how to check the size of software ?

hi
just one simple Q .How can i check the size of software in Mbs or kbs

before installing in ubuntu 7.04 .

i.e if i want to see the size of Multimedia Player (XMMS) before installing

then whats the procedure ? like

Code:

sudo apt-get install xmms xmms-skins xmms-wma

installs the

software without giving its estimated size

asking this because i have 400 mbs/month limit

Code:

user@domain:~$ [B]sudo apt-get install xubuntu-desktop[/B]
Password:
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following extra packages will be installed:
  abiword [....] xubuntu-docs
Suggested packages:
  gnumeric-doc [....] streamer
Recommended packages:
  abiword-help [....] p7zip xli xloadimage
The following NEW packages will be installed:
  libaiksaurusgtk-1.2-0c2a [......] xubuntu-desktop xubuntu-docs
0 upgraded, 85 newly installed, 0 to remove and 0 not upgraded.
[B]Need to get 59.3MB of archives.[/B] [I]//To be downloaded[/I]
After unpacking [B]238MB of additional disk space will be used[/B]. //Disk Expense
Do you want to continue [Y/n]?

Read carefully

It must always tell you the download size AND the disk expense each time you do an apt-get install.

^^ thanks buddy