LaptopCompat

Guide

Can You Charge a Laptop with a USB-C Phone Charger?

Last reviewed 10/6/2026

Often yes: a laptop that charges over USB-C with USB Power Delivery will accept a phone charger, but it charges slowly, and may not gain charge under load, because phone chargers usually supply 18 to 30 W while most laptops are designed for 45 to 100 W. It will not work at all if the laptop charges only through a barrel-plug port or the charger does not support USB Power Delivery.

A certified USB-C charger negotiates the power with the laptop, so a low-wattage charger will not damage it.

Quick steps

  1. Check that the laptop charges over USB-C. Look for a USB-C port with a charging or power symbol, and confirm on the manufacturer's specification page that the port supports Power Delivery input. The USB-C charging page for each model on LaptopCompat shows this with its source.
  2. Read the charger's label. A USB Power Delivery charger lists several output levels such as 5 V, 9 V and 20 V. Wattage is volts times amps: 20 V at 3 A is 60 W.
  3. Compare with what the laptop needs. Most laptops list a recommended wattage (for example 65 W). A charger below that still works but charges slowly, and under heavy load the battery may keep draining.
  4. Use a suitable cable. Cables rated for 3 A carry up to 60 W. Charging above 60 W (up to 100 W) needs a 5 A cable with an e-marker chip.

Why wattage matters

Laptops need more power than phones. When the charger supplies less than the laptop uses, the difference comes from the battery, so the percentage may fall while you work. Some laptops also show a slow-charger warning, and a few refuse to charge from a source below a minimum wattage.

Higher wattage is fine

A charger with more wattage than the laptop needs is safe, because the laptop only draws what it needs. It does not charge faster than the laptop's own maximum.

Frequently asked questions

Will a phone charger damage my laptop?

A certified USB Power Delivery charger will not damage a laptop that supports USB-C charging, because the two agree on the voltage and current first. A charger that does not support Power Delivery may not charge it at all.

Why does my laptop charge slowly or not at all with my phone charger?

Because the charger supplies less power than the laptop uses. At 18 to 30 W the battery may charge slowly when the laptop is idle and drain when it is busy.

Can I charge any laptop through a USB-C port?

No. Only a USB-C port that supports Power Delivery input can charge a laptop, and many laptops have USB-C ports for data and video only. Check the manufacturer's specification.

USB-C charging in our database

258 of 292 laptops in our database charge over USB-C (88%). Among those with a recommended charger wattage, the median is 100 W; 8 recommend 65 W or less and 29 recommend 100 W or more.

Laptops with the lowest recommended USB-C wattage (per brand)

Laptops that charge over USB-C

Verified examples from our database (highest charger wattage per brand):

Explore nextLaptop USB-C, Thunderbolt & charging reportHow many laptops charge over USB-C, and the adapter wattages and connectors in our database.

More guides

How Much Wattage Does My Laptop Charger Need?How to determine the minimum and recommended charger wattage for a laptop, and why higher isn't always required.Can I Use a Higher-Watt USB-C Charger?Whether it's safe to charge a laptop with a USB-C charger rated higher than the laptop's own adapter.How to Check Your Laptop Model (Windows, Mac, Linux)Find your exact laptop model in a minute: Windows, Mac and Linux steps, plus where Dell, HP, Lenovo, ASUS, Acer and MSI print the model on the laptop.
All guides →