diff --git a/viewer/widgets/JFJochViewerROIList.cpp b/viewer/widgets/JFJochViewerROIList.cpp
index efaa8b13..8edbb706 100644
--- a/viewer/widgets/JFJochViewerROIList.cpp
+++ b/viewer/widgets/JFJochViewerROIList.cpp
@@ -4,9 +4,13 @@
 #include "JFJochViewerROIList.h"
 
 #include <set>
+#include <cmath>
+
+#include "../../common/JFJochMath.h"
 
 #include <QVBoxLayout>
 #include <QHBoxLayout>
+#include <QGridLayout>
 #include <QPushButton>
 #include <QInputDialog>
 
@@ -32,16 +36,93 @@ JFJochViewerROIList::JFJochViewerROIList(QWidget *parent) : QWidget(parent) {
     connect(ren, &QPushButton::clicked, this, &JFJochViewerROIList::OnRename);
     connect(del, &QPushButton::clicked, this, &JFJochViewerROIList::OnDelete);
 
+    auto *grid = new QGridLayout();
+    for (int i = 0; i < 4; i++) {
+        flabel_[i] = new QLabel("", this);
+        fedit_[i] = new QLineEdit(this);
+        grid->addWidget(flabel_[i], i, 0);
+        grid->addWidget(fedit_[i], i, 1);
+        connect(fedit_[i], &QLineEdit::editingFinished, this, &JFJochViewerROIList::ApplyEditor);
+    }
+    layout->addLayout(grid);
+
     result_ = new JFJochViewerROIResult(this);
     layout->addWidget(result_);
 }
 
+void JFJochViewerROIList::UpdateEditor() {
+    const std::string sel = SelectedName().toStdString();
+    auto set = [&](int i, const QString &label, double val, bool integer) {
+        flabel_[i]->setText(label);
+        flabel_[i]->setVisible(!label.isEmpty());
+        fedit_[i]->setVisible(!label.isEmpty());
+        if (!label.isEmpty())
+            fedit_[i]->setText(integer ? QString::number(std::lround(val)) : QString::number(val, 'g', 6));
+    };
+    for (int i = 0; i < 4; i++)
+        set(i, "", 0, false);
+
+    for (const auto &b : rois_.boxes)
+        if (b.GetName() == sel) {
+            set(0, "Min X", b.GetXMin(), true);  set(1, "Max X", b.GetXMax(), true);
+            set(2, "Min Y", b.GetYMin(), true);  set(3, "Max Y", b.GetYMax(), true);
+            return;
+        }
+    for (const auto &c : rois_.circles)
+        if (c.GetName() == sel) {
+            set(0, "Center X", c.GetX(), false); set(1, "Center Y", c.GetY(), false);
+            set(2, "Radius", c.GetRadius_pxl(), false); set(3, "", 0, false);
+            return;
+        }
+    for (const auto &a : rois_.azimuthal)
+        if (a.GetName() == sel) {
+            set(0, "Q min [1/A]", a.GetQMin_recipA(), false); set(1, "Q max [1/A]", a.GetQMax_recipA(), false);
+            set(2, "phi min [deg]", a.GetPhiMin_deg(), false); set(3, "phi max [deg]", a.GetPhiMax_deg(), false);
+            return;
+        }
+}
+
+void JFJochViewerROIList::ApplyEditor() {
+    if (rebuilding_)
+        return;
+    const std::string sel = SelectedName().toStdString();
+    bool changed = false;
+
+    for (auto &b : rois_.boxes)
+        if (b.GetName() == sel) {
+            b = ROIBox(sel, fedit_[0]->text().toLongLong(), fedit_[1]->text().toLongLong(),
+                            fedit_[2]->text().toLongLong(), fedit_[3]->text().toLongLong());
+            changed = true; break;
+        }
+    for (auto &c : rois_.circles)
+        if (c.GetName() == sel) {
+            c = ROICircle(sel, fedit_[0]->text().toDouble(), fedit_[1]->text().toDouble(),
+                               std::max(0.1, fedit_[2]->text().toDouble()));
+            changed = true; break;
+        }
+    for (auto &a : rois_.azimuthal)
+        if (a.GetName() == sel) {
+            const float qmin = fedit_[0]->text().toFloat();
+            const float qmax = fedit_[1]->text().toFloat();
+            const float phimin = fedit_[2]->text().toFloat();
+            const float phimax = fedit_[3]->text().toFloat();
+            const float d_min = (qmax > 0) ? 2.0f * static_cast<float>(PI) / qmax : a.GetDMin_A();
+            const float d_max = (qmin > 0) ? 2.0f * static_cast<float>(PI) / qmin : a.GetDMax_A();
+            a = ROIAzimuthal(sel, d_min, d_max, phimin, phimax);
+            changed = true; break;
+        }
+
+    if (changed)
+        emit roisChanged(rois_);
+}
+
 void JFJochViewerROIList::loadImage(std::shared_ptr<const JFJochReaderImage> image) {
     image_ = image;
     const QString keep = SelectedName();
     rois_ = image_ ? image_->Dataset().experiment.ROI().GetROIDefinition() : ROIDefinition{};
     RebuildCombo(keep);
     ShowSelectedResult();
+    UpdateEditor();
 }
 
 void JFJochViewerROIList::RebuildCombo(const QString &keep_selected) {
@@ -103,6 +184,7 @@ void JFJochViewerROIList::OnSelectionChanged() {
     if (rebuilding_)
         return;
     ShowSelectedResult();
+    UpdateEditor();
     emit selectedROIChanged(SelectedName());
 }
 
diff --git a/viewer/widgets/JFJochViewerROIList.h b/viewer/widgets/JFJochViewerROIList.h
index f3b0650a..5a6afe41 100644
--- a/viewer/widgets/JFJochViewerROIList.h
+++ b/viewer/widgets/JFJochViewerROIList.h
@@ -7,6 +7,8 @@
 
 #include <QWidget>
 #include <QComboBox>
+#include <QLineEdit>
+#include <QLabel>
 
 #include "JFJochViewerROIResult.h"
 #include "../../common/ROIDefinition.h"
@@ -21,6 +23,8 @@ class JFJochViewerROIList : public QWidget {
 
     QComboBox *combo_;
     QComboBox *type_combo_;
+    QLabel *flabel_[4];
+    QLineEdit *fedit_[4];
     JFJochViewerROIResult *result_;
 
     ROIDefinition rois_;
@@ -28,6 +32,8 @@ class JFJochViewerROIList : public QWidget {
     bool rebuilding_ = false;
 
     void RebuildCombo(const QString &keep_selected);
+    void UpdateEditor();   // populate the numeric fields for the selected ROI
+    void ApplyEditor();    // rebuild the selected ROI from the numeric fields
     void ShowSelectedResult();
     [[nodiscard]] QString SelectedName() const;
     [[nodiscard]] std::string UniqueName() const;