When you shop for a USB-C cable, you’ll often see them rated at 60W or 100W (and increasingly 140W or 240W). It’s tempting to assume bigger is always better, but the right choice depends on what you’re charging. Here’s what those numbers mean and how to pick.

What the watt rating actually describes

The watt rating tells you the maximum power a cable is built to carry safely. It is a ceiling, not a fixed speed — a 100W cable doesn’t force 100W into your phone; it simply allows up to 100W if the charger and device both want it. Your phone only ever draws as much power as it’s designed to, so a higher-rated cable will never overcharge or harm a smaller device.

How the watt levels break down

• Up to 60W: Achieved at 20V and 3A. This covers every phone on the market with room to spare, plus tablets and many smaller laptops. Standard USB-C cables without a special chip top out here.
• 100W: Achieved at 20V and 5A. To carry 5 amps safely, a cable must include an “e-marker” chip that tells the charger it can handle the higher current. This range is for laptops and the most powerful fast-charging phones.
• 140W and 240W: Newer USB-C standards for high-performance laptops. These always require e-marker cables and are overkill for phones.

So which should you buy?

Choose a 60W cable if…

You mainly charge phones, earbuds, tablets and accessories. A quality 60W cable fast-charges every phone available today, is usually thinner and more flexible, and costs less. For most people, 60W is the sensible, no-compromise choice.

Choose a 100W cable if…

You also want to charge a USB-C laptop, a Steam Deck, or a phone that supports very high-wattage charging — or you simply want one cable that does everything. A 100W e-marked cable is the versatile “buy once” option for a household with mixed devices.

Will a 100W cable charge my phone faster than a 60W one?

No — not unless your phone actually draws more than 60W, which very few do. If your phone’s maximum charging speed is, say, 27W, it will charge at exactly the same rate on a 60W and a 100W cable. The extra headroom only matters for devices that can use it, like laptops. So you’re paying for capability you may never need if you only own a phone.

The catch with cheap “100W” cables

Because the e-marker chip and thicker conductors add cost, some very cheap cables claim high wattage without truly supporting it. A genuine 100W cable will mention the e-marker or 5A rating. If a cable is suspiciously cheap for its claimed rating, treat the claim with caution — under-built cables run hot under load.

Don’t forget the charger

The cable sets a ceiling, but the charger and phone decide the actual speed. A 100W cable paired with a 20W charger still only delivers 20W. To get higher speeds you need a charger rated for the power you want, too. For the full picture, read our guide to how fast charging works.

In short

For a phone-only household, a good 60W cable is all you need. If you want one cable to charge laptops and phones alike, step up to a properly e-marked 100W cable. Either way, build quality matters as much as the number — browse our rated USB-C cables to find a reliable match.