This study was designed to build and test the validity and reliability of the Anxiety Level Inventory (ALI). The ALI questionnaire was developed to assess the level of anxiety of an individual. This inventory is un-dimensional as it is built on the symptoms of anxiety, behavioral and cognitive disorders based on the theory of General Anxiety Disorder (GAD). This Anxiety Level Inventory is easy to administer as it only takes 10 to 15 minutes. This inventory is suitable to run at the age of 15 and above, male and female gender and multicultural. This test is also appropriate to administer in groups or individually. The inventory consisted of 21 items consisting of negative and positive statements to prevent respondents from responding to the inventory arbitrarily. This Anxiety Level Inventory uses the Likert scale of Never, Sometimes and Always. The validity of ALI content was evaluated by 12 experts comprising of government and private staff, as well as guidance and counseling teachers. A total of 82 respondents answered this ALI through a 'Google doc' application consisting of UPSI students as well as guidance and counseling students. Overall validity was moderate to high of 0.617 (61.7%). The reliability value shows a high value of Cronbach alpha with .865. As such, this study produced an ALI questionnaire with good validity and reliability for use in the field of guidance and counseling in Malaysia.