Take the 2-minute tour ×
Ask Different is a question and answer site for power users of Apple hardware and software. It's 100% free, no registration required.

When looking at usage stats in iOS (data sent/received), are the megabytes/gigabytes in base-10 or base-2?

The docs are not entirely conclusive (since it doesn't address usage specifically) but suggests base-2 is used for iOS device capacities.

So which is it?

share|improve this question
add comment

1 Answer 1

I wasn't able to find conclusive documentation on this so I tested it. I found that iOS uses the base-10 definition when showing usage.

That is, if you send a large file, say 10 mebibytes (10 × 220, or 10485760 bytes), it will report it in megabytes, counting a megabyte as 1,000,000 bytes (not 1,048,576 bytes).

So that 10 MB, shows up as 10.4 MB:

10mb usage

(I'm not suggesting that there's anything nefarious going on here related to billing or data limits.)

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.