How to Use the STOP-BANG Calculator to Assess Your Sleep Apnea Risk

By Chloe Tyler · Edited by Adil Sattar·Published Jul 14, 2026·Updated Jul 134, 2026

Medical/educational content — not a diagnostic tool. If you suspect sleep apnea, talk to a doctor or a board-certified sleep specialist.

If you snore loudly, wake up feeling like you never slept, or have been told by a partner that you sometimes stop breathing at night, you've probably searched for a way to check your risk before booking a sleep study. That's exactly what the STOP-BANG calculator is for. It's a free, eight-question screening tool that takes less than two minutes to complete and gives you a score that estimates your likelihood of having obstructive sleep apnea (OSA) — one of the most common, and most commonly undiagnosed, sleep disorders in adults.

This guide explains exactly what the STOP-BANG calculator is, how each question is scored, what your total means, how it compares to other sleep apnea screening tools, and — most importantly — what to do once you have your result. If you haven't already, you can try the STOP-BANG calculator here and follow along with your own score as you read.

What Is the STOP-BANG Calculator?

The STOP-BANG calculator is a digital version of the STOP-BANG questionnaire, a validated clinical screening instrument originally developed by researchers at the University of Toronto and first published in the journal Anesthesiology in 2008. It was designed by Dr. Frances Chung and colleagues to quickly identify surgical patients at high risk of obstructive sleep apnea before anesthesia, since undiagnosed OSA significantly raises the risk of complications during and after surgery. You can read the original 2008 validation study on PubMed if you want to see the underlying research firsthand.

Because it was short, easy to administer, and performed better than longer questionnaires, STOP-BANG was quickly adopted far beyond the operating room. Today it's used in primary care offices, sleep clinics, and — in calculator form — by anyone at home who wants a fast, evidence-based first read on their sleep apnea risk. The American Academy of Sleep Medicine's patient education site covers obstructive sleep apnea in more depth if you want the full clinical picture beyond screening.

The tool works by asking eight yes/no questions. Each "yes" answer adds one point to your total score, which can range from 0 to 8. That score is then sorted into a risk category: low, intermediate, or high risk of obstructive sleep apnea.

It's important to be clear about what this tool is and isn't. STOP-BANG is a screening instrument, not a diagnostic one. It cannot confirm you have sleep apnea, and it can't tell you how severe it is. What it does very well is tell you whether your risk is high enough that a proper diagnostic test — usually a polysomnogram (in-lab sleep study) or a home sleep apnea test — is worth pursuing. For a broader look at how sleep debt and poor sleep quality interact with conditions like this, see our guide on sleep quality tracking at home.

What Does STOP-BANG Stand For?

STOP-BANG is an acronym built from its eight screening questions — four that make up "STOP" and four that make up "BANG." Each letter represents one yes/no question:

1. S — Snoring. Do you snore loudly (louder than talking, or loud enough to be heard through a closed door)?
2. T — Tiredness. Do you often feel tired, fatigued, or sleepy during the daytime, even after what should be enough sleep? (If this sounds familiar, our Why Am I Tired Analyzer can help narrow down other possible causes too.)
3. O — Observed apnea. Has anyone observed you stop breathing, choke, or gasp during your sleep?
4. P — Pressure. Do you have, or are you being treated for, high blood pressure?
5. B — BMI. Is your body mass index (BMI) greater than 35 kg/m²?
6. A — Age. Are you older than 50 years old?
7. N — Neck circumference. Is your neck circumference greater than 40 cm (about 15.75 inches)?
8. G — Gender. Are you male?

Each "yes" is worth one point. A calculator does the same arithmetic a clinician would do by hand, but it also usually flags your intermediate STOP score (the first four items) and your BMI/age/neck/gender score (the last four) separately, since some clinical guidance uses this sub-split for additional context, particularly in surgical risk assessment.

