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Power bank charges

About 65% of a power bank's rated capacity reaches a phone after conversion losses: a 10,000 mAh power bank gives about 1½ full charges to a phone with a 4,000 mAh battery.

How to use it

  1. Enter the power bank’s capacity in mAh.
  2. Pick your phone, or enter its battery size.
  3. See about how many full charges it gives.

More instruments

Glove sizeHat sizeShoe size from your footRing size for wide bandsDiamond size by caratRing sizeBracelet sizeSize converterNecklace lengthGold in plain numbersHoop earring sizeBirthstone by monthRug sizeRug pad sizePillow insert sizeThrow sizeGift pickerCost per wearSunscreen amountSize across cutsBra and swim sizesKids’ sizesLaptop bag sizeTowel sizesJewelry in waterPrintable ring sizerPrice in your currencyCandle first burnBedding sizesOrder-by dateDuties by countryAll instruments

A general guide. Brands cut and finish differently, so each piece’s own size chart and details win.