Sleep Apnea Risk Calculator
Free sleep apnea risk calculator using the validated STOP-BANG questionnaire: screen obstructive sleep apnea (OSA) risk from snoring, daytime sleepiness, BMI, neck size, age, blood pressure, and more—with sleep study recommendation.
Enter your details — results appear below after you calculate.
Basic information
Measure at Adam's apple level. STOP-BANG threshold: > 40 cm for men.
STOP-BANG screening
Answer each STOP-BANG question honestly. This validated 8-item questionnaire is used worldwide to screen for obstructive sleep apnea before sleep testing.
B (BMI > 35), A (Age > 50), N (Neck size), and G (Male sex) are calculated automatically from your entries above.
Additional OSA symptoms
Select any additional symptoms you experience. These do not change your STOP-BANG score but help contextualize your results.
How this sleep apnea risk calculator works
Enter your age, gender, height, weight, and neck circumference in metric (kg, cm) or imperial (lb, ft/in)—then answer the four STOP-BANG questions (snoring, tiredness, observed pauses, blood pressure). The tool converts imperial inputs automatically and auto-calculates BMI, age, neck size, and gender criteria for your STOP-BANG score (0–8).
0–2 suggests low OSA risk, 3–4 intermediate (discuss screening with your doctor), and 5–8 high (sleep study strongly recommended). Six optional additional symptoms (gasping, morning headaches, dry mouth, nocturia, concentration problems, irritability) help contextualize results but do not change the STOP-BANG score.
Logic: One point per positive STOP-BANG criterion. BMI > 35, age > 50, neck > 40 cm (men) or > 35 cm (women), and male sex are derived from your measurements. A score ≥ 3 triggers a sleep study recommendation.
Pair with our Sleep Efficiency, Sleep Debt, and BMI Calculator for related checks. Results are educational screening—not a sleep apnea diagnosis.
Sleep Apnea Risk Calculator – STOP-BANG Screening, OSA Symptoms & Sleep Study Guide
Millions search "sleep apnea risk calculator", "STOP-BANG score", "do I have sleep apnea", and "snoring sleep study" each year—yet obstructive sleep apnea (OSA) remains undiagnosed in an estimated 80–90% of affected adults. OSA causes repeated breathing pauses during sleep, fragmenting rest and raising risks of hypertension, heart disease, stroke, diabetes, and drowsy-driving accidents. Our free Sleep Apnea Risk Calculator applies the validated STOP-BANG questionnaire (Snoring, Tired, Observed apnea, Pressure, BMI, Age, Neck, Gender) plus optional additional symptom tracking to estimate your screening risk level (Low, Intermediate, High) and recommend whether to discuss a sleep study with your doctor.
Pair results with our Sleep Efficiency Calculator, Sleep Debt Calculator, BMI Calculator, and Blood Pressure Risk Calculator for a complete picture of how sleep, weight, and cardiovascular health interact.
What Is Obstructive Sleep Apnea?
Obstructive sleep apnea occurs when throat muscles and soft tissues relax excessively during sleep, blocking airflow. The brain briefly rouses you to reopen the airway—often without full awareness—causing dozens or hundreds of micro-awakenings per night. Classic signs include loud snoring, witnessed breathing pauses, gasping, unrefreshing sleep, and excessive daytime sleepiness. Risk rises with obesity, thick neck circumference, male sex, age over 50, and hypertension.
In India, growing obesity rates and limited routine sleep screening contribute to high undiagnosed OSA burden. CPAP therapy—the gold standard treatment—restores oxygen levels and sleep quality for most patients. This calculator helps you decide whether to request evaluation; it does not replace medical diagnosis.
1What You Enter
Demographics & measurements
- Units — Metric (kg, cm) or Imperial (lb, ft/in)
- Age — 18–100 years
- Gender — Male or Female
- Height — cm, or feet + inches
- Weight — kg or lb (auto-converted for BMI)
- Neck circumference — cm or inches (measured at Adam's apple level)
STOP-BANG questions (Yes / No)
- S — Snoring loudly
- T — Tired / sleepy during daytime
- O — Observed breathing pauses
- P — High blood pressure or on treatment
Auto-calculated STOP-BANG criteria
- B — BMI > 35
- A — Age > 50
- N — Neck > 40 cm (men) or > 35 cm (women)
- G — Male sex
Additional symptoms (optional)
- Gasping or choking awakenings
- Morning headaches
- Dry mouth on waking
- Frequent nighttime urination
- Difficulty concentrating
- Irritability or mood changes
Example (intermediate risk — man, 48)
Male, age 48, BMI 31, neck 42 cm, snoring yes, tired yes, no observed pauses, no hypertension → STOP-BANG 4/8, Intermediate risk, home sleep test discussion recommended.
