diff --git a/cursors.cpp b/cursors.cpp
index 6995ddb..909d934 100644
--- a/cursors.cpp
+++ b/cursors.cpp
@@ -89,3 +89,14 @@ void Cursors::paintFront(QPainter &painter, QRect &rect, range_t<off_t> sampleRa
 
     painter.restore();
 }
+
+range_t<int> Cursors::selection()
+{
+    // TODO: ensure correct ordering during dragging, not here
+    if (cursorPositions[0] < cursorPositions[1]) {
+        return {cursorPositions[0], cursorPositions[1]};
+
+    } else {
+        return {cursorPositions[1], cursorPositions[0]};
+    }
+}
diff --git a/cursors.h b/cursors.h
index ef02964..96d3b4c 100644
--- a/cursors.h
+++ b/cursors.h
@@ -31,6 +31,7 @@ class Cursors : public QObject
 public:
     Cursors(QObject * parent);
     void paintFront(QPainter &painter, QRect &rect, range_t<off_t> sampleRange);
+    range_t<int> selection();
 
 signals:
 	void cursorsMoved();
diff --git a/mainwindow.cpp b/mainwindow.cpp
index d66d449..cdd26b0 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -36,6 +36,7 @@ MainWindow::MainWindow()
     plots = new PlotView(input);
     setCentralWidget(plots);
 
+    // Connect dock inputs
     connect(dock, SIGNAL(openFile(QString)), this, SLOT(openFile(QString)));
     connect(dock->sampleRate, SIGNAL(textChanged(QString)), this, SLOT(setSampleRate(QString)));
     connect(dock, SIGNAL(fftSizeChanged(int)), plots, SLOT(setFFTSize(int)));
@@ -44,6 +45,9 @@ MainWindow::MainWindow()
     connect(dock->powerMinSlider, SIGNAL(valueChanged(int)), plots, SLOT(setPowerMin(int)));
     connect(dock->cursorsCheckBox, &QCheckBox::stateChanged, plots, &PlotView::enableCursors);
 
+    // Connect dock outputs
+    connect(plots, SIGNAL(timeSelectionChanged(float)), dock, SLOT(timeSelectionChanged(float)));
+
     // Set defaults after making connections so everything is in sync
     dock->setDefaults();
 }
diff --git a/plotview.cpp b/plotview.cpp
index 7f143cf..636cf5b 100644
--- a/plotview.cpp
+++ b/plotview.cpp
@@ -95,6 +95,10 @@ TracePlot* PlotView::createQuadratureDemodPlot(SampleSource<std::complex<float>>
 
 void PlotView::cursorsMoved()
 {
+    int selection = cursors.selection().length();
+    off_t sampleCount = coordToSample(selection);
+    float selectionTime = sampleCount / (float)mainSampleSource->rate();
+    emit timeSelectionChanged(selectionTime);
     viewport()->update();
 }
 
diff --git a/plotview.h b/plotview.h
index 22d31b6..7a7da49 100644
--- a/plotview.h
+++ b/plotview.h
@@ -36,6 +36,9 @@ class PlotView : public QAbstractScrollArea, Subscriber
 public:
     PlotView(InputSource *input);
 
+signals:
+    void timeSelectionChanged(float time);
+
 public slots:
     void cursorsMoved();
     void enableCursors(bool enable);
diff --git a/spectrogramcontrols.cpp b/spectrogramcontrols.cpp
index 17fbee9..415393b 100644
--- a/spectrogramcontrols.cpp
+++ b/spectrogramcontrols.cpp
@@ -112,3 +112,9 @@ void SpectrogramControls::fileOpenButtonClicked()
                        );
     emit openFile(fileName);
 }
+
+void SpectrogramControls::timeSelectionChanged(float time)
+{
+    deltaTimeLabel->setText(QString::number(time) + "s");
+    deltaFrequencyLabel->setText(QString::number(1 / time) + "Hz");
+}
diff --git a/spectrogramcontrols.h b/spectrogramcontrols.h
index af1f2a7..20a7345 100644
--- a/spectrogramcontrols.h
+++ b/spectrogramcontrols.h
@@ -39,6 +39,9 @@ signals:
     void fftSizeChanged(int size);
     void openFile(QString fileName);
 
+public slots:
+    void timeSelectionChanged(float time);
+
 private slots:
     void fftSizeSliderChanged(int size);
     void fileOpenButtonClicked();