How many watts to fast charge a phone? For most modern phones the answer sits somewhere between 20W and 60W, and a bigger charger is not always a faster one. Your phone decides how much power it accepts, and your charger and cable have to keep up. In this guide, we explain what popular phones actually need, why some “fast” chargers still feel slow, and how to pick one that fits your phone. Want a quick answer first? Try our free Is My Charger Fast Enough? tool.
Table of Contents
⚡ How Many Watts to Fast Charge a Phone: Quick Answer by Model
The table shows each maker’s own fast-charging rating and the kind of charger it assumes. Apple and Google give a charge time with a charger size, while Samsung gives a wattage. These are “up to” ratings for wired USB-C charging with a compatible charger, so real speeds vary.
| Phone | Maker’s fast-charge rating | Charger to look for | Standard |
|---|---|---|---|
| iPhone 18 Pro, 18 Pro Max | Up to 50% in around 15 minutes | 60W-capable adapter or higher with AVS | USB PD 3.1 or newer with AVS |
| iPhone 17, 17 Pro, 17 Pro Max | Up to 50% in 20 minutes | 40W adapter or higher | USB PD |
| iPhone Air | Up to 50% in 30 minutes | 20W adapter or higher | USB PD |
| Galaxy S26 | Up to 25W | 25W or higher | USB PD with PPS |
| Galaxy S26+ | Up to 45W | 45W or higher | USB PD with PPS |
| Galaxy S26 Ultra | Up to 60W | 60W or higher | USB PD with PPS |
| Pixel 10, Pixel 10 Pro | Up to 55% in about 30 minutes | 30W USB-C PPS charger or higher | USB PD with PPS |
| Pixel 10 Pro XL | Up to 70% in about 30 minutes | 45W USB-C PPS charger or higher | USB PD with PPS |
| Pixel 10 Pro Fold | Up to 50% in about 30 minutes | 30W USB-C PPS charger or higher | USB PD with PPS |
Where the numbers come from: these are the makers’ own ratings. For Apple, see the tech specs for the iPhone 18 Pro, iPhone 17, iPhone 17 Pro and iPhone Air. Samsung lists the Galaxy S26 charging speeds on its S26 comparison page. Google lists the Pixel 10, Pixel 10 Pro and Pro XL and Pixel 10 Pro Fold ratings in the Google Store. For more detail, see 9to5Mac on iPhone 17 charging and on the iPhone 18 Pro, 9to5Google on Pixel 10 charging and Anker’s S26 charging comparison.
🍎 iPhone 18 Pro: Why the Right 60W Charger Matters
The iPhone 18 Pro and 18 Pro Max ask for more than a plain “60W” label. Apple’s specs call for a 60W-capable adapter that supports USB PD 3.1 or newer with AVS (Adjustable Voltage Supply), a USB PD feature that lets the charger adjust its voltage. A charger with enough watts but without that support may not reach full speed.
So when you shop for an iPhone 18 Pro, look for AVS or PD 3.1 on the charger’s spec list, not just “65W”.
🔌 Why a Stronger Charger Won’t Charge Your Phone Faster
A charger only offers power. Your phone decides how much it will accept, and that limit is often lower than the number on the charger.
Independent testing shows how this plays out. These are measured results from ChargerLAB, as summarised by MacRumors, and not Apple’s official rating:
| Phone | Peak speed measured by ChargerLAB |
|---|---|
| iPhone 17 | About 27–28W |
| iPhone 17 Pro Max | About 36W |
| iPhone Air | About 18–19W |
The iPhone 17 Pro Max hit its 36W peak with Apple’s 40W Dynamic Power Adapter and also with 67W and 140W adapters. In other words, a 140W laptop charger did not charge it any faster than the 40W one. Apple’s 20-minute rating assumes a 40W adapter, and independent tests measured around 36W at the phone. The Is My Charger Fast Enough? tool uses its own conservative phone limits and lists the iPhone 17 Pro and Pro Max at 27W, so its result can differ from these numbers.
