CPAP/BiPAP Settings Calculator

Initial pressure settings from diagnosis and patient parameters.

Weight (kg)

Height (cm)

AHI (events/hr)

Neck Circumference (cm)

Mode

Tab to move between fields

Estimated CPAP Pressure (cmH2O)

BMI (kg/m²)31.1

BiPAP IPAP (cmH2O)0

BiPAP EPAP (cmH2O)0

Pressure Support (cmH2O)0

AHI Severity (0=Normal to 3=Severe)2

Titration Range Min (cmH2O)4

Titration Range Max (cmH2O)7

How to Use This Calculator

Enter weight (kg), height (cm), and AHI (events/hr) from your sleep study.
Enter neck circumference (cm) -- a key predictor of OSA severity.
Select therapy mode (CPAP or BiPAP) based on your prescription.
Review estimated starting CPAP pressure or BiPAP IPAP/EPAP settings and calculated BMI.
Note: These are estimates only -- never adjust prescribed pressures without physician guidance.

How the result changes with Height (cm)

Height (cm)	Estimated CPAP Pressure (cmH2O)
130	8
155	6
185	4
210	4

Weight (kg): Patient body weight in kilograms.
Height (cm): Patient height in centimeters.
AHI (events/hr): Apnea-Hypopnea Index from sleep study. Normal < 5, Mild 5-14, Moderate 15-29, Severe ≥ 30.
Neck Circumference (cm): Neck circumference in centimeters. > 43 cm (male) or > 41 cm (female) is a risk factor.
Mode: Select PAP therapy mode.

Estimated CPAP Pressure (cmH2O): Predicted optimal CPAP pressure based on BMI, AHI, and neck circumference.
BMI (kg/m²): Calculated body mass index.
BiPAP IPAP (cmH2O): Inspiratory positive airway pressure (BiPAP mode only).
BiPAP EPAP (cmH2O): Expiratory positive airway pressure (BiPAP mode only).
Pressure Support (cmH2O): IPAP minus EPAP. Typically 4-6 cmH2O for comfort.
AHI Severity (0=Normal to 3=Severe): 0 = Normal (<5), 1 = Mild (5-14), 2 = Moderate (15-29), 3 = Severe (≥30).
Titration Range Min (cmH2O): Lower bound of recommended titration range.
Titration Range Max (cmH2O): Upper bound of recommended titration range.

Identify Input Parameters
4 parameters
Weight (kg) = 90, Height (cm) = 170, AHI (events/hr) = 25, Neck Circumference (cm) = 40 = 5 input(s) provided
Calculate Estimated CPAP Pressure
Estimated CPAP Pressure = (0.16 * bmi) + (0.13 * ahi) + (0.04 * neckCircCm) - 5.12
5 = 5
Calculate BMI
BMI = weightKg / (heightM * heightM)
31.1 = 31.1
Calculate BiPAP IPAP
0 = 0