Skip to content
Free Sleep Apnea Screener

Sleep Apnea Risk Test

Take the validated STOP-BANG questionnaire used by sleep clinics worldwide. 8 yes/no questions. Your score in 60 seconds. No email, nothing saved.

This is a screening tool, not a diagnostic device. Snollo does not diagnose or treat any medical condition. If your score is concerning, speak with a doctor — a formal diagnosis requires a sleep study.

STOP-BANG Calculator

S Do you snore loudly — loud enough to be heard through closed doors, or does your bed partner elbow you in the night?
T Do you often feel tired, fatigued, or sleepy during the daytime, even after a full night in bed?
O Has anyone observed you stop breathing, choke, or gasp during your sleep?
P Do you have, or are you being treated for, high blood pressure?
B Is your body mass index more than 35 kg/m²?
A Are you older than 50?
N Is your neck circumference greater than 17 inches (43 cm) for men, or 16 inches (41 cm) for women?
G Are you male?
Your STOP-BANG score 0 / 8

Screening tool only — not a diagnosis. A formal sleep apnea diagnosis requires a sleep study ordered by a doctor. Source: Chung et al., CHEST Journal.

What your STOP-BANG score means

STOP-BANG was originally developed for preoperative clinics — anesthesiologists needed a fast, reliable way to flag surgical patients at elevated risk. It has since been validated across the general population, sleep clinics, and commercial drivers in dozens of studies.

Score Risk level What it means
0–2 Low Essentially rules out moderate-to-severe OSA with high confidence.
3–4 Intermediate Worth investigating. Collect a few nights of home data before booking a sleep study.
5–8 High ~80% specificity for OSA. Book a doctor visit and ask about a sleep study.

How accurate is the STOP-BANG questionnaire?

At a cutoff score of 3 or higher, the original validation study reported the following sensitivity rates against lab-confirmed cases. These have been replicated across multiple meta-analyses spanning thousands of patients (Hwang et al., 2021).

84% sensitivity for any obstructive sleep apnea (AHI ≥5)
93% sensitivity for moderate-to-severe sleep apnea (AHI ≥15)
100% sensitivity for severe sleep apnea (AHI ≥30)

How the STOP-BANG questionnaire works

STOP-BANG is an acronym for the eight items it measures — four self-reported symptoms and four demographic risk factors. Each "yes" scores one point. The questionnaire was developed by Dr. Frances Chung at the University of Toronto, first published in 2008, and is now used in over 30 countries.

STOP — symptoms

  • Snoring
  • Tiredness during the day
  • Observed apnea
  • Pressure (high blood pressure)

BANG — risk factors

  • BMI over 35 kg/m²
  • Age over 50
  • Neck circumference (43 cm / 41 cm)
  • Gender (male)

The next step: collect your own sleep data

If you scored in the intermediate or high-risk range, the most useful thing before booking a sleep study is to collect a few nights of real data from your own bed. Snollo classifies nighttime sound events on your iPhone and stores results in your own iCloud, under your Apple ID — no separate Snollo account.

Download Snollo — Free Read the full guide →

Frequently asked questions

Is the STOP-BANG questionnaire reliable?
Yes. STOP-BANG is one of the most widely validated sleep apnea screening tools in the world. At a cutoff score of 3 or higher, it has demonstrated 84% sensitivity for any obstructive sleep apnea, 93% sensitivity for moderate-to-severe sleep apnea, and 100% sensitivity for severe sleep apnea, based on the original validation study published in CHEST Journal.
Does this test diagnose sleep apnea?
No. STOP-BANG is a screening tool, not a diagnostic one. A formal diagnosis of obstructive sleep apnea requires a sleep study — either an in-lab study or a home sleep apnea test (HSAT) ordered by a doctor. A high STOP-BANG score means you should be tested, not that you have the condition.
What does my STOP-BANG score mean?
Scores of 0–2 indicate low risk and essentially rule out moderate-to-severe sleep apnea with high confidence. Scores of 3–4 indicate intermediate risk and warrant further investigation. Scores of 5–8 indicate high risk — at this level, the questionnaire is approximately 80% specific for sleep apnea, and a doctor visit is the recommended next step.
Is my data saved or sent anywhere?
No. This calculator runs entirely in your browser. Your answers are never sent to a server, never written to disk, and never tracked. There's no email field and no analytics on your responses. If you reload the page, everything is gone.
Can I take this test if I'm a woman or under 50?
Yes, but interpret a low score with caution. The original STOP-BANG validation was weighted toward populations where sleep apnea is most common — older men with elevated BMI. Women and younger adults can absolutely have sleep apnea, and their symptoms often present as fatigue, insomnia, or depression rather than loud snoring. If you scored low but have witnessed apneas, morning headaches, or persistent unexplained fatigue, talk to a doctor anyway.
How accurate is this compared to a sleep study?
A sleep study is the gold standard and produces a real apnea-hypopnea index (AHI) — the actual count of breathing pauses per hour. STOP-BANG is a screening questionnaire that estimates whether you're in the risk group for moderate-to-severe sleep apnea. It's accurate enough to be used by anesthesiologists worldwide to flag surgical patients, but it cannot replace a formal sleep study for diagnosis.
What should I do after getting my score?
If your score is 0–2: relax, and look elsewhere if you're still tired. If your score is 3–4: collect a few nights of your own sleep data (sound events, sleep stages) before deciding whether to book a sleep study. If your score is 5 or higher: book a doctor visit, ask about a sleep study, and consider bringing any home data you've collected with you to make the appointment more useful.

Sources

From the Snollo blog

Guide

How to Know If You Have Sleep Apnea Without a Sleep Study

Screen yourself for obstructive sleep apnea at home — using a validated 8-question tool, your own nighttime data, and the warning signs doctors check.

Guide

Why You're Still Tired After 8 Hours of Sleep (And How to See What's Actually Happening Tonight)

Eight hours in bed isn't restorative sleep. Seven evidence-based reasons you wake up exhausted — and how to collect your own sleep data tonight.

Guide

Does Apple Watch Track Snoring? (And How to Fix It)

Apple Watch doesn't record snoring — it tracks motion, heart rate, and breathing. What it measures, what it can't, and how to add snore detection.