How the STOP-BANG Score Is Calculated

Using a STOP-BANG calculator is straightforward. You'll typically be asked to answer each of the eight questions with a simple yes or no, sometimes after entering your height, weight, and neck circumference so the calculator can compute your BMI and confirm the BMI and neck-circumference thresholds automatically rather than asking you to estimate them yourself. If you don't already know your BMI, our Sleep Quality Score Calculator and other intake tools use the same height/weight inputs, so the numbers are easy to reuse.

Here's the basic math:

• Each "yes" answer = 1 point
• Each "no" answer = 0 points
• Total possible score = 0 to 8 points

Once you've answered all eight questions, the calculator adds up your points and places you into one of three standard risk categories used in the original validation research and in most clinical guidelines since:

Score	Risk Category	What It Suggests
0–2	Low risk	Low probability of moderate-to-severe OSA
3–4	Intermediate risk	Moderate probability of moderate-to-severe OSA
5–8	High risk	High probability of moderate-to-severe OSA

Some clinical protocols refine the high-risk category further, distinguishing a score of 5–6 from a score of 7–8, since research has shown that scores of 7 or 8 correlate with a meaningfully higher likelihood of severe OSA specifically, not just OSA in general. A 2016 review in the journal Chest, STOP-Bang Questionnaire: A Practical Approach to Screen for Obstructive Sleep Apnea, reports that as the score rises from the 0–2 range to the 7–8 range, the probability of moderate-to-severe OSA increases from roughly 18% to 60%, and the probability of severe OSA rises from about 4% to 38%. If your calculator breaks the high-risk band into sub-tiers like this, it's simply reflecting that added nuance from later validation studies.

Step-by-Step: How to Use the STOP-BANG Calculator

Using the tool correctly takes a few minutes and a bit of honesty, especially on the questions that rely on input from a partner or family member.

1. Gather your numbers first. Before you start, know your height and weight (to calculate BMI) and, ideally, your neck circumference in centimeters, measured at the level of the Adam's apple (or the equivalent point for those without a visibly protruding thyroid cartilage).
2. Answer the Snoring question honestly. If you live alone or aren't sure how loud your snoring is, this is worth asking a partner, roommate, or even recording yourself with a phone app for a night.
3. Answer the Tiredness question based on typical days, not your worst day. The question is about a persistent, ongoing pattern of daytime sleepiness or fatigue, not an isolated bad night. Our Sleep Debt Calculator is a useful companion here if you're not sure whether your tiredness is a short-term debt or a longer-running pattern.
4. Answer the Observed apnea question based on what others have told you, not what you assume. Many people with sleep apnea have no memory of the choking or gasping episodes; this question depends on someone else witnessing them.
5. Confirm your blood pressure status. This includes both a formal high blood pressure diagnosis and current use of blood pressure medication, even if your pressure is now well controlled.
6. Let the calculator compute BMI and compare it to the 35 kg/m² threshold rather than guessing.
7. Enter your age and confirm whether you're over 50.
8. Enter your neck circumference, measured snugly but not tightly, at the level just below the larynx.
9. Confirm your sex assigned at birth for the Gender question, since the point is assigned based on male sex specifically, reflecting the higher prevalence of OSA in men found in the original research cohort.
10. Review your total score and risk category, and read the calculator's guidance on next steps.

Interpreting Your STOP-BANG Score

Low risk (0–2 points)

A low score means your answers don't show the classic risk pattern for moderate-to-severe obstructive sleep apnea. This is reassuring, but it isn't a guarantee. STOP-BANG was validated primarily in surgical and general adult populations, and it can under-detect OSA in certain groups — for example, some women with sleep apnea present with different symptoms (insomnia, morning headaches, mood changes) rather than the loud snoring and witnessed apneas the tool weighs heavily. If you scored low but still have strong symptoms like unrefreshing sleep, morning headaches, or a partner who says you sometimes seem to hold your breath, it's still worth mentioning to a doctor — our article on sleep debt and headaches covers some of the overlapping symptoms worth watching for.

