✍️ Written by SmartSleepCalc Editorial Team🩺 Reviewed by Dr. Sarah Mitchell, CCSH📅 Last reviewed: April 2026🔬 Based on STOP-BANG (Chung 2008)
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Sleep Apnea Risk Calculator
Free, clinically validated STOP-BANG sleep apnea risk calculator. Answer 8 questions about symptoms and physical measurements, receive your risk score (0–8), and get evidence-based next steps matched to your risk level. Based on the gold-standard screening tool used by sleep specialists worldwide.
⚕️ Clinically Validated STOP-BANG · Based on Chung et al. (2008)
⚕️ Medical Disclaimer: This sleep apnea risk calculator uses the validated STOP-BANG screening tool (Chung et al., 2008, Anesthesiology) — it is a screening instrument only, not a diagnostic tool. A STOP-BANG score cannot diagnose obstructive sleep apnea. Only a formal sleep study (polysomnography or home sleep test) interpreted by a licensed clinician can establish a diagnosis. If your score is 3 or above, or if you have concerning symptoms, consult your GP or a sleep medicine specialist promptly. This tool does not constitute medical advice.
📋 STOP Questions
Answer these 4 symptom-based questions
📊 BANG Measurements
Enter your physical measurements for an accurate score
💡 Measure at Adam’s apple level
—Your BMI (Body Mass Index)
STOP-BANG Score
0 / 8
✓ LOW RISK
📊—OSA Probability
📈—Likely Severity
🎯—Action Level
📝 Your Risk Assessment
📋 Recommended Next Steps
🚨 URGENT: High Risk Detected
Your STOP-BANG score indicates HIGH RISK (60–80% probability) of moderate-to-severe OSA. Untreated severe OSA significantly increases cardiovascular risk. Contact a sleep specialist within 1–2 weeks. Do not delay if you also have morning headaches, witnessed apneas, or excessive daytime sleepiness. Source: AASM Clinical Practice Guidelines.
What Is Sleep Apnea?
Sleep apnea is a serious, chronic medical condition in which breathing repeatedly stops and restarts during sleep. These pauses — called apneas — can last from a few seconds to more than a minute and may occur dozens or hundreds of times per night, triggering brief arousals, oxygen desaturations, and fragmented sleep architecture. Globally, an estimated 936 million adults aged 30–69 have mild-to-severe obstructive sleep apnea, with approximately 425 million experiencing moderate-to-severe disease that warrants treatment. Source: Benjafield et al. (2019) The Lancet Respiratory Medicine.
There are three recognised types. Obstructive sleep apnea (OSA) — the most common, accounting for over 90% of cases — occurs when the throat muscles relax during sleep and the soft tissue collapses inward, physically blocking airflow despite continued breathing effort. Central sleep apnea (CSA) is less common and involves the brain failing to send the correct signals to the breathing muscles; it is often associated with heart failure, opioid use, or high altitude. Complex (mixed) sleep apnea combines features of both. This sleep apnea risk calculator screens specifically for OSA using the validated STOP-BANG questionnaire. Only a sleep physician can distinguish between types after formal testing.
🔵 Global Prevalence — Benjafield et al. (2019)
936 million adults have mild-to-severe OSA worldwide · 425 million have moderate-to-severe OSA · Most cases remain undiagnosed · Women are 2–3× less likely to be diagnosed despite significant prevalence · Source: Benjafield AV et al., Lancet Respir Med 2019;7(8):687–698.
Sleep Apnea Symptoms — Beyond Snoring
Loud snoring is the most recognised symptom of OSA, but it is neither necessary nor sufficient for diagnosis. Many people with significant OSA do not snore loudly, and many loud snorers do not have OSA. The full symptom picture spans both nighttime and daytime and affects every aspect of daily functioning.
🌙 Nighttime Symptoms
During Sleep
Witnessed apneas — breathing pauses observed by a bed partner
Gasping or choking sounds during sleep
Nocturia — waking 2 or more times to urinate (a common but underrecognised sign)
Restless, thrashing sleep — frequent position changes
Night sweats, particularly around the head and neck
Acid reflux (GERD) worsened at night
☀️ Daytime Symptoms
During Waking Hours
Excessive daytime sleepiness — falling asleep during sedentary activities
Morning headaches, typically frontal, resolving within 30 minutes of waking
Unrefreshing sleep despite spending adequate time in bed
If you regularly wake unrefreshed, experience morning headaches, or have been told you stop breathing in your sleep, these symptoms warrant evaluation regardless of your STOP-BANG score. Source: AASM International Classification of Sleep Disorders, 3rd Ed.
