diff --git a/frontend/src/components/ExperimentCalendar.jsx b/frontend/src/components/ExperimentCalendar.jsx
index 2d53ae7..63deb5b 100644
--- a/frontend/src/components/ExperimentCalendar.jsx
+++ b/frontend/src/components/ExperimentCalendar.jsx
@@ -53,25 +53,22 @@ function DayPanel({ date, animals, allStatuses, template, experimentId, selected
 
   const fieldLabel = fieldOptions.find((f) => f.value === selectedField)?.label;
 
-  // Bar chart: this day's field value per animal (numeric only, filtered to animals present that day)
+  // Bar chart: animals with analysis_summary on this day → Success/Failure/Total from that summary
   const barData = useMemo(() => {
-    if (!selectedField) return [];
-    const isBuiltin = BUILTIN_KEYS_SET.has(selectedField);
     return animalsWithData
       .map((animal) => {
         const status = statusByAnimal[animal.id];
-        if (!status) return null;
-        const raw = isBuiltin ? status[selectedField] : status.custom_fields?.[selectedField];
-        if (raw === null || raw === undefined || String(raw).trim() === '') return null;
-        const num = parseFloat(raw);
-        if (isNaN(num)) return null;
+        const summary = status?.analysis_summary;
+        if (!summary || summary.total === 0) return null;
         return {
           name: animal.animal_name || animal.animal_id_string || animal.id.slice(0, 8),
-          value: num,
+          total: summary.total,
+          success: summary.counts?.Success ?? 0,
+          failure: summary.counts?.Failure ?? 0,
         };
       })
       .filter(Boolean);
-  }, [animalsWithData, statusByAnimal, selectedField]);
+  }, [animalsWithData, statusByAnimal]);
 
   return (
     <div className="space-y-3 max-h-[80vh] overflow-y-auto pr-1">
@@ -120,16 +117,17 @@ function DayPanel({ date, animals, allStatuses, template, experimentId, selected
       {/* Bar chart: overall per-subject completeness */}
       {barData.length > 0 && (
         <div className="mt-4 pt-4 border-t border-gray-100">
-          <h4 className="text-sm font-semibold text-gray-700 mb-3">
-            {fieldLabel ?? 'Field'} — this session
-          </h4>
+          <h4 className="text-sm font-semibold text-gray-700 mb-3">Session metrics</h4>
           <ResponsiveContainer width="100%" height={200}>
             <BarChart data={barData} margin={{ top: 4, right: 16, left: 0, bottom: 4 }}>
               <CartesianGrid strokeDasharray="3 3" stroke="#f0f0f0" />
               <XAxis dataKey="name" tick={{ fontSize: 11 }} />
               <YAxis tick={{ fontSize: 11 }} />
-              <Tooltip formatter={(v) => [v, fieldLabel ?? 'Value']} />
-              <Bar dataKey="value" name={fieldLabel ?? 'Value'} fill="#6366f1" radius={[3, 3, 0, 0]} />
+              <Tooltip />
+              <Legend wrapperStyle={{ fontSize: 11 }} />
+              <Bar dataKey="total" name="Total" fill="#94a3b8" radius={[3, 3, 0, 0]} />
+              <Bar dataKey="success" name="Success" fill="#22c55e" radius={[3, 3, 0, 0]} />
+              <Bar dataKey="failure" name="Failure" fill="#f87171" radius={[3, 3, 0, 0]} minPointSize={2} />
             </BarChart>
           </ResponsiveContainer>
         </div>
diff --git a/frontend/tests/ExperimentCalendar.test.jsx b/frontend/tests/ExperimentCalendar.test.jsx
index 7aefa27..589cfcf 100644
--- a/frontend/tests/ExperimentCalendar.test.jsx
+++ b/frontend/tests/ExperimentCalendar.test.jsx
@@ -38,7 +38,7 @@ function todayStr() {
   return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')}`;
 }
 
-function makeStatus(animalId, date, customFields = {}, vitals = null) {
+function makeStatus(animalId, date, customFields = {}, vitals = null, analysisSummary = null) {
   return {
     id: `s-${animalId}-${date}`,
     animal_id: animalId,
@@ -48,6 +48,7 @@ function makeStatus(animalId, date, customFields = {}, vitals = null) {
     treatment: null,
     notes: null,
     custom_fields: customFields,
+    analysis_summary: analysisSummary,
   };
 }
 
@@ -248,10 +249,11 @@ describe('day click modal', () => {
 // ── Bar chart (inside day modal) ──────────────────────────────────────────────
 
 describe('bar chart inside day modal', () => {
-  it('renders bar chart with that day\'s numeric field values', async () => {
+  it('renders session metrics bar chart when analysis_summary has data', async () => {
     const dateStr = todayStr();
+    const summary = { total: 18, counts: { Success: 5, Failure: 13 }, success_rate: 0.28 };
     const statuses = [
-      makeStatus('a1000000-0000-0000-0000-000000000001', dateStr, { 'ww000000-0000-0000-0000-000000000099': '325' }),
+      makeStatus('a1000000-0000-0000-0000-000000000001', dateStr, { 'ww000000-0000-0000-0000-000000000099': '325' }, null, summary),
     ];
     render(
       <ExperimentCalendar experimentId={EXP_ID} template={TEMPLATE} allStatuses={statuses} animals={ANIMALS} />,
@@ -262,31 +264,16 @@ describe('bar chart inside day modal', () => {
     });
   });
 
-  it('omits animals with empty or non-numeric field value from bar chart', async () => {
+  it('hides bar chart when no animal has analysis_summary with total > 0', async () => {
     const dateStr = todayStr();
-    // Rat A has numeric weight; Rat B has empty weight — Rat B excluded from chart but shown in day list
     const statuses = [
       makeStatus('a1000000-0000-0000-0000-000000000001', dateStr, { 'ww000000-0000-0000-0000-000000000099': '325' }),
-      makeStatus('a2000000-0000-0000-0000-000000000002', dateStr, {}),
     ];
     render(
       <ExperimentCalendar experimentId={EXP_ID} template={TEMPLATE} allStatuses={statuses} animals={ANIMALS} />,
     );
     fireEvent.click(screen.getByTestId(`day-${dateStr}`));
     await waitFor(() => screen.getByRole('dialog'));
-    expect(screen.getByTestId('bar-chart')).toBeInTheDocument();
-  });
-
-  it('hides bar chart when no animals have a numeric value for the selected field that day', async () => {
-    const dateStr = todayStr();
-    // vitals is text — no bar chart
-    const statuses = [makeStatus('a1000000-0000-0000-0000-000000000001', dateStr, {}, 'HR 72')];
-    render(
-      <ExperimentCalendar experimentId={EXP_ID} template={TEMPLATE} allStatuses={statuses} animals={ANIMALS} />,
-    );
-    fireEvent.change(screen.getByTestId('field-select'), { target: { value: 'vitals' } });
-    fireEvent.click(screen.getByTestId(`day-${dateStr}`));
-    await waitFor(() => screen.getByRole('dialog'));
     expect(screen.queryByTestId('bar-chart')).not.toBeInTheDocument();
   });
 });