One gigabyte of storage can hold about 250 MP3 songs. This number assumes the songs are 3 minutes and 30 seconds long and have a bit rate of 128Kbps. Some longer songs or those with higher bit rates may be up to twice as large.
There are multiple methods for reducing the size of MP3 files. When transferring music from iTunes to an iPhone or iPod, users are given the option to automatically convert all songs to 128Kbps AAC files upon importing them into iTunes, which can greatly increase the number of songs a device can hold. Some music sources, such as BandCamp, allow the user to select different formats and bit rates when downloading the file to avoid the hassle of converting them in the future.