MixMeister BPM Analyzer is a free program you can use to determine the exact BPM (beats per minute) of any song. BPM Analyzer allows you to:

Calculate extremely accurate BPM counts for any song
Drag and drop music files from Windows Explorer
Display and sort files by Title, Artist, or BPM
Update ID3 tags in your music files with exact BPM information
Easily print BPM reports for your entire music collection
Export BPM counts for use in other programs
Free to use and distribute for non-commercial purposes