.disabled = true;
+        alertEl.classList.add('d-none');
+
+        try {
+            const resp = await fetch(cfg.logUrl, {
+                method: 'POST',
+                headers: {
+                    'Content-Type': 'application/json',
+                    'RequestVerificationToken': cfg.token
+                },
+                body: JSON.stringify({
+                    jobId: cfg.jobId,
+                    inventoryItemId: itemId,
+                    quantityUsed: quantityUsed,
+                    transactionType: document.getElementById('lmTransactionType').value,
+                    notes: document.getElementById('lmNotes').value.trim() || null
+                })
+            });
+            const data = await resp.json();
+            if (data.success) {
+                if (_modal) _modal.hide();
+                // Reload page so the materials table refreshes
+                window.location.reload();
+            } else {
+                showError(data.message || 'An error occurred.');
+                btn.disabled = false;
+            }
+        } catch {
+            showError('Network error. Please try again.');
+            btn.disabled = false;
+        }
+    };
+
+    document.addEventListener('DOMContentLoaded', init);
+})();