Example (high risk — obese with hypertension)
Male, age 55, BMI 38, neck 44 cm, snoring yes, tired yes, observed pauses yes, hypertension yes → STOP-BANG 8/8, High risk, urgent polysomnography recommended.
2STOP-BANG Scoring Logic
One point per positive criterion (max 8)
Each STOP-BANG item contributes 1 point when positive. BMI, age, neck size, and gender are derived from your measurements and demographics.
Risk interpretation
Low risk: 0–2 points — OSA unlikely but not ruled out. Intermediate risk: 3–4 points — discuss sleep apnea screening with your doctor. High risk: 5–8 points — OSA likely; sleep study strongly recommended.
Sleep study recommendation
A STOP-BANG score of 3 or higher triggers a sleep study recommendation. Polysomnography (in-lab overnight study) is the diagnostic gold standard; home sleep apnea tests (HSAT) are appropriate for many uncomplicated cases.
3What You Get in Your Report
- STOP-BANG score (0–8) and risk level — Low, Intermediate, or High
- Full STOP-BANG breakdown — each letter (S-T-O-P-B-A-N-G) with points and clinical explanation
- BMI calculated from your height and weight
- Additional symptoms flagged — recap of optional OSA symptoms selected
- Sleep study recommendation — triggered at score ≥ 3
- Personalized interpretation, insights, and next steps
- Disclaimer: Screening tool only — not a diagnosis
- PDF export & share for doctor or sleep specialist visits
4How We Calculate Your Results
- Calculate BMI from height (cm) and weight (kg)
- Award 1 STOP-BANG point for each positive questionnaire answer (S, T, O, P)
- Auto-score B if BMI > 35, A if age > 50, N if neck exceeds gender threshold, G if male
- Sum total STOP-BANG score (maximum 8 points)
- Assign risk level: 0–2 Low, 3–4 Intermediate, 5–8 High
- Flag sleep study recommended when score ≥ 3
- Generate interpretation, insights, next steps, and optional symptom recap
5Health Risks of Untreated OSA
- Cardiovascular: Resistant hypertension, atrial fibrillation, coronary artery disease, heart failure, stroke, pulmonary hypertension
- Metabolic: Insulin resistance, type 2 diabetes, metabolic syndrome, non-alcoholic fatty liver disease
- Neurocognitive: Daytime sleepiness, impaired concentration, memory problems, depression, 2–7× higher motor vehicle accident risk
- Quality of life: Partner sleep disruption from snoring, reduced work productivity, chronic fatigue, relationship strain
6Treatment Options After Diagnosis
- CPAP therapy: Continuous positive airway pressure — first-line for moderate-to-severe OSA (AHI ≥ 15)
- Auto-CPAP / BiPAP: Variable pressure devices for comfort or complex cases
- Oral appliances: Mandibular advancement devices for mild-to-moderate OSA or CPAP intolerance
- Lifestyle: Weight loss (5–10% can cut AHI 20–50%), side-sleeping, avoiding alcohol and sedatives before bed
- Positional therapy: Devices that prevent supine sleeping when OSA is position-dependent
- Surgery: UPPP, maxillomandibular advancement, or hypoglossal nerve stimulation for selected anatomy
STOP-BANG Criteria — Full Reference Table
| Letter | Criterion | How scored in this calculator |
|---|---|---|
| S | Snoring loudly (heard through closed doors) | Yes / No — you answer directly |
| T | Tired, fatigued, or sleepy during daytime | Yes / No — you answer directly |
| O | Observed apneas (breathing pauses during sleep) | Yes / No — bed partner observation |
| P | High blood pressure or on treatment | Yes / No — you answer directly |
| B | BMI > 35 kg/m² | Auto-calculated from height & weight |
| A | Age > 50 years | Auto-calculated from your age |
| N | Large neck circumference | Auto: > 40 cm (men) or > 35 cm (women) |
| G | Gender — male | Auto: 1 point if male |
OSA Severity — AHI Classification
Sleep studies measure the Apnea-Hypopnea Index (AHI)— breathing pauses plus shallow-breathing events per hour of sleep. This calculator screens risk; only a sleep study confirms severity:
| Severity | AHI (events/hour) | Typical approach |
|---|---|---|
| Normal | < 5 | No treatment; address symptoms if present |
| Mild | 5–14 | Lifestyle, positional therapy, or oral appliance |
