CPAP Battery Runtime Calculator

Answer three questions and we'll estimate how many nights a battery or power station will run your CPAP — plus which units actually fit that need. Estimates are based on typical CPAP power draw; your exact numbers vary by machine and settings.

Your CPAP pressure

Heated humidifier

Connection

Battery capacity (Wh)

–nights

– hours of runtime

Estimated draw: –

Power stations we recommend for CPAP

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How the math works

Runtime ≈ (battery Wh × efficiency) ÷ CPAP watts. Going through an AC inverter loses about 15%; a DC-direct cable keeps ~98%. The single biggest factor is the heated humidifier, which can triple your machine's draw. For the full breakdown see How Long Will a Power Station Run a CPAP? and our complete CPAP power guide.