So a 100W-plus charger is not an upgrade for your phone. Extra watts only help if you also use that charger for a laptop or tablet.
🧩 USB PD and PPS Explained
Wattage is only half the story. The charger and phone also have to speak the same “language” to unlock fast charging.
- USB PD (Power Delivery): the universal fast-charging standard from the USB Implementers Forum. The charger and phone negotiate voltage and current. iPhones use it, and older USB-A chargers do not support it.
- PPS (Programmable Power Supply): an optional feature of USB PD 3.0 that lets the charger and phone adjust voltage and current in very small steps. USB-IF says new devices and chargers must support PPS to take advantage of it. Samsung’s Super Fast Charging and Google’s Pixel phones rely on it.
The difference is not just theory. In TechARP’s test of the Galaxy S26 Ultra, a 45W charger triggered Super Fast Charging 2.0, while a 65W charger that lacked the required profiles fell back to the basic 25W mode. When you shop for a Samsung or Pixel charger, check that it lists PPS, not just its wattage.
🔗 Does the Cable Matter?
Yes, but less than most people think. For most phones in this guide, a certified USB-C cable rated for 60W (3A) is the usual recommendation. The exception to check is Samsung’s 45W mode on the Galaxy S26+, where Anker recommends a 5A cable with an e-marker chip (see its S26 charging comparison). Buy certified cables from known brands, because cheap unbranded ones may not carry the power they claim.
One more thing to budget for: none of these phones is guaranteed to include a charger. Google’s box for the Pixel 10 contains just a 1 m USB-C cable, and Apple and Samsung have shipped phones without one too.
✅ How to Choose the Right Charger in Three Steps
- Find your exact model. Variants differ a lot: a Galaxy S26 tops out at 25W while the S26 Ultra goes to 60W, and the Pixel 10 Pro XL needs a 45W charger to reach its fastest rating.
- Match the wattage and the standard. USB PD 40W or higher for an iPhone 17, a 60W charger with PD 3.1 and AVS for an iPhone 18 Pro, and a USB PD charger with PPS for a Galaxy or Pixel.
- Use a certified USB-C cable. 60W (3A) for most phones, and check your phone maker’s advice for Samsung’s 45W mode.
Not sure whether the charger you already own is good enough? Our free Is My Charger Fast Enough? tool covers 80+ phone models. If yours is not listed, enter its maximum wattage manually.
Frequently Asked Questions❓
How many watts does an iPhone 17 need to fast charge?
Apple’s 50%-in-20-minutes rating assumes a 40W adapter or higher. That is the adapter size, not the phone’s draw: in ChargerLAB’s tests the standard iPhone 17 peaked at about 27–28W and the iPhone 17 Pro Max at about 36W. A 40W USB PD charger is the safe choice.
What charger does the iPhone 18 Pro need?
Apple’s specs call for a 60W-capable adapter with USB PD 3.1 or newer and AVS, for up to 50% in around 15 minutes. Check that the charger lists AVS support, because one with the right wattage but without it may not reach full speed.
Is a 20W charger enough for an iPhone 17?
It will charge the phone, but Apple’s fast-charge rating assumes a 40W adapter or higher, so expect it to be slower.
How many watts does a Galaxy S26 need?
It depends on the model: 25W for the Galaxy S26, 45W for the S26+ and 60W for the S26 Ultra. Use a charger that supports USB PD with PPS.
How many watts does a Pixel 10 need?
Google rates the Pixel 10 and Pixel 10 Pro with a 30W USB-C PPS charger or higher, and the Pixel 10 Pro XL with a 45W PPS charger.
Will a 100W laptop charger charge my phone faster?
No. The phone sets the limit: ChargerLAB’s iPhone 17 Pro Max reached the same peak of about 36W with Apple’s 40W adapter and with 67W and 140W adapters. A big charger is fine to use, but it must still support the profile your phone needs (PPS for Galaxy and Pixel, AVS for iPhone 18 Pro).
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