Free CPAP tools and calculators

Work out battery runtime for camping or a power cut, check a battery against airline rules, see whether you are on track for insurance compliance, and more. Every tool shows its formula and a worked example.

CPAP mask finderEight questions to the mask types most likely to suit you. Supply replacement remindersA free email when each part reaches its replacement date. CPAP Cash vs Insurance Cost CalculatorCompare buying a CPAP with cash against a 13-month insurance rental.CPAP Machine Replacement TimelineSee how long until your CPAP reaches Medicare's 5-year reasonable useful lifetime.CPAP Supply Replacement Cost per YearAdd up a year of cushions, filters, tubing, masks and water chambers.Medicare CPAP Compliance CalculatorCheck whether your nights of 4+ hours meet Medicare's 70% rule in a 30-day window.CPAP Battery Runtime CalculatorEstimate how many hours and nights a battery will run your CPAP, with or without the humidifier.CPAP Power Station and Solar Sizing for CampingSize a power station for a camping trip and check whether a solar panel can keep up.FAA CPAP Battery Watt-Hour CheckConvert a battery's mAh and voltage to watt-hours and see which FAA category it falls in.STOP-Bang Sleep Apnea Screening ScoreScore the 8-question STOP-Bang screening questionnaire for obstructive sleep apnea risk.CPAP Distilled Water Usage CalculatorWork out how much distilled water your humidifier uses a month and how many jugs to buy.AHI CalculatorWork out your apnea-hypopnea index from event counts and hours.CPAP Pressure Unit ConverterConvert cm H2O to hPa, mbar, kPa and psi.Sleep Apnea Severity from AHITurn an AHI number into the standard adult severity band.Weekly CPAP Usage AverageAverage your nightly CPAP hours over a week and count nights of 4 hours or more.