sys db files

I have been sent some information relating to database sizes (i beleive from sys.database_files). Do you know what the information in this table is stored in, is it Mb? I want to covert the size of the DB into Gb, so firstly knowing what it represents would help.
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pma111Asked:
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Vitor MontalvãoMSSQL Senior EngineerCommented:
Did you try to see in MSDN?
All columns are descripted there. The sizes are in 8-KB pages format so you need to use the following formula to get in GB: size * 8 * 1024 * 1024 (KB * MB * GB).
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pma111Author Commented:
Thanks... but that formula cant be right? Arent the last 2 /'s of 1024?
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Vitor MontalvãoMSSQL Senior EngineerCommented:
Sorry. I couldn't understand your question now but I'll try to explain in other words.

The size field stores the number of pages that the file has. In SQL Server is page has 8