USB-C charging explained: which charger fits my laptop or phone?
Short answer
Most USB-C chargers work with most USB-C phones and laptops, but the charging speed depends on the wattage and on USB Power Delivery support. Choose a charger at least as strong as your device needs: around 20–45 W for phones, often 30–100 W for laptops. A weaker one charges slowly.
Watts and USB Power Delivery
USB Power Delivery (USB PD) is the common standard that lets a charger and a device agree on how much power to use. The device only takes what it can handle, so a stronger charger is safe. A 65 W laptop charger can charge a phone without problems.
The other way round is where it gets slow. A small phone charger on a laptop may only keep it from draining, especially under load, and some laptops refuse to charge from very weak chargers.
What to check when buying a charger
A few points decide whether a charger is the right one for your devices.
- The wattage your device needs: check the original charger or the spec sheet.
- USB Power Delivery support. Samsung phones also use PPS for their fastest charging.
- Multi-port chargers share their power, so each port gets less when several are in use.
- GaN chargers are smaller and lighter for the same wattage.
- Some brands' fastest charging modes only work with their own charger.
The cable matters too
Not every USB-C cable carries the same power. Standard cables handle up to 60 W. For more, such as 100 W or the 240 W allowed by newer USB PD versions, you need a cable rated for it. Look for the wattage on the packaging or the cable itself.
The EU common charger rules
Since the end of 2024, new phones, tablets, cameras, headphones and many other small devices sold in the EU must have a USB-C port. Laptops followed in April 2026.
Devices may be sold without a charger in the box. The packaging must show whether a charger is included, and the device information must state how much charging power it needs.
| Device | Typical charger |
|---|---|
| Earbuds, smartwatch | Small charger is enough |
| Smartphone | 20–45 W |
| Tablet | 20–45 W |
| Thin and light laptop | 30–70 W |
| Performance laptop | 90–140 W |
| Gaming laptop | Often needs its own, stronger charger |
Questions and answers
Can I charge my phone with my laptop charger?
Yes, if both use USB-C with USB Power Delivery. The phone only takes the power it can handle, so it is safe.
Will a 30 W charger work with my 65 W laptop?
Often yes, but slowly. It may charge well when the laptop is off or idle, while under heavy use the battery can still drain. Some laptops won't charge from chargers that are too weak.