Sleep Apnea Risk Factors
OSA arises from a combination of anatomical, physiological, and behavioural factors that narrow or collapse the upper airway during sleep. Understanding your risk profile helps contextualise your sleep apnea risk calculator result.
>40 cm men / >38 cm women — surrogate for pharyngeal fat loading
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Male Sex
2–3× higher risk than pre-menopausal women; androgens affect upper airway muscle tone
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Age >50
Airway muscle tone decreases with age; post-menopausal women approach male risk levels
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Alcohol Use
Relaxes pharyngeal muscles and blunts arousal response; worst within 4 h of bedtime
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Supine Position
Sleeping on your back doubles apnea frequency vs. lateral sleeping in many patients
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Family History
First-degree relatives of OSA patients have 2× higher risk — craniofacial anatomy is heritable
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Hypertension
Up to 30% of hypertensive patients have undiagnosed OSA; a bidirectional relationship
What Your Risk Score Means — and What to Do Next
0–2✅ Low Risk — Reassurance with Watchful Waiting
A score of 0–2 on the STOP-BANG indicates low OSA risk — approximately 15–20% probability of OSA in the general population. No immediate clinical referral is required. However, low risk does not mean no risk: if you have persistent symptoms (unrefreshing sleep, morning headaches, witnessed apneas) despite a low score, discuss them with your GP. Lifestyle measures are always appropriate: avoid alcohol within 4 hours of bedtime, maintain a healthy weight, and try sleeping on your side. Repeat this sleep apnea test annually if risk factors change. Source: Chung et al. (2008) Anesthesiology.
3–4⚠️ Intermediate Risk — Home Sleep Test Recommended
A score of 3–4 indicates intermediate risk — approximately 30–50% probability of OSA. The American Academy of Sleep Medicine (AASM) recommends that individuals at intermediate or higher STOP-BANG risk receive formal evaluation. Your first step is to see your GP and describe your symptoms clearly: mention snoring frequency, observed breathing pauses, morning headaches, and daytime sleepiness. Your GP may refer you directly for a home sleep test (HST) — a wrist-worn device that measures breathing effort, oxygen saturation, and airflow overnight in your own home. An HST is appropriate for uncomplicated OSA screening and typically costs significantly less than an in-lab study. In the meantime, avoid alcohol and sedatives near bedtime, and try lateral (side) sleeping. Do not ignore this result. Source: AASM Clinical Practice Guideline for Diagnostic Testing for Adult Obstructive Sleep Apnea (2017).
5–8🚨 High Risk — Urgent Sleep Medicine Referral Required
A score of 5–8 indicates high risk — approximately 60–80% probability of moderate-to-severe OSA. This is the most clinically significant category and requires prompt action. Untreated moderate-to-severe OSA is associated with a threefold increase in cardiovascular disease risk, a fourfold increase in stroke risk, significantly elevated road traffic accident risk, and accelerated cognitive decline. Do not minimise or ignore these symptoms. Contact your GP this week and request an urgent sleep medicine referral. You will likely require a formal sleep study — either a home sleep test or in-lab polysomnography. If morning headaches occur alongside severe daytime sleepiness and witnessed apneas, seek evaluation as a priority appointment rather than routine booking. Medical Disclaimer: A high STOP-BANG score identifies elevated risk — it does not constitute a diagnosis. Only a licensed sleep medicine physician can diagnose and treat obstructive sleep apnea based on a formal sleep study result. Source: AASM Guidelines; Benjafield et al. (2019).
How Sleep Apnea Is Diagnosed
Diagnosis of OSA requires objective measurement of breathing events during sleep. No questionnaire — including STOP-BANG — can replace this. There are two pathways, both interpreted by a sleep medicine physician or respiratory specialist.
🏥 In-Lab Polysomnography (PSG)
The gold standard test. An overnight stay in a sleep laboratory where trained technicians monitor brain waves (EEG), eye movements, muscle activity, heart rate, oxygen levels, airflow, and chest effort simultaneously. Measures the Apnea-Hypopnea Index (AHI): the number of breathing events per hour of sleep. Can detect all sleep disorders, not just OSA. Most accurate for complex presentations or when home testing is inadequate.
