Calculating disk space sold / used?

Hello,

I was sure this would have been asked before but I can't seem to find it, so I'm thinking I must have missed something really obvious.

I have got a fair number of accounts on my server now and I'd like to be able to calculate:

a) The space sold (ie the total of all the quotas)
b) The space used so far (the total of the users files pref. inc. mySQL)

I know I can see what my customers are using through the "list all accounts" function but I need a way to calculate the totals easily.

How does anyone else do it?

Would I need to download the CSV file and import it into a spreadsheet etc or is there an easier way?

TIA

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