power test
USB Voltage Current to Watts Calculator
Convert volts and amps into electrical power for a documented charger/profile.
No accountLocal where possibleRetest anytime
USB power
Convert volts and amps into electrical power for a documented charger/profile.
This is a planning/compatibility calculation from the values you enter. DeviceOK does not claim to read charger protocols, battery health, cable electronics or mount certification from your browser.
Private by design
Calculated locally.
Use the result as evidence, not a guess.
This test checks
- Volts × amps
- Entered power profile
How to read it
Use the negotiated/documented profile, not the charger's biggest printed number alone.