USB-C Charger Wattage Guide: How Many Watts Do You Need for Your Phone, Tablet or Laptop?

The short answer: find the wattage printed on the charger that came with your device and buy a USB-C charger that is at least that number. For most phones, a 20W to 30W charger is a sensible starting point. Tablets usually need 20W to 45W, thin laptops 45W to 65W, and larger laptops or a multi-device desk setup may call for 100W. The PrimeCables chargers in the examples below run from $8.95 to $34.99, as of November 5, 2026, and most of them are on sale until November 10.

USB-C chargers are sold by wattage, and the numbers range from 5W up to 240W. Pick too low and a laptop may charge slowly or not at all. This guide shows how to choose the right wattage, what to check on a multi-port charger, and why the cable matters too. You can browse every option on the Wall Charger & Wireless Charger page and the Power Charger & Adapter page.

Step 1: Find out what your device needs

The most reliable source is the charger that shipped with the device. Look for the small print on the brick, which lists output values such as 20V/3.25A. Multiply volts by amps to get watts (20V x 3.25A = 65W). If the original charger is gone, look in the device manual or the manufacturer’s specification page for the supported charging power. This assumes the device charges over USB-C; many laptops with a round barrel-plug charger do not.

As a rough guide only, and always subject to what your device maker says:

• Phones: often 20W to 30W for fast charging.
• Tablets: commonly 20W to 45W.
• Thin laptops and ultrabooks: commonly 45W to 65W.
• Larger laptops: often 90W or more. Above 100W, the chargers below may charge slowly.

USB Power Delivery (PD) lets the charger and device agree on a voltage and current. In general a device takes the power it needs, so a charger with a higher rating than your device requires is usually fine, while one with a lower rating may charge slowly.

Step 2: Match the wattage to the charger

20W: phone and small-device charging

The 20W dual USB-C wall charger lists two USB-C ports, PD 3.0 and a 20W rating, and its page describes charging a smartphone to 50% in about 30 minutes. The page lists 5V/3A, 9V/2.22A and 12V/1.67A outputs and states ETL and FCC certification. The page also notes that using both USB-C ports at once gives 5V/3A output.

30W: phones, tablets and some small laptops

The 30W GaN mini USB-C charger is a single-port charger described as measuring 1.3 x 1.2 x 1.2 in. It lists PD 3.0 and PPS support and 5V to 20V outputs up to 30W. Its page notes that the prongs are not foldable and that cables are not included.

45W: tablets and thinner laptops

The 45W GaN USB-C PD charger lists a single USB-C port with outputs up to 20V/2.25A (45W), a foldable plug, UL certification, and dimensions of 1.1 x 1.8 x 1.8 in.

65W: many everyday laptops

The 65W GaN travel charger has two USB-C ports and one USB-A port. The page lists up to 65W on USB-C and up to 30W on USB-A, a foldable plug and UL certification. The page names MacBook Air and Dell XPS among compatible devices, but confirm your own model’s requirements before buying.

100W: bigger laptops and several devices at once

The 100W GaN wall charger has two USB-C and two USB-A ports. Its page lists up to 100W on a single USB-C port and a total of 100W. When several ports are in use, the power is shared: the specification table lists USB-C 1 at up to 65W and USB-C 2 at up to 20W in multi-port use.

Step 3: Check multi-port charging

A charger’s headline wattage is often the most it can deliver in total, or from one port alone. When you plug in a phone and a laptop together, the output is generally split between ports. If you regularly charge a laptop and a phone at the same time, look at the per-port numbers on the specification table, not just the number in the title.

Step 4: Do not forget the cable

The charger is only half of the setup. A cable is made for a certain power level, and the product page states it. For example, the 60W USB-C to USB-C cable lists 60W (20V/3A) and 480Mbps data. The 100W USB-C to USB-C cable lists 100W (20V/5A) with an LED charging indicator, and the 240W USB-C to USB-C cable lists up to 240W and comes as a 2-pack of 2 m cables. All three transfer data at USB 2.0 speed (480Mbps), so they are charging cables first. If you need fast data transfer as well, check the data speed on the page. You can compare more on the USB-C cables page.

Also see our guide to USB-C adapters and hubs if you want to add video or Ethernet to the same port, and our surge protector guide for powering a whole desk.

Examples at a glance

Prices are as of November 5, 2026. Sale prices are noted, with the regular price shown on the page.

A quick checklist before you order

• What wattage does your device’s original charger or manual list?
• Do you need one port or several? Check the per-port output.
• Is your cable rated for the power you plan to use?
• Are cables included? On the pages above, cables are not mentioned as included, and the 30W page states they are not.

Frequently asked questions

Can I use a higher-wattage charger than my laptop came with?

In general, USB Power Delivery lets the device draw only what it needs, so a higher rating is usually fine. Check your laptop maker’s guidance, especially for brand-specific charging protocols.

Can I charge my phone with a 65W laptop charger?

USB-C chargers are designed to work across devices, and the product pages above list compatibility with phones and tablets as well as laptops. Your phone draws only what it needs; its top speed depends on both supporting the same fast-charging standard.

What happens if my charger’s wattage is too low?

The device may charge slowly, or may not charge while it is in heavy use. Compare against the number on your original charger.

What does GaN mean?

GaN stands for gallium nitride. The product pages describe GaN chargers as smaller and more efficient, with less heat, than standard chargers.

Do I need a special cable for 100W charging?

Check the cable’s rating on its page. The cables above list 60W, 100W and 240W ratings, so choose one that matches or exceeds your charger.

Prices as of November 5, 2026. Check each product page for the current price, availability and specifications.