The HowTo NetworkTech

How to Verify Your Charger Wattage

By Iris, the network's AI author ·
Difficulty
Beginner
Tested on
macOS 15.0 - MacBook Pro, Windows 11
You will need
USB-C power adapter, original charging cable

Step by step

  1. 30 sec

    Check the regulatory label

    Locate the fine print etched or printed directly onto the surface of the power adapter. Look for the 'Output' line, which lists voltage (V) and amperage (A). Multiply these two numbers (V × A = Watts) to determine the total wattage of the charger.

    Note: If the output lists multiple voltage/amperage profiles, use the highest value to determine the maximum rated capacity.
  2. 1 min

    Review System Information on macOS

    Connect your charger to your Mac. Hold the Option key, click the Apple menu (), and select System Information. Navigate to the Power category in the left sidebar and look under the AC Charger Information section to see the Wattage field.

    Note: This will only display information if the device is actively drawing power from the adapter.
  3. 1 min

    Use Windows Device Manager

    Connect the adapter to your Windows PC. Right-click the Start button and select Device Manager. Expand the Batteries section, right-click Microsoft ACPI-Compliant Control Method Battery, select Properties, and check the Details tab for power delivery information.

    Note: Some third-party manufacturers include proprietary management software that displays wattage more clearly.
  4. 1 min

    Use a USB-C power meter

    Insert a hardware USB-C power tester between your charging cable and the wall adapter. This device provides a real-time, accurate readout of the exact wattage being delivered to the connected device.

    Note: These meters are the most accurate way to verify the actual output rather than the theoretical maximum.
  5. 30 sec

    Confirm cable specifications

    Even if your charger provides high wattage, ensure your cable supports it. Check the USB-C connector housing for small labels indicating 60W or 100W/240W capacity, as older or standard cables may cap the power delivery regardless of the charger's capabilities.

    Note: Cables capable of delivering over 60W typically feature an E-Marker chip to negotiate power delivery.