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Intolerance of Uncertainty Scale (IUS)

Intolerance of Uncertainty Scale (IUS) Test

In about 5 minutes, see how strongly uncertainty triggers stress, worry, or indecision. Get a fast, reliable snapshot to guide next steps for anxiety and avoidance.

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Questions: 275 minutes

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08:30

October 2, 2025

October 2, 2025
Material has been updated

October 2, 2025
Material has been published

16,444 views

1,396 completions

1,203 likes

Verified by Daniel Hall

Psychologist with 25 years of experience

Scale Explorer

How the Scales are Structured

example score

4/5

Disorganization (D)

Measures the extent to which uncertainty is experienced as disorganizing and uncomfortable without a clear plan or structure.

Comfort with ambiguity

Some need for structure

Strong need for order

1 – 2.3: Comfort with ambiguity | 2.4 – 3.6: Some need for structure | 3.7 – 5: Strong need for order

A score of 4 suggests a strong preference for order and a tendency to experience uncertain situations as particularly disorganizing or hard to tolerate.

example score

3/5

Source of Stress (SoS)

Measures the extent to which uncertainty is experienced as a source of stress and anxiety.

Low stress from uncertainty

Moderate stress from uncertainty

High stress from uncertainty

1 – 2.3: Low stress from uncertainty | 2.4 – 3.6: Moderate stress from uncertainty | 3.7 – 5: High stress from uncertainty

A score of 3 indicates a moderate level of stress in uncertain situations, suggesting occasional emotional tension and some hesitancy when outcomes are unclear.

example score

2/5

Interference With Productivity (IWP)

Measures how much uncertainty disrupts planning, organization, and day-to-day productivity.

Low impact

Moderate impact

High impact

1 – 2.3: Low impact | 2.4 – 3.6: Moderate impact | 3.7 – 5: High impact

A score of 2 suggests uncertainty generally has a low impact on your ability to plan and stay productive.

example score

3/5

Inability to Relax (ItR)

Measures how difficult it is to relax or rest when outcomes are uncertain.

Easier to unwind

Mixed tension

Hard to relax

1 – 2.4: Easier to unwind | 2.5 – 3.4: Mixed tension | 3.5 – 5: Hard to relax

A score of 3 suggests a moderate tendency to feel tense and have trouble fully relaxing in uncertain situations.

example score

3/5

Inability to Act (ItA)

Measures how much uncertainty interferes with decision-making and taking action.

Low difficulty acting

Moderate difficulty acting

High difficulty acting

1 – 2.3: Low difficulty acting | 2.4 – 3.6: Moderate difficulty acting | 3.7 – 5: High difficulty acting

A score of 3 suggests a moderate tendency to hesitate or feel slowed down when decisions must be made without clear outcomes.

example score

3/5

Intolerance of Uncertainty (IoU)

Measures how uncomfortable and stressed a person tends to feel when situations are uncertain or outcomes are unpredictable.

Low

Moderate

High

1 – 2.3: Low | 2.4 – 3.6: Moderate | 3.7 – 5: High

A score of 3 suggests a moderate intolerance of uncertainty, meaning unclear outcomes may sometimes trigger tension or hesitation but are not consistently overwhelming.

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DATA-BASED USER COHORTS

Who Usually Takes This Test?

Anxious overthinkers

41%OF USERS

People who feel tense when outcomes are unclear and find themselves stuck in worry or needing constant reassurance.

Decision-stuck planners

34%OF USERS

People who delay choices, over-prepare, or avoid taking action because they can’t be sure they’ll get the “right” result.

Clients in major transitions

25%OF USERS

People facing health, relationship, or career changes who notice uncertainty spiking their stress and avoidance.

BASED ON AGGREGATED, ANONYMIZED DATA FROM TENS OF THOUSANDS OF FREUDLY USERS.

RESULTS YOU CAN ACTUALLY USE

Scale Results
— Explained Clearly

Your scores across each test scale are translated into plain, usable insights. You won’t just get numbers — you’ll learn how your results impact your daily life, emotional state, and overall well-being.

AI-Powered
Interpretation

You’ll receive a structured, clinically-grounded explanation. Our AI analyzes patterns and relationships between scales to provide a coherent interpretation, without exaggerated language.

Statistical
Comparison

See how your results compare to others. Anonymized platform data is used to create a percentile scale, which identifies whether your results are typical.

