The Edit — Gadgets
USB-C Laptop Chargers: What the Watts Have to Match
A USB-C charger and a USB-C cable each have their own ceiling, and the lower one wins. Cables without an e-marker chip stop at 60W, whatever the charger on the other end claims.
This guide is research-led: we have not handled these units ourselves. If you buy through our links we may earn a commission — it never changes a pick. How we choose
Nothing here was used or tested. The page reads the USB-C specification and the makers’ published figures, and the charger shown is ranked as How we choose describes.
Anker Compact Foldable 100W USB-C Laptop Charger
Good fit You want one charger for a laptop, a tablet and a phone
Not for Your laptop needs the full 140W
The charger, the cable and the laptop each set a ceiling
USB-C charging negotiates: the laptop asks for power, the charger offers what it has, and the cable reports what it can carry. The lowest of the three is what you get, which is why a 100W charger can still trickle-charge a laptop.
Standard USB Power Delivery tops out at 100W, at 20 volts and 5 amps. Revision 3.1 added an Extended Power Range that reaches 240W, at 48 volts and 5 amps, for the largest laptops.
Cables without an e-marker stop at 60W
A USB-C cable carries a chip, the e-marker, that tells the charger what it can handle. Any cable rated above 60W has to have one. Without it, the link is capped at 60W however capable the charger and laptop are.
Above 100W the requirement tightens again: an EPR cable needs an e-marker set as EPR-capable for 48 volts and 5 amps, and USB-IF requires the 240W mark to be printed on the cable or its moulding.
| Cable | Chip | Ceiling |
|---|---|---|
| Basic USB-C, no e-marker | None | 60W |
| E-marked 100W cable | Standard e-marker | 100W |
| EPR cable, 240W marked | EPR e-marker | 240W |
This is the most common reason a new charger disappoints. The cable in the drawer is often the 60W one that came with a phone.
What your laptop actually asks for
The simplest guide is the adapter the maker ships. Apple lists 67W, 70W and 96W adapters for the 14-inch MacBook Pro and a 140W for the 16-inch, and it tests the 13- and 15-inch MacBook Air with M4 on the 70W adapter.
| Laptop | Maker’s adapter | Buy at least |
|---|---|---|
| MacBook Air, 13 and 15 inch M4 | 70W | 65W to 70W |
| MacBook Pro 14-inch | 67W, 70W or 96W | 96W to 100W |
| MacBook Pro 16-inch | 140W | 140W, with an EPR cable |
| Windows ultrabook | Usually 65W | 65W |
| Gaming laptop | Often over 200W | Its own adapter |
A charger below that figure still works. It charges more slowly, and under a heavy load it may only hold the battery level steady rather than fill it.
One charger for everything is the practical buy
A 100W charger covers a laptop, a tablet and a phone, and splits its output when more than one is plugged in. That is why the wattage on the box is a total rather than a promise for each port.
Anker Compact Foldable 100W USB-C Laptop Charger
A folding 100W charger that ships with a 5 ft cable rated for the job, which is where most kits fall down.
Current price shown on Amazon. We may earn a commission.
| Output | 100W, USB-C PD |
|---|---|
| Cable | 5 ft, included |
| Owners report | Honest 100W, compact |
4.6 across 6,233 ratings, and what owners of the Anker 100W charger report is that it delivers an honest 100 watts, including to demanding machines such as an ASUS ROG Zephyrus G14 and a Steam Deck.
It folds, it is smaller than most bundled laptop adapters, and it ships with a 5 ft cable rated for its output. That last point removes the 60W cable trap in one purchase. For a 16-inch MacBook Pro, buy the 140W adapter instead.
Buy it if
- You want one charger for a laptop, a tablet and a phone
Don't buy it if
- Your laptop needs the full 140W
Watts through a hub are not the watts at the wall
Plugging the charger into a hub rather than the laptop adds a third device to the negotiation. A hub’s pass-through port delivers less than it receives, because the hub keeps some for its own ports, and how much it keeps is on the listing rather than on the box.
Owner reports on hubs describe pass-through that works well on one unit and not at all on another, which is the single most mixed feature in that category. USB-C hubs, compared sets out which ones own that complaint, and what mAh measures covers the same arithmetic for a power bank.