Why does blockchain.info say the blockchain is 12.x GB but my data folder is 15+

[manuel]

Any ideas?

I'm using the latest version of the standard bitcoin-qt.

https://blockchain.info/charts/blocks-size

[Cubic Earth]

Are you running OS X?  For a few years now, Apple has decided to measure amounts of data in base 10, and not in binary, as has been the convention since the beginning of computers.  As a result, any set of data will appear to be bigger when you use OS X to measure its size, at least when you compare the results to those generated by windows, linux, or just about any non-apple tool out there.

[empoweoqwj]

Are you running OS X?  For a few years now, Apple has decided to measure amounts of data in base 10, and not in binary, as has been the convention since the beginning of computers.  As a result, any set of data will appear to be bigger when you use OS X to measure its size, at least when you compare the results to those generated by windows, linux, or just about any non-apple tool out there.

Yeah, Apple is weird like that. Be interesting to see if that is the answer.