diff --git a/erpnext/hr/page/organizational_chart/organizational_chart.py b/erpnext/hr/page/organizational_chart/organizational_chart.py
index 3674912dc06..717b56138e5 100644
--- a/erpnext/hr/page/organizational_chart/organizational_chart.py
+++ b/erpnext/hr/page/organizational_chart/organizational_chart.py
@@ -1,4 +1,5 @@
 import frappe
+from frappe.query_builder.functions import Count
 
 
 @frappe.whitelist()
@@ -15,31 +16,34 @@ def get_children(parent=None, company=None, exclude_node=None):
 	if exclude_node:
 		filters.append(["name", "!=", exclude_node])
 
-	employees = frappe.get_list(
+	employees = frappe.get_all(
 		"Employee",
-		fields=["employee_name as name", "name as id", "reports_to", "image", "designation as title"],
+		fields=[
+			"employee_name as name",
+			"name as id",
+			"lft",
+			"rgt",
+			"reports_to",
+			"image",
+			"designation as title",
+		],
 		filters=filters,
 		order_by="name",
 	)
 
 	for employee in employees:
-		is_expandable = frappe.db.count("Employee", filters={"reports_to": employee.get("id")})
-		employee.connections = get_connections(employee.id)
-		employee.expandable = 1 if is_expandable else 0
+		employee.connections = get_connections(employee.id, employee.lft, employee.rgt)
+		employee.expandable = bool(employee.connections)
 
 	return employees
 
 
-def get_connections(employee):
-	num_connections = 0
+def get_connections(employee: str, lft: int, rgt: int) -> int:
+	Employee = frappe.qb.DocType("Employee")
+	query = (
+		frappe.qb.from_(Employee)
+		.select(Count(Employee.name))
+		.where((Employee.lft > lft) & (Employee.rgt < rgt))
+	).run()
 
-	nodes_to_expand = frappe.get_list("Employee", filters=[["reports_to", "=", employee]])
-	num_connections += len(nodes_to_expand)
-
-	while nodes_to_expand:
-		parent = nodes_to_expand.pop(0)
-		descendants = frappe.get_list("Employee", filters=[["reports_to", "=", parent.name]])
-		num_connections += len(descendants)
-		nodes_to_expand.extend(descendants)
-
-	return num_connections
+	return query[0][0]
diff --git a/erpnext/hr/page/organizational_chart/test_organizational_chart.py b/erpnext/hr/page/organizational_chart/test_organizational_chart.py
new file mode 100644
index 00000000000..1c3c24845c5
--- /dev/null
+++ b/erpnext/hr/page/organizational_chart/test_organizational_chart.py
@@ -0,0 +1,52 @@
+# Copyright (c) 2022, Frappe Technologies Pvt. Ltd. and Contributors
+# License: GNU General Public License v3. See license.txt
+
+import unittest
+
+import frappe
+from frappe.tests.utils import FrappeTestCase
+
+from erpnext.hr.doctype.employee.test_employee import make_employee
+from erpnext.hr.page.organizational_chart.organizational_chart import get_children
+
+
+class TestOrganizationalChart(FrappeTestCase):
+	def setUp(self):
+		self.company = create_company("Test Org Chart").name
+		frappe.db.delete("Employee", {"company": self.company})
+
+	def test_get_children(self):
+		company = create_company("Test Org Chart").name
+		emp1 = make_employee("testemp1@mail.com", company=self.company)
+		emp2 = make_employee("testemp2@mail.com", company=self.company, reports_to=emp1)
+		emp3 = make_employee("testemp3@mail.com", company=self.company, reports_to=emp1)
+		make_employee("testemp4@mail.com", company=self.company, reports_to=emp2)
+
+		# root node
+		children = get_children(company=self.company)
+		self.assertEqual(len(children), 1)
+		self.assertEqual(children[0].id, emp1)
+		self.assertEqual(children[0].connections, 3)
+
+		# root's children
+		children = get_children(parent=emp1, company=self.company)
+		self.assertEqual(len(children), 2)
+		self.assertEqual(children[0].id, emp2)
+		self.assertEqual(children[0].connections, 1)
+		self.assertEqual(children[1].id, emp3)
+		self.assertEqual(children[1].connections, 0)
+
+
+def create_company(name):
+	if frappe.db.exists("Company", name):
+		return frappe.get_doc("Company", name)
+
+	company = frappe.new_doc("Company")
+	company.update(
+		{
+			"company_name": name,
+			"default_currency": "USD",
+			"country": "United States",
+		}
+	)
+	return company.insert()