Not a new piece of software, but it’s cool, free and perfect for those of us who can’t do math.

Music Math is a freeware which converts music values (BPM, transpose, Delay, Samples, ms, Hz, Timestretch %, Notes ). Music-Math has 7 conversion functions: Tempo Change, Transpose, Delay, Tap Tempo, Samples, Notes and SMPTE:

- Tempo : computes the equivalent TimeStrecthing from the original and new tempos.
- Transpose: converts semi tones to TimeStrecthing values
- Delay : convert tempo to musical duration (ms) or equivalent frequencies (Hz), ie for LFOs rates.
- Tap : Tap the tempo
- Samples : convert samples duration (in samples) to tempo or tempo to sample duration.
- Notes: convert MIDI notes to equivalent frequencies (Hz)
- SMPTE: add or substract SMPTE value

More here