For most phones and tablets, a 60W USB-C cable is enough. For a laptop that needs more than 60W, choose a 100W cable if that covers the laptop’s maximum USB-C charging input, or choose a 240W cable for compatibility with USB Power Delivery charging above 100W. Cable wattage is only one part of the decision: the device, charger port and cable must all support the required power, while data speed, monitor output, USB4 and Thunderbolt support must be checked separately.
This guide covers USB-C-to-USB-C cables used with USB Power Delivery, often shortened to USB PD. USB PD supports up to 240W when compatible equipment uses Extended Power Range operation. USB-IF published USB Power Delivery Revision 3.2 Version 1.2 on September 14, 2026.
Match the device charger and cable
Charging is a three-part chain. The device requests a supported power level, the charger offers power profiles from the port in use, and the cable reports its capabilities and carries the power safely. In practice, charging cannot exceed the lowest compatible limit in that chain.
A 240W cable does not force 240W into a phone. USB PD lets compatible equipment negotiate power, so a phone designed to charge at about 30W will request only the power it supports. Actual charging can still slow as the battery fills, or when the device is warm.
The reverse mismatch can reduce performance. A laptop able to accept 100W through USB-C can be restricted to 60W by a 3A, 60W cable. Depending on the laptop and workload, it may charge slowly, maintain its battery level, or continue to lose charge while in use.
| Cable rating | Electrical capability | Best use | Main limitation |
|---|---|---|---|
| 60W | Up to 3A at up to 20V | Phones, tablets and laptops that need 60W or less | Can bottleneck equipment that needs more than 60W |
| 100W | Up to 5A at 20V | Laptops requiring more than 60W and no more than 100W | Cannot support USB PD Extended Power Range charging above 100W |
| 240W | Up to 5A at up to 48V with compatible Extended Power Range equipment | Laptops that accept more than 100W over USB-C, or a flexible charging cable for several devices | May cost more or be thicker than a charging-only cable |
A cable rated above 3A needs an electronically marked chip, commonly called an e-marker, which communicates the cable’s capabilities. A 5A cable is needed for conventional USB PD charging above 60W, including 65W, 90W and 100W. A 240W cable must be designed and marked for Extended Power Range operation.
An e-marker does not prove that a cable supports fast data. A 5A charging cable can still provide only USB 2.0 data speeds.
Choose the right power rating for each device
First, check the device maker’s stated USB-C charging requirement or maximum USB-C input. Then check that the charger can supply that power from the particular port you will use. With multiport chargers, connecting other devices can reduce the power available from one port.
| Shopping scenario | Recommended power rating | What else to check |
|---|---|---|
| Phone | 60W | The charging protocol required by the phone, including Programmable Power Supply support where the maker specifies it |
| Tablet | 60W for most models | Choose 100W or 240W if the same cable will also charge a laptop or connect to a dock |
| Thin laptop | 60W if its maximum input is 60W or less; otherwise 100W or 240W | Many compact laptops use 65W or higher adapters, so a 60W cable can be a bottleneck |
| High-power laptop | 240W if it accepts more than 100W through USB-C | Confirm that the specific USB-C port supports that charging level; some laptops use a separate proprietary power connector |
| Dock or USB-C monitor | Match or exceed the dock’s stated host-charging output | Data rate, video support and the power the dock reserves for itself |
| Travel kit | 240W for the widest USB PD charging compatibility | Buy a high-speed cable as well only if you connect storage, displays or docks |
A good 100W cable remains a sensible choice for a laptop that will never need more than 100W. A 240W cable is not automatically faster, however: the charger and laptop must both support the relevant higher-power USB PD profiles. For a new general-purpose cable, 240W can provide more headroom, provided its data specification is also suitable.
Charging wattage does not indicate data or video capability
USB-C identifies the connector shape, not a single set of features. A cable advertised as 240W might transfer data only at USB 2.0 speed, while another 240W cable might be marked for USB 20Gbps, USB 40Gbps or USB 80Gbps. The power rating and data rate are separate specifications.
For charging alone, basic USB 2.0 data is usually sufficient. For an external solid-state drive, a dock or a high-resolution camera, choose a cable with its data rate stated clearly in gigabits per second. The connection will operate at the highest speed supported by every part of the chain: computer, cable and peripheral.
Monitor support is also separate from wattage. DisplayPort Alternate Mode requires compatible source and display or dock ports, plus a full-featured USB-C cable. The available resolution and refresh rate depend on the source device, dock or adapter, display and their supported video standards. Do not assume that a cable labelled only with a wattage can carry video.
USB4 and Thunderbolt compatibility should be explicit as well. For a USB4 dock or drive, buy a cable marked for the required USB data rate and USB4 support. If dependable Thunderbolt operation matters, select a cable with the appropriate Thunderbolt certification and symbol rather than relying on a USB-C connector or a high-wattage claim alone.
Read cable markings and choose a sensible length
USB-IF certification rules can make store listings seem confusing. Many cables are still sold as 100W, but USB-IF stopped certifying new 100W USB-C-to-USB-C cable products after December 22, 2021. Under the current USB-IF cable certification scheme, USB-C-to-USB-C cables use 60W or 240W power markings.
That does not make every 100W cable unsafe or obsolete. A 100W cable may be an older certified design or a manufacturer’s stated capability. It does mean that “100W” alone is not a current USB-IF cable certification category. When more than 60W is needed, a certified 240W cable is the clearer current standards-based option.
Look for a Certified USB logo and a power marking on a certified cable or its packaging. Certified USB-C cables other than USB 2.0 cables should also show their supported data rate. Combined markings can identify both specifications, such as 60W 20Gbps or 240W 40Gbps. A certified USB 2.0 cable must show its power capability, while a USB 2.0 data marking is optional.
A logo-shaped graphic is not proof of certification. Check the maker’s exact model or part number in the USB-IF product search. Certification applies to the specific listed product and revision, not necessarily to every cable sold by the same brand. The public list normally defaults to products certified within the previous two years, so an older certified product may require further confirmation from its manufacturer.
| Length choice | Advantages | Tradeoffs |
|---|---|---|
| Short cable | Easy to carry and generally the simplest option for the highest passive data rates | Less convenient between a wall outlet and a desk |
| 1.5m to 2m | Practical for bedside and laptop charging | Can be thicker when it combines 5A charging with high-speed data |
| Longer cable | More freedom to place devices | Signal and electrical design are more demanding; some high-speed cables use active electronics |
For travel, one longer 240W charging cable with basic data and one short USB4 or Thunderbolt cable for a dock or storage can be lighter and less expensive than one cable designed for every task. If you want a single cable, verify three details before buying: adequate wattage, the required data rate and explicit support for video, USB4 or Thunderbolt where needed.