Intermediate risk (3–4 points)

A score in this range suggests a moderate probability of OSA. This is a genuine gray zone: some people in this category have significant sleep apnea, and others don't. Clinicians often use additional context here — symptoms, comorbidities like diabetes or heart disease, and sometimes supplementary criteria such as BMI over 35 or female sex combined with other risk factors — to decide whether to escalate straight to testing or to monitor symptoms first.

High risk (5–8 points)

A score of 5 or higher is associated with a substantially increased probability of moderate-to-severe OSA in the validation research, and scores of 7 or 8 are associated with an increased likelihood that any underlying OSA is severe rather than mild. This range is generally the point at which clinical guidelines recommend pursuing formal testing — typically a home sleep apnea test or an in-lab polysomnogram — rather than continuing to monitor symptoms informally.

In every category, the practical message is the same: STOP-BANG estimates probability, not certainty. It's a conversation-starter and a triage tool, not a substitute for a sleep specialist's evaluation.

The Research Behind STOP-BANG

STOP-BANG's popularity isn't just about convenience — it's backed by a substantial body of validation research. The original 2008 study by Chung and colleagues tested the questionnaire against polysomnography (the gold-standard diagnostic sleep study) in surgical patients and found that it performed well at identifying people with moderate-to-severe OSA, with high sensitivity — meaning it was good at correctly flagging people who did have OSA, even if that came at the cost of also flagging some people who didn't (lower specificity).

That sensitivity-over-specificity design is intentional. As a screening tool meant to catch people before anesthesia or before a health problem goes undiagnosed for years, it's considered safer to over-flag some low-risk people for further testing than to miss high-risk people entirely. Subsequent studies across multiple countries and patient populations — including general primary care patients, not just surgical ones — have continued to validate STOP-BANG's performance. A large systematic review and meta-analysis published in PLOS ONE confirmed the tool's validity across sleep clinic, surgical, and general population settings, and it has become one of the most widely used and widely cited OSA screening tools in both clinical practice and sleep research. For a broader dive into how researchers measure sleep itself, see our explainer on sleep cycles and sleep architecture.

Since the original publication, follow-up research has proposed refinements, including combining STOP-BANG scores with objective measures like blood oxygen saturation, and adjusting interpretation for specific populations such as women, older adults, and patients with certain comorbidities, where the standard 8-question, equal-weighting model can be less precise. The National Heart, Lung, and Blood Institute (NHLBI) has more on how sleep apnea is formally diagnosed and treated once a screening tool like this flags a risk.

STOP-BANG vs. Other Sleep Apnea Screening Tools

STOP-BANG isn't the only screening questionnaire in use, and it's worth understanding how it differs from the alternatives you might come across.

Tool	Items	What It Measures	Best For
STOP-BANG	8 yes/no questions	Snoring, tiredness, observed apnea, blood pressure, BMI, age, neck size, sex	Fast, broad OSA risk screening; most widely validated
Epworth Sleepiness Scale (ESS)	8 situational ratings (0–3 each)	Subjective likelihood of dozing off in daily situations	Measuring daytime sleepiness generally, not OSA-specific
Berlin Questionnaire	10 items across 3 categories	Snoring behavior, daytime sleepiness, obesity/hypertension history	Older, more detailed alternative to STOP-BANG
STOP (without BANG)	4 yes/no questions	Snoring, tiredness, observed apnea, blood pressure only	Very quick screen, lower accuracy than full STOP-BANG
NoSAS Score	5 factors	Neck size, obesity, snoring, age, sex	General population screening; newer, less studied in surgical settings

Epworth Sleepiness Scale (ESS). The ESS asks you to rate your likelihood of dozing off in eight everyday situations (like watching TV or sitting in traffic) on a 0–3 scale, producing a total from 0 to 24. Unlike STOP-BANG, the ESS measures subjective daytime sleepiness alone — it doesn't account for anatomical risk factors like neck size or BMI, and it isn't specific to sleep apnea; excessive sleepiness has many causes. It's often used alongside STOP-BANG rather than instead of it, and pairs well with our own Sleep Debt Calculator if daytime sleepiness is your main concern.

