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STOP-BANG Calculator

Assess your risk of obstructive sleep apnea (OSA) using the validated 8-question STOP-BANG clinical screening model.

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Input Parameters

Enter details for calculation.

S: Do you snore loudly?

T: Do you often feel tired/sleepy during the day?

O: Has anyone observed you stop breathing during sleep?

P: Do you have or are you being treated for high blood pressure?

B: Is your BMI more than 35 kg/m²?

A: Are you older than 50 years?

N: Is your neck circumference larger than 16 inches (40cm)?

G: Is your biological sex male?

STOP-BANG Score

3 / 8

Intermediate Risk

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Expert Tip

STOP-BANG Score: 0–2 = Low Risk, 3–4 = Intermediate Risk, 5–8 = High Risk for Obstructive Sleep Apnea.

Calculation Methodology & Details

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Formula

Score = Sum of 8 positive factors (0 or 1 each)

The STOP-BANG questionnaire is widely used by anesthesiologists and sleep physicians to screen for sleep apnea.

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Important Disclaimer

The calculations provided are for educational and general informational purposes only. They do not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider.

How STOP-BANG is Calculated

Follow these steps to use this calculator:

Answer STOP Questions

Log symptoms: snoring, tiredness, observed apneas, blood pressure.

Answer BANG Questions

Log demographics: BMI, age, neck size, gender.

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ℹ️ About this Calculation

This sleep medicine calculator evaluates sleep architecture, circadian rhythm alignment, daytime sleepiness risk scores, and sleep apnea severity (AHI / STOP-BANG) based on clinical somnology protocols.

Variable Glossary

Input

Sleep Data & Symptoms

Bedtime, wake time, total sleep duration, nocturnal awakenings, or questionnaire symptom scores.

Parameter

Sleep Metrics

Sleep efficiency percentage, AHI severity tier, REM cycle counts, or sleep debt accumulation.

How to Calculate Step-by-Step

Step 1

Input your sleep times, duration, or answer the clinical assessment questions.

Step 2

Adjust target sleep goals or age-appropriate sleep recommendations.

Step 3

View optimal wake/sleep times, cycle counts, or clinical sleep disorder screening risk.

FAQ

Why is the 90-minute sleep cycle rule important?

Human sleep typically progresses through 90-minute cycles consisting of NREM and REM stages. Waking up at the completion of a full cycle reduces grogginess (sleep inertia).

What AHI score indicates obstructive sleep apnea?

An Apnea-Hypopnea Index (AHI) under 5 is normal. Scores of 5-14 indicate mild OSA, 15-29 moderate OSA, and 30+ severe sleep apnea.

Can screening calculators replace a polysomnogram (PSG)?

No. Tools like STOP-BANG and ESS are preliminary screening questionnaires. Definitive diagnosis requires overnight sleep study monitoring (polysomnography) supervised by a sleep physician.