diff --git a/addons/hr_timesheet/models/project_task.py b/addons/hr_timesheet/models/project_task.py
index 3ee502ad559..8dea201957d 100644
--- a/addons/hr_timesheet/models/project_task.py
+++ b/addons/hr_timesheet/models/project_task.py
@@ -65,12 +65,12 @@ class Task(models.Model):
     def _compute_effective_hours(self):
         if not any(self._ids):
             for task in self:
-                task.effective_hours = round(sum(task.timesheet_ids.mapped('unit_amount')), 2)
+                task.effective_hours = sum(task.timesheet_ids.mapped('unit_amount'))
             return
         timesheet_read_group = self.env['account.analytic.line']._read_group([('task_id', 'in', self.ids)], ['task_id'], ['unit_amount:sum'])
         timesheets_per_task = {task.id: amount for task, amount in timesheet_read_group}
         for task in self:
-            task.effective_hours = round(timesheets_per_task.get(task.id, 0.0), 2)
+            task.effective_hours = timesheets_per_task.get(task.id, 0.0)
 
     @api.depends('effective_hours', 'subtask_effective_hours', 'planned_hours')
     def _compute_progress_hours(self):
diff --git a/addons/hr_timesheet/tests/test_timesheet.py b/addons/hr_timesheet/tests/test_timesheet.py
index 197086c5348..eb414391ba7 100644
--- a/addons/hr_timesheet/tests/test_timesheet.py
+++ b/addons/hr_timesheet/tests/test_timesheet.py
@@ -665,3 +665,31 @@ class TestTimesheet(TestCommonTimesheet):
 
         with self.assertRaises(UserError):
             self.task1.write({'project_id': False, 'parent_id': False})
+
+    def test_percentage_of_planned_hours(self):
+        """ Test the percentage of planned hours on a task. """
+        self.task1.planned_hours = 11/60
+        self.assertEqual(self.task1.effective_hours, 0, 'No timesheet should be created yet.')
+        self.assertEqual(self.task1.progress, 0, 'No timesheet should be created yet.')
+        self.env['account.analytic.line'].create([
+            {
+                'name': 'Timesheet',
+                'project_id': self.project_customer.id,
+                'task_id': self.task1.id,
+                'unit_amount': 3/60,
+                'employee_id': self.empl_employee.id,
+            }, {
+                'name': 'Timesheet',
+                'project_id': self.project_customer.id,
+                'task_id': self.task1.id,
+                'unit_amount': 4/60,
+                'employee_id': self.empl_employee.id,
+            }, {
+                'name': 'Timesheet',
+                'project_id': self.project_customer.id,
+                'task_id': self.task1.id,
+                'unit_amount': 4/60,
+                'employee_id': self.empl_employee.id,
+            },
+        ])
+        self.assertEqual(self.task1.progress, 100, 'The percentage of planned hours should be 100%.')