There's nothing built-in for this. You might want to estimate based on filename extensions. You could make up a table of average compression ratios for each type of file. This wouldn't be super accurate, but it is something. Eric -----Original Message----- From: bigal@xxxxxxxxxx [mailto:bigal@xxxxxxxxxx] Sent: Monday, November 11, 2002 7:34 PM To: delphizip@xxxxxxxxxxxxx Subject: [delphizip] Compressed size calculation Hello, Is there anything that provides an approximate resulting zip filesize _prior to zipping_ ?? Thanks, Alistair+