Jon Alper's probably insufficiently humble opinion

*****UPDATE***** I should have known…  get a better more flexible annoyance free calculator from AJA here: http://www.aja.com/products/software/ (It actually seems to be a little conservative in its calculations. I see this as a good thing.)

http://www.digital-heaven.co.uk/freeware

Offers some handy tools including an OSX Dashboard Widget to do calculations on how much disk space your footage will use in the various formats FCP supports. It’s very handy but:

• Digital Heaven insist on an email address to send you the download links.

• The widget will try to connect to Digital Heaven’s server. Blocking this with LittleSnitch does not prevent the widget from functioning.

Other tools not yet tested.