Anxiety can be measured through standardized questionnaires, physical biomarkers, wearable technology, and simple self-rating techniques. The most widely used method is a short screening questionnaire called the GAD-7, which takes under two minutes and produces a score from 0 to 21 that maps directly to severity levels. But there are several other approaches worth knowing about, whether you’re tracking your own anxiety at home or preparing for a clinical evaluation.
Quick Self-Rating With the SUDS Scale
The simplest way to measure anxiety in the moment is the Subjective Units of Distress Scale, or SUDS. Developed for use in cognitive behavioral therapy, it asks you to rate your distress on a scale from 0 to 100. Zero means complete calmness, no anxiety at all. Scores from 20 to 40 represent moderate, definitely unpleasant anxiety. Scores of 40 to 60 indicate severe, considerable distress. Anything above 80 means very severe anxiety approaching panic.
SUDS is useful not because it’s precise, but because it gives you a consistent personal benchmark. If you rate yourself several times a day over weeks, you start to see patterns: which situations spike your score, what time of day tends to be worst, whether a new habit or treatment is actually shifting things. Therapists often ask clients to use SUDS ratings during exposure therapy to track how distress drops over repeated sessions.
The GAD-7: The Standard Screening Tool
The Generalized Anxiety Disorder 7-item scale is the most common anxiety questionnaire used in primary care and mental health settings. It lists seven symptoms, including feeling nervous, uncontrollable worrying, trouble relaxing, and irritability, and asks how often each has bothered you over the past two weeks. You score each item from 0 (not at all) to 3 (nearly every day), giving a total between 0 and 21.
The score breaks down like this:
- 0 to 4: Minimal anxiety
- 5 to 9: Mild anxiety
- 10 to 14: Moderate anxiety
- 15 and above: Severe anxiety
A score of 10 or higher is generally considered the threshold where treatment is worth discussing. The GAD-7 is freely available online, and many therapists use it at every session to track progress over time. It’s not a diagnosis on its own, but it’s a reliable signal of where you stand.
The Beck Anxiety Inventory
The Beck Anxiety Inventory, or BAI, takes a different angle. Instead of focusing on worry and apprehension, it emphasizes the physical symptoms of anxiety: numbness, dizziness, heart pounding, hands trembling, feeling hot. It lists 21 symptoms and asks you to rate each from 0 (not at all) to 3 (severely) based on the past week. The total score ranges from 0 to 63.
- 0 to 7: Minimal anxiety
- 8 to 15: Mild anxiety
- 16 to 25: Moderate anxiety
- 26 and above: Severe anxiety
Because the BAI leans heavily on physical sensations, it’s especially useful if your anxiety shows up more in your body than in your thoughts. It’s also good at distinguishing anxiety from depression, since the two often overlap and can be hard to tease apart on questionnaires that focus purely on mood and worry.
Clinician-Rated Scales
Some anxiety measures are designed to be administered by a trained professional rather than filled out on your own. The Hamilton Anxiety Rating Scale consists of 14 items covering both psychological symptoms (tension, fears, insomnia) and physical ones (cardiovascular, respiratory, gastrointestinal). A clinician rates each item based on a structured interview, which allows for more nuanced scoring than a self-report questionnaire can capture.
These clinician-rated tools tend to be used in research settings or when a more detailed clinical picture is needed. If your provider uses one, the process typically involves a 15- to 20-minute conversation rather than a paper form.
Measuring Anxiety in Children
Children and teenagers need different tools because their anxiety often looks different from adult anxiety. The Screen for Child Anxiety Related Disorders, known as SCARED, is a 41-item questionnaire with both a child version and a parent version. Each item is scored 0, 1, or 2, and a total score of 25 or higher suggests an anxiety disorder may be present. Scores above 30 are more specific.
What makes SCARED particularly useful is that it breaks anxiety into subtypes. A score of 9 or higher on a specific subset of questions points toward generalized anxiety. A score of 8 or higher on another subset suggests social anxiety. Separate cutoffs exist for separation anxiety, panic symptoms, and school avoidance. This helps parents and clinicians understand not just whether a child is anxious, but what kind of anxiety is driving the problem.
Physical Biomarkers of Anxiety
Anxiety isn’t just a feeling. It produces measurable changes in your body, and several of these can be tracked.
Heart rate variability (HRV), the variation in time between consecutive heartbeats, is the most studied physical marker. A large meta-analysis covering over 2,500 participants found that people with anxiety disorders consistently show lower HRV than people without them. This held true across panic disorder, generalized anxiety, social anxiety, and PTSD. Lower HRV reflects reduced activity in the body’s calming system (the vagus nerve), which helps explain why anxious people often feel physically “revved up” even at rest. The effect was moderate for generalized and social anxiety and smaller but still significant for panic disorder and PTSD.
Skin conductance is another measurable signal. When your sympathetic nervous system activates, sweat glands on your palms and fingertips produce more moisture, making your skin conduct electricity more easily. Fear and anxiety are associated with increased skin conductance. This is the same principle behind older polygraph tests, though in a clinical context it’s measured with small electrodes on the fingers.
Cortisol, a stress hormone, can be measured through saliva. Under normal conditions, cortisol follows a predictable daily rhythm: it peaks in the morning (around 15.5 nmol/L) and drops to roughly 3.9 nmol/L at night. Chronic anxiety can disrupt this pattern. However, salivary cortisol has limited value as a standalone anxiety measure because it responds to many types of stress and varies significantly between individuals.
What Wearable Devices Can and Cannot Do
Consumer wearables like smartwatches and fitness trackers now measure heart rate variability, skin temperature, and other signals that relate to anxiety. A 2023 systematic review and meta-analysis of studies using wearable devices with artificial intelligence to detect anxiety found a pooled accuracy of 81%. The devices were better at correctly identifying people who were not anxious (92% specificity) than at catching those who were (79% sensitivity).
In practical terms, this means a wearable that says you’re calm is probably right. But if it fails to flag an anxious episode, that doesn’t mean you’re fine. These tools are best used for spotting trends over weeks and months rather than diagnosing individual moments. Tracking your resting HRV over time and watching for a sustained downward trend can be a useful early warning sign, especially when paired with a periodic GAD-7 or SUDS check.
Clinical Diagnosis vs. Severity Measurement
It’s worth understanding the difference between measuring how anxious you feel and meeting the criteria for an anxiety disorder diagnosis. The diagnostic standard requires excessive anxiety and worry occurring more days than not for at least six months, about multiple areas of life (not just one specific concern). The worry also needs to be accompanied by three or more of six associated symptoms: restlessness, fatigue, difficulty concentrating, irritability, muscle tension, or sleep disturbance.
Screening tools like the GAD-7 can flag that your anxiety levels are elevated, but a diagnosis involves a clinician evaluating the duration, scope, and functional impact of your symptoms. Someone can score in the moderate range on the GAD-7 during a stressful month without having a diagnosable disorder, and someone with a long-standing anxiety condition might score lower on a good week.
For ongoing self-monitoring, the most practical approach combines a quick daily SUDS rating with a weekly or biweekly GAD-7. This gives you both a real-time snapshot and a structured trend line, which is exactly the kind of data that’s useful if you eventually bring it to a provider.