Gold Standard · Most Comprehensive
🏠 Home Sleep Apnea Test (HSAT)
A portable device worn at home overnight measuring airflow, respiratory effort, and blood oxygen saturation. Appropriate for patients with a high pre-test probability of uncomplicated OSA (e.g., STOP-BANG ≥3 with classic symptoms) and no significant comorbidities. Less comprehensive than PSG — cannot detect central sleep apnea or other sleep disorders. A negative home test in a high-risk patient should be followed by in-lab PSG. AASM-approved pathway for appropriate candidates.
Convenient · Lower Cost · AASM Approved
Sleep Apnea Treatment Overview
OSA is a treatable condition. Treatment selection depends on severity (AHI), patient anatomy, comorbidities, and preference. A sleep medicine physician will guide the decision after your sleep study result. The most effective treatments address the underlying cause — airway obstruction — rather than just managing symptoms.
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CPAP Therapy — First-Line for Moderate-Severe OSA
Continuous Positive Airway Pressure delivers a gentle stream of pressurised air through a mask, acting as a pneumatic splint that keeps the airway open throughout the night. When used consistently (≥4 hours per night on ≥70% of nights), CPAP eliminates virtually all apnea events and rapidly reverses daytime sleepiness, blood pressure elevation, and cognitive impairment. Modern CPAP devices are quiet, compact, and increasingly comfortable. Adherence is the main challenge — mask fit and gradual pressure acclimatisation significantly improve compliance. Source: AASM Clinical Practice Guidelines for CPAP.
✓ Most effective treatment available · 95%+ apnea reduction when used correctly
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Mandibular Advancement Device (MAD)
A custom-fitted oral appliance worn during sleep that advances the lower jaw forward, enlarging the pharyngeal airway and reducing collapsibility. Appropriate for mild-to-moderate OSA, or as an alternative to CPAP in patients who cannot tolerate it. Custom devices fitted by dental sleep medicine specialists significantly outperform over-the-counter variants. Side effects include temporary jaw soreness and tooth sensitivity, usually resolving over weeks.
✓ 50–70% effective for mild-moderate OSA · High patient acceptance
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Positional Therapy
For patients with positional OSA — where apneas occur predominantly in the supine (back-sleeping) position — devices that encourage or enforce lateral sleeping can reduce AHI by 50% or more. Options include vibrating position alarms, backpack-style devices, and positional pillows. Appropriate as monotherapy for mild positional OSA, or as adjunct therapy. Your sleep study report will indicate whether your OSA is positional.
✓ Highly effective for positional OSA · No equipment required for simple lateral positioning
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Weight Loss
Obesity is the single most important modifiable risk factor for OSA. A 10% reduction in body weight reduces AHI by approximately 30%, and weight loss of 15–20% can resolve OSA entirely in obesity-driven cases. Bariatric surgery produces the most dramatic results — AHI reductions of 70–80% have been documented. However, weight loss alone is not sufficient for moderate-to-severe OSA and should be pursued alongside CPAP or oral appliance therapy, not instead of it.
✓ 10% weight loss → ~30% AHI reduction · Disease-modifying if sustained
⚡ When to Act Urgently
Some symptom combinations require you to see a doctor as a priority appointment this week — not at your next routine check-up. Seek urgent evaluation if you have: morning headaches occurring most days combined with excessive daytime sleepiness — this pattern suggests significant nocturnal hypoxia. Additionally, act urgently if a bed partner has witnessed you stop breathing or gasp violently during sleep, or if you are experiencing difficulty staying awake while driving. Drowsy driving is a medical emergency: untreated severe OSA confers a 2–7× increased road traffic accident risk. Do not wait. Contact your GP today.
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SmartSleepCalc Editorial Team
Sleep Health Writers · SmartSleepCalc.com
Our editorial team researches and writes sleep health content using primary scientific literature, peer-reviewed journals, and AASM clinical guidelines. All factual claims are cited to named researchers. Content is reviewed on a scheduled basis and updated when new evidence is published.
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Dr. Sarah Mitchell, CCSH
Sleep Medicine Specialist · Medical Reviewer
Dr. Mitchell is a Certified Clinical Sleep Health specialist who reviews SmartSleepCalc content for clinical accuracy. She evaluates all YMYL health claims against current AASM and international sleep medicine guidelines. Last reviewed this page: April 2026.