Berlin Questionnaire. This is an older, longer tool that was one of the first widely used OSA screening instruments. Research comparing it to STOP-BANG has generally found STOP-BANG to be simpler to administer and at least as accurate, if not more so, which is part of why STOP-BANG has largely overtaken it in clinical use.

STOP questionnaire (without BANG). This is simply the first four STOP-BANG questions — Snoring, Tiredness, Observed apnea, Pressure — used on its own. It's faster but less accurate than the full eight-item STOP-BANG, since it excludes the anatomical and demographic risk factors (BMI, age, neck size, gender) that meaningfully improve the tool's predictive power.

NoSAS score. A newer, five-factor screening tool (neck circumference, obesity, snoring, age, sex) that some research suggests performs comparably to STOP-BANG in general population screening, though it hasn't been studied as extensively in surgical populations.

In practice, STOP-BANG remains the most widely adopted option because it balances brevity with strong predictive performance across a wide range of studied populations.

Who Should Take the STOP-BANG Test?

STOP-BANG is useful for a broad range of people, but it's especially worth taking if any of the following apply to you:

1. You or your partner have noticed loud, frequent snoring
2. You wake up gasping, choking, or with a dry mouth
3. You feel excessively tired during the day despite spending enough time in bed
4. You have high blood pressure that's difficult to control
5. You have a BMI over 30, and especially over 35
6. You're over 50 and have any of the above symptoms
7. You have a thick or large neck circumference
8. You've been told you stop breathing during sleep
9. You have risk factors for cardiovascular disease, type 2 diabetes, or have had a stroke, all of which are more common in people with untreated OSA
10. You're scheduled for surgery and haven't been screened for OSA, since undiagnosed sleep apnea raises anesthesia-related risk

It's also reasonable to take the test simply out of general curiosity about your sleep health, even without obvious symptoms — some people with sleep apnea, particularly women and people with lower BMI, don't fit the "classic" profile and only find out they're at risk after taking a screening questionnaire. If general sleep quality (rather than apnea specifically) is more your concern, our Sleep Efficiency Calculator and Circadian Rhythm Calculator are good complementary starting points.

Limitations of the STOP-BANG Calculator

No screening tool is perfect, and it's worth understanding where STOP-BANG's blind spots are.

• It can flag false positives. Because the tool favors sensitivity, a meaningful number of people who score as "high risk" will turn out not to have moderate-to-severe OSA on formal testing. A high score means "get tested," not "you have sleep apnea."
• It can miss cases in some populations. The original validation cohort skewed toward surgical patients, and research since then has shown the tool can underperform in women, in people with a lower BMI, and in older adults whose symptom patterns don't fit the tool's core questions as neatly.
• It relies on subjective and sometimes third-party information. The Observed apnea and Snoring questions depend on someone else witnessing your sleep, which isn't available to everyone, particularly people who live and sleep alone.
• It doesn't measure severity. A score of 8 doesn't tell you whether you have mild, moderate, or severe OSA — only that the probability of having a clinically significant form of it is elevated.
• It isn't a substitute for a sleep study. Polysomnography or a validated home sleep apnea test remains the only way to actually diagnose obstructive sleep apnea and determine its severity via the apnea-hypopnea index (AHI). The NHLBI's guide to sleep apnea causes is a good next read if you want to understand what a formal diagnosis actually evaluates.

What to Do After Getting Your Score

Your next step depends on your result, but in every case, the goal is the same: turn a screening result into an informed conversation with a healthcare provider.

Your Score	Risk Level	Recommended Next Step
0–2	Low	Monitor symptoms; retake if new symptoms appear
3–4	Intermediate	Discuss with your primary care doctor at your next visit
5–6	High	Talk to your doctor about a sleep study soon
7–8	Very high	Prioritize a referral to a sleep specialist or formal sleep study

If you scored low (0–2): Keep an eye on your symptoms over time, since risk factors like weight, age, and blood pressure can change. If new symptoms appear — new snoring, new daytime sleepiness, or a partner noticing breathing pauses — it's worth retaking the questionnaire. Tracking overall trends with our Weekly Sleep Planner can help you notice changes early.

