Online calculators for the size of MP3 and WAV files. * Creates an online MP3 file size calculator by providing running time and bit rate. * Creates an online WAV file size calculator with inputs for running time, channels, sample rate, and bit depth. * Each calculator shows the approximate file size that would be produced. * Add calculators to your website pages with these shortcodes: [mcafc-mp3] and [mcafc-wav]. * Set the font size and button color of the calculators on the settings page.