Practical
Recommendations

You’ll receive clear, actionable guidance tailored to your profile. These easy-to-implement suggestions focus on coping, self-regulation, and realistic next steps.

AI-Powered
Insights

Get insights on behavioral and thought patterns you might not notice on your own. By uncovering subtle connections between your responses, you’ll better understand what may be driving your current results.

Discuss with
an AI Therapist

Clarify, reflect, and explore your results right away. Talk through your experience, ask questions, and explore meanings in a calm, non-diagnostic dialogue.

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Used in 52+ countries

Benchmarking

See How You Compare

Once you complete the test, your results are compared with real-world data from people in your country.
Below is a preview of how scores are typically distributed across each scale.

Disorganization (D)

Average

2.6

Normal range

2.1 — 3.1

min.

max.

Majority

This curve shows how scores are typically distributed.
Once you complete the test, your result will appear on the scale so you can see how you compare.

Source of Stress (SoS)

Average

2.6

Normal range

2 — 3.2

min.

max.

Majority

This curve shows how scores are typically distributed.
Once you complete the test, your result will appear on the scale so you can see how you compare.

Productivity Obstacle (PO)

Average

3.2

Normal range

2.6 — 3.8

min.

max.

Majority

This curve shows how scores are typically distributed.
Once you complete the test, your result will appear on the scale so you can see how you compare.

Inability to relax (Itr)

Average

3.8

Normal range

3.1 — 4.5

min.

max.

Majority

This curve shows how scores are typically distributed.
Once you complete the test, your result will appear on the scale so you can see how you compare.

Inability to Act (ItA)

Average

Normal range

1.3 — 2.7

min.

max.

Majority

This curve shows how scores are typically distributed.
Once you complete the test, your result will appear on the scale so you can see how you compare.

Intolerance of Uncertainty (IoU)

Average

3.2

Normal range

2.7 — 3.7

min.

max.

Majority

This curve shows how scores are typically distributed.
Once you complete the test, your result will appear on the scale so you can see how you compare.

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CLEAR ANSWERS TO COMMON QUESTIONS

Frequently Asked Questions

What does this questionnaire measure?

It measures how strongly uncertainty is experienced as distressing, disruptive, or hard to tolerate. It reflects reactions such as worry, tension, and difficulty deciding when outcomes are unclear.

How long does it take and how many items are included?

Completion typically takes about 5 minutes. The questionnaire contains 27 statements.

How should responses be selected?

Select the option that best matches typical thoughts and reactions, not a rare or extreme situation. Answer all items using the same timeframe and interpretation of the response options.

What does a higher score indicate?

Higher scores indicate greater difficulty tolerating uncertainty and a stronger tendency to experience it as upsetting or impairing. Scores are not diagnostic and should be interpreted with other clinical information.

Can results change over time?

Yes, scores may change with stress levels, life circumstances, or treatment. Repeated use can help track changes in responses to uncertainty.

WHAT THE TEST MEASURES

About This Assessment

Intolerance of Uncertainty Scale (IUS) Test - Symptoms and Signs

uncertainty tolerance

This self-report measure assesses an individual’s tendency to experience uncertainty as distressing and difficult to tolerate. The Intolerance of Uncertainty Scale (IUS) is commonly used to quantify uncertainty-related beliefs and reactions that may contribute to anxiety and avoidance.

The instrument includes 27 items and typically takes about 5 minutes to complete. Respondents rate statements reflecting emotional, cognitive, and behavioral responses to ambiguous or unpredictable situations; results provide a brief profile of uncertainty sensitivity.

In clinical and research settings, the Intolerance of Uncertainty Scale (IUS) can support case formulation by identifying a potentially relevant vulnerability factor associated with anxiety-related symptoms, decision-making difficulties, and maladaptive coping patterns. Scores should be interpreted in context of presenting concerns and in conjunction with other assessment information.

Author: michel-dugas, robert-ladouceur

Literature: Carleton, R. N. The intolerance of uncertainty construct in the context of anxiety disorders: Theoretical and practical perspectives. Expert Review of Neurotherapeutics. 2016.; Buhr, K., & Dugas, M. J. The intolerance of uncertainty scale: Psychometric properties of the English version. Behaviour Research and Therapy. 2002.

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