| Moderate | 15–29 | CPAP usually recommended |
| Severe | ≥ 30 | CPAP strongly recommended; urgent evaluation |
Sleep Apnea in India — Key Statistics & Context
- Prevalence: OSA affects an estimated 5–10% of Indian adults; rates rise sharply with obesity and urban lifestyles
- Underdiagnosis: Up to 80–90% of cases remain undiagnosed—snoring is often dismissed as normal
- Obesity link: India's rising obesity epidemic (BMI > 25 in ~25% of urban adults) drives increasing OSA burden
- Hypertension overlap: ~50% of OSA patients have hypertension; treating OSA can improve blood pressure control
- Access: Sleep labs expanding in metros; home sleep tests now available in Delhi, Mumbai, Bangalore, Chennai, Hyderabad, and other cities (₹3,000–15,000)
- Occupational risk: Truck drivers, shift workers, and pilots with untreated OSA face elevated accident risk—screening is increasingly mandated in transport sectors
Major OSA Risk Factors
Modifiable factors
- Obesity and excess neck fat (BMI > 25)
- Alcohol consumption before bedtime
- Sedative and sleeping pill use
- Smoking (airway inflammation)
- Supine (back) sleeping position
- Poor sleep hygiene and irregular schedules
Non-modifiable factors
- Male sex (2–3× higher prevalence)
- Age over 50 (tissue laxity increases)
- Family history of OSA or snoring
- Craniofacial anatomy (recessed jaw, large tongue)
- Enlarged tonsils or adenoids
- Postmenopausal status in women
OSA vs Central Sleep Apnea — Key Differences
| Feature | Obstructive (OSA) | Central (CSA) |
|---|---|---|
| Mechanism | Airway collapse | Brain fails to signal breathing |
| Snoring | Usually loud | Often absent |
| Common causes | Obesity, neck size, anatomy | Heart failure, opioids, stroke |
| Screening tool | STOP-BANG (this calculator) | Different evaluation needed |
| Treatment | CPAP, weight loss, surgery | Treat underlying cause, adaptive servo-ventilation |
This calculator screens for obstructive sleep apnea only. If you have heart failure, use opioids, or lack snoring despite pauses, discuss central sleep apnea with a sleep specialist.
Types of Sleep Studies Explained
Polysomnography (in-lab PSG)
Gold-standard overnight study in a sleep lab. Monitors brain waves (EEG), eye movement, chin muscle tone, heart rate, oxygen saturation, airflow, chest/abdominal effort, and leg movements. Diagnoses OSA, central apnea, periodic limb movements, and sleep architecture disorders. Best for complex cases, suspected central apnea, or when home test is inconclusive.
Home Sleep Apnea Test (HSAT / Type 3)
Portable device worn at home measuring airflow, breathing effort, oxygen, and heart rate. Appropriate for adults with high OSA probability (e.g., STOP-BANG ≥ 3) without major comorbidities. More convenient and lower cost (₹3,000–8,000 in India). May underestimate severity vs in-lab PSG.
CPAP Titration Study
After OSA diagnosis, a split-night or dedicated titration study determines optimal CPAP pressure. Some modern auto-CPAP devices adjust pressure automatically at home, reducing the need for in-lab titration in straightforward cases.
Lifestyle Tips to Reduce OSA Risk
- Weight management: Even 5–10% body weight loss reduces AHI significantly in overweight patients
- Sleep position: Side-sleeping reduces airway collapse vs supine (back) sleeping—try a positional pillow or tennis-ball technique
- Avoid alcohol & sedatives: Within 3–4 hours of bedtime—they relax airway muscles and worsen apneas
- Quit smoking: Reduces upper airway inflammation and mucus production
- Regular sleep schedule: Consistent bed/wake times support sleep quality—use our Sleep Cycle Calculator for timing
- Nasal congestion: Treat allergies and deviated septum—nasal obstruction worsens mouth breathing and snoring
- Exercise: Regular aerobic activity improves sleep quality and aids weight management, indirectly lowering OSA severity
Example Screening Scenarios
Low risk — young woman, BMI 24
Female, age 32, BMI 24, neck 32 cm, no snoring, no daytime sleepiness, no hypertension → STOP-BANG 0/8, Low risk. Monitor symptoms; re-screen if snoring or fatigue develops.
