How many times will a power bank charge your phone? Pick your phone and a power bank — or type the numbers.
Choose a phone (or type its battery) to see the answer.
A power bank’s rating is the capacity of its cells at 3.7 volts. About 60–70% of it reaches your phone after the voltage is raised and some energy is lost as heat, so the calculator divides 60–70% of the power bank’s capacity by your phone’s battery. Phones rarely charge from 0%, so a top-up from 20% to 80% needs only 60% of the battery.
The phone batteries come from each phone’s spec page — see the phone charging guides.
About 60–70% of a power bank’s rated capacity reaches the phone, so a 10,000 mAh power bank gives roughly 6,000–7,000 mAh: about 2 full charges for a 3,000–3,500 mAh phone and about 1.2–1.4 for a 5,000 mAh phone.
The rating is measured at the cells’ own 3.7 volts. Charging a phone means raising that to 5 volts or more, and some energy is lost as heat, so only about 60–70% reaches the phone.
A 10,000 mAh power bank holds about 37 Wh, under the 100 Wh limit airlines generally allow. Power banks go in your hand luggage, never in checked bags.