If you want to fast charge both of these devices at the same time you’ll need to add these numbers. While your iPhone may be capped to a charge speed of 18 watts, your MacBook Pro might fast charge at 67 watts.

Lastly, you need know the maximum charging speeds that your devices support to determine the wattage output you need from a charger.

We’ve looked at the top options and tested them in our lab to find the best models listed below. That’s especially handy with the increasing number of tablets and laptops that now support fast charging. This reduces not only charging time, but how much stuff you have to carry as well since you won’t have to pack different power bricks for each device. The most popular adapters often offer multiple connection types like USB-C and USB-A to provide power to a wide variety of gadgets. Thanks to the stiff competition among accessory manufacturers you’ll find plenty of high performance fast chargers with multiple ports for nearly the same price as a basic charger. But connected to a 20-watt fast charger, that same dead iPhone hits 50 percent in just 30 minutes-a third of the time.

For example an iPhone using a classic 5 watt power brick takes over 1.5 hours to reach 50 percent battery when it’s completely dead. These types of plugs work with your device’s circuit board to safely deliver higher amounts of electricity to charge your devices in a shorter amount of time. If you’ve found yourself needing one of these power adapters, then now is a great time to upgrade to a model that supports fast charging. You’ve likely noticed that more electronics, from phones to smartwatches, are being sold without a wall charger in the box.

Charging cable for macbook air