Intermediate — middle-aged man, overweight
Male, age 48, BMI 31, neck 42 cm, snoring yes, tired yes, no observed pauses, no hypertension → STOP-BANG 4/8 (S+T+N+G), Intermediate risk. Discuss home sleep test with doctor.
High risk — obese man with hypertension
Male, age 55, BMI 38, neck 44 cm, snoring yes, tired yes, observed pauses yes, hypertension yes → STOP-BANG 8/8, High risk. Urgent sleep study and CPAP evaluation recommended.
Intermediate — postmenopausal woman
Female, age 58, BMI 29, neck 36 cm, snoring yes, tired yes, morning headaches, no observed pauses → STOP-BANG 3/8 (S+T+A+N), Intermediate. Sleep study warranted despite female sex.
CPAP Therapy — What to Expect
If your sleep study confirms moderate-to-severe OSA, CPAP is usually prescribed. Here is what new users should know:
- Mask fitting: Nasal, nasal-pillow, or full-face masks are available—proper fit prevents leaks and improves compliance
- Adaptation period: Most users need 1–4 weeks to adjust; start with 2–4 hours/night and build up
- Humidifier: Heated humidification prevents dry nose and throat—essential in air-conditioned Indian homes
- Compliance target: Use ≥ 4 hours/night on ≥ 70% of nights for insurance and clinical benefit
- Results: Daytime sleepiness often resolves within days; blood pressure and glucose may improve over weeks to months
- Cost in India: CPAP machines range ₹25,000–80,000; many hospitals offer rental programs during trial periods
When to See a Doctor for Sleep Apnea
- STOP-BANG score of 3 or higher on this calculator
- Loud snoring with witnessed breathing pauses or gasping
- Excessive daytime sleepiness affecting work or driving
- Morning headaches with unrefreshing sleep
- Resistant hypertension despite medication
- Partner reports your snoring stops abruptly then resumes loudly
- Obesity (BMI > 30) with any sleep-related symptoms
- Preparing for surgery—undiagnosed OSA increases anaesthesia risk
When to Seek Urgent Medical Care
- Falling asleep while driving or operating machinery
- Severe chest pain or stroke symptoms upon waking
- Witnessed prolonged breathing pauses with cyanosis (bluish lips)
- Severe morning headaches with vomiting or vision changes
- New or worsening heart failure symptoms (leg swelling, breathlessness)
Frequently Asked Questions (FAQs)
Related Calculators
You might also be interested in these related health and wellness calculators:
Stress Load Calculator
Estimate your daily stress load based on your sleep, work hours, and self-reported stress. A higher stress index suggests a greater need for rest and recovery.
Sleep Debt Calculator
Estimate your sleep debt by comparing your actual sleep duration with your recommended sleep needs. Understand how accumulated sleep loss may affect energy, mood, and long-term health.
Fatty Liver Risk Calculator
Assess NAFLD/MASLD fatty liver risk from BMI, waist, diabetes, diet, alcohol and lifestyle. Get weight-loss targets, diet tips, exercise guidance, and liver test recommendations.
Sleep Cycle Calculator
Find the best bedtime or wake-up time using 90-minute sleep cycles. Wake between cycles instead of during deep sleep for clearer mornings.
Sleep Efficiency Calculator
Calculate your sleep efficiency percentage from time in bed and total sleep time. See how well you consolidate sleep and get tips to reduce night-time wakefulness.
Cardiovascular Risk Calculator
Estimate heart disease and stroke screening risk from blood pressure, cholesterol, smoking, diabetes, family history, and activity. Educational score with risk domains—not formal ASCVD.
Body Mass Index (BMI) Calculator
Calculate your Body Mass Index (BMI) from height and weight in metric or imperial units. Get WHO categories, healthy weight range, BMI Prime, and PDF export.
Blood Pressure Interpreter & Risk Calculator
Interpret blood pressure with AHA/ACC 2017 categories, color-coded gauge, overall health risk (Low/Moderate/High/Urgent), lifestyle recommendations, and emergency alert for crisis readings.