diff --git a/get-shit-done/bin/lib/commands.cjs b/get-shit-done/bin/lib/commands.cjs
index 6978f6365..4f23c5dfb 100644
--- a/get-shit-done/bin/lib/commands.cjs
+++ b/get-shit-done/bin/lib/commands.cjs
@@ -421,7 +421,7 @@ function cmdProgressRender(cwd, format, raw) {
     }
   } catch {}
 
-  const percent = totalPlans > 0 ? Math.round((totalSummaries / totalPlans) * 100) : 0;
+  const percent = totalPlans > 0 ? Math.min(100, Math.round((totalSummaries / totalPlans) * 100)) : 0;
 
   if (format === 'table') {
     // Render markdown table
diff --git a/get-shit-done/bin/lib/roadmap.cjs b/get-shit-done/bin/lib/roadmap.cjs
index 8aa08b4d6..b9cc5b416 100644
--- a/get-shit-done/bin/lib/roadmap.cjs
+++ b/get-shit-done/bin/lib/roadmap.cjs
@@ -208,7 +208,7 @@ function cmdRoadmapAnalyze(cwd, raw) {
     completed_phases: completedPhases,
     total_plans: totalPlans,
     total_summaries: totalSummaries,
-    progress_percent: totalPlans > 0 ? Math.round((totalSummaries / totalPlans) * 100) : 0,
+    progress_percent: totalPlans > 0 ? Math.min(100, Math.round((totalSummaries / totalPlans) * 100)) : 0,
     current_phase: currentPhase ? currentPhase.number : null,
     next_phase: nextPhase ? nextPhase.number : null,
     missing_phase_details: missingDetails.length > 0 ? missingDetails : null,
diff --git a/get-shit-done/bin/lib/state.cjs b/get-shit-done/bin/lib/state.cjs
index 039574439..456f6517a 100644
--- a/get-shit-done/bin/lib/state.cjs
+++ b/get-shit-done/bin/lib/state.cjs
@@ -238,7 +238,7 @@ function cmdStateUpdateProgress(cwd, raw) {
     }
   }
 
-  const percent = totalPlans > 0 ? Math.round(totalSummaries / totalPlans * 100) : 0;
+  const percent = totalPlans > 0 ? Math.min(100, Math.round(totalSummaries / totalPlans * 100)) : 0;
   const barWidth = 10;
   const filled = Math.round(percent / 100 * barWidth);
   const bar = '\u2588'.repeat(filled) + '\u2591'.repeat(barWidth - filled);
diff --git a/tests/commands.test.cjs b/tests/commands.test.cjs
index a6d776d8e..a7342b4c0 100644
--- a/tests/commands.test.cjs
+++ b/tests/commands.test.cjs
@@ -473,6 +473,34 @@ describe('progress command', () => {
     assert.ok(result.output.includes('Phase'), 'should have table header');
     assert.ok(result.output.includes('foundation'), 'should include phase name');
   });
+
+  test('does not crash when summaries exceed plans (orphaned SUMMARY.md)', () => {
+    fs.writeFileSync(
+      path.join(tmpDir, '.planning', 'ROADMAP.md'),
+      `# Roadmap v1.0 MVP\n`
+    );
+    const p1 = path.join(tmpDir, '.planning', 'phases', '01-foundation');
+    fs.mkdirSync(p1, { recursive: true });
+    // 1 plan but 2 summaries (orphaned SUMMARY.md after PLAN.md deletion)
+    fs.writeFileSync(path.join(p1, '01-01-PLAN.md'), '# Plan');
+    fs.writeFileSync(path.join(p1, '01-01-SUMMARY.md'), '# Done');
+    fs.writeFileSync(path.join(p1, '01-02-SUMMARY.md'), '# Orphaned summary');
+
+    // bar format - should not crash with RangeError
+    const barResult = runGsdTools('progress bar --raw', tmpDir);
+    assert.ok(barResult.success, `Bar format crashed: ${barResult.error}`);
+    assert.ok(barResult.output.includes('100%'), 'percent should be clamped to 100%');
+
+    // table format - should not crash with RangeError
+    const tableResult = runGsdTools('progress table --raw', tmpDir);
+    assert.ok(tableResult.success, `Table format crashed: ${tableResult.error}`);
+
+    // json format - percent should be clamped
+    const jsonResult = runGsdTools('progress json', tmpDir);
+    assert.ok(jsonResult.success, `JSON format crashed: ${jsonResult.error}`);
+    const output = JSON.parse(jsonResult.output);
+    assert.ok(output.percent <= 100, `percent should be <= 100 but got ${output.percent}`);
+  });
 });
 
 // ─────────────────────────────────────────────────────────────────────────────