How to quickly calculate the wattage of any iPhone charger

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How to calculate wattage of iPhone charger
A simple calculation is all you need.
Image: Killian Bell/Cult of Mac

Looking for an iPhone charger that will deliver the fastest possible charging speeds? Forget the one that came bundled with your old iPhone and pick up a super-speedy 20W adapter instead.

If you can’t find the wattage of an adapter in its product description, we’ll show you a quick and easy way to calculate it yourself so you don’t waste your hard-earned cash on the wrong one.

Save $29 on Apple’s new MagSafe Duo Charger for iPhone, Apple Watch

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MagSafe Duo Charger
Get yours today for just $99.99.
Photo: Apple

Apple’s new MagSafe Duo Charger for iPhone and Apple Watch just got its first discount — and it’s a big one. Bag yours from Best Buy today for just $99.99, down from $129, before the price returns to normal.

This post contains affiliate links. Cult of Mac may earn a commission when you use our links to buy items.

Apple’s $129 MagSafe Duo charger could ship December 21

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MagSafe Duo
Should ship in time for the holidays.
Photo: Apple

Apple still hasn’t announced a date for its MagSafe Duo charger, which could stir fears among more nervous fans of a repeat of the much delayed, ill-fated AirPower charger of a few years back.

Have no fear, though: If an Apple reseller in Switzerland is to be believed, we don’t have too much longer to wait until the MagSafe Duo will be shipping.

$129 MagSafe Duo charger is slower than $49 MagSafe puck

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MagSafe Duo
It maxes out at 14W, but iPhone 12 can charge at 15W.
Photo: Apple

Apple’s fancy new MagSafe Duo charger delivers less power than the more affordable MagSafe puck, despite its $129 price tag.

Its charging power can be increased — if you cough up more for a beefier charging adapter — but even then, the MagSafe Duo is unable to match the solo MagSafe in charging speeds.

Apple resurrects MagSafe as snap-on iPhone accessory system

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How it works
What's old is new again.
Photo: Apple

Apple’s beloved MagSafe branding made its return at Tuesday’s “Hi, Speed” Apple event. And, if it’s not quite like it was before, isn’t that the same as every single story about something being brought back from the beyond?

The new, different version of MagSafe will allow users to snap on accessories to the back of their iPhones. Think wallets, cases and — in a new move for Apple — its first official wireless charging pads for iPhone.