For a free, easy, fast and simple conversion of FLAC to MP3 use FLAC to MP3 Converter.
As its name suggests, this tool is the simplest way of converting your FLAC files to MP3. This tool with a clean and clear interface is free from any type of adwares or spywares. This smart and quick tool can easily copy and save audio tags from the source FLAC files to the destination MP3 files. This tool supports features like: it can write ID3v1, ID3v2 and APE MP3 tag; it supports the batch mode where it can convert hundreds of FLAC files instantly, supports a swift and simple interface, it is fully optimized for SSE/Hyper thread technology and you can get extra speed boost if you have multi-core CPU, supports a Windows Explorer-Style user interface, it can effortlessly search, add and manage the FLAC files to be converted, and much more.
This must have tool uses the latest FLAC codec and Lame MP3 encoder which is generally believed as the best MP3 encoder.