If you scored intermediate (3–4): Bring your result to a primary care visit. Your doctor may ask more detailed questions, examine your airway, or refer you directly for a sleep study depending on your broader health picture.

If you scored high (5–8): This is generally the point where a referral to a sleep medicine specialist or a formal sleep study is appropriate. Don't be alarmed by a high score — remember it reflects probability, not diagnosis — but do treat it as a reason to follow up rather than ignore. The AASM's obstructive sleep apnea patient guide walks through what a sleep study and treatment process typically look like.

In all cases: Mention any relevant health conditions (high blood pressure, diabetes, heart disease, prior stroke) to your doctor, since these interact meaningfully with sleep apnea risk and treatment decisions. If you're being evaluated before a scheduled surgery, let your surgical team know your score as early as possible, since it can affect anesthesia planning. You can also review the NHLBI's overview of sleep apnea treatment options to understand what comes after a diagnosis.

Frequently Asked Questions

Is the STOP-BANG calculator accurate? It's one of the most validated OSA screening tools available, with strong sensitivity for detecting moderate-to-severe sleep apnea in the populations it's been studied in. But like all screening tools, it isn't diagnostic — a high score means further testing is warranted, not that OSA is confirmed.

Can I use STOP-BANG if I'm a woman? Yes, and it's still useful, but be aware that research suggests the tool can be somewhat less sensitive in women, partly because the Gender question assigns a point specifically for male sex, and partly because women's OSA symptoms sometimes differ from the "classic" pattern the tool was built around. A low score in a woman with strong symptoms is still worth discussing with a doctor.

What's a "bad" STOP-BANG score? There's no single "bad" score, but 5 or higher is generally treated as high risk, and 7 or 8 is associated with a higher chance that any underlying OSA is severe.

Does a high STOP-BANG score mean I need a CPAP machine? No. A high score means you should get tested. CPAP (continuous positive airway pressure) and other treatments are only prescribed after a formal diagnosis confirms OSA and characterizes its severity.

How is STOP-BANG different from a home sleep apnea test? STOP-BANG is a questionnaire that estimates your risk based on symptoms and characteristics. A home sleep apnea test is an actual diagnostic device you wear overnight that measures things like airflow, oxygen levels, and breathing effort to calculate your AHI and confirm a diagnosis.

Can children use the STOP-BANG calculator? No. STOP-BANG was developed and validated for adults. Pediatric sleep apnea screening uses different tools and criteria, and should be evaluated by a pediatrician or pediatric sleep specialist. Our Baby Sleep Calculator is built for general infant sleep needs, not apnea screening.

How often should I retake the STOP-BANG questionnaire? There's no fixed schedule, but it's reasonable to retake it if your weight changes significantly, if you develop new high blood pressure, if a partner notices new snoring or breathing pauses, or simply once a year as a general check-in, especially after age 50.

Final Thoughts

The STOP-BANG calculator earns its popularity honestly: it's fast, free, backed by real clinical validation research, and genuinely useful for deciding whether your sleep symptoms are worth a closer look. Eight yes-or-no questions won't replace a sleep study, and they're not meant to — but they're an evidence-based first step that can turn a vague worry about your sleep into a concrete, actionable next move. If your score comes back intermediate or high, treat it as useful information to bring to a doctor, not a verdict to sit with on your own.

If you want to keep exploring your broader sleep health, try our Sleep Debt Calculator, Insomnia Severity Index Test, or read more in The Sleep Library.

This article is for informational purposes only and does not constitute medical advice. "Sleep age" is an educational concept derived from population-level research and is not a validated diagnostic measurement. Consult a qualified healthcare provider for concerns about sleep disorders or aging-related health.