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⚡ Electronics · USB-C

USB-C Power Delivery Charging Power Calculator

Estimate USB-C PD power limits based on charger, device, cable wattage and a selected PD voltage profile.

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Calculation inputs

Change any value for an instant recalculation.

Available wattage in this negotiated profile.
The device-side acceptance limit.
Use a supported, properly rated cable.
Both charger and device must support it.
Calculation inputs are saved locally in your browser.

How is it calculated?

Theoretical power is bounded by charger power in the selected PD profile, device input limit, cable rating, and voltage × supported cable current (3 A for standard 60 W cables, 5 A for correctly rated high-current cables). Actual negotiated power depends on PD profiles, PPS/EPR, thermal limits and state of charge. This is not a USB compliance tester.

Frequently asked questions

Does a 240 W cable always deliver 240 W?

No. Both charger and device must support an appropriate USB PD EPR profile.

Can a 100 W charger force a phone to charge at 100 W?

No. The phone may negotiate a much lower limit.

Equipment related to this calculation

Practical, non-promotional buying considerations. Future partner recommendations will be clearly disclosed.

USB-C cable

Look for rated power, certification markings and electronic identification where required for higher currents.

USB Power Delivery charger

Supported PD profiles and device compatibility matter more than the headline wattage.

Frequently asked questions

Does a 100 W charger always charge at 100 W?

No. The negotiated USB Power Delivery profile and the capabilities of the device and cable determine the limit.

Does every USB-C port support fast charging?

No. The connector shape alone does not guarantee Power Delivery or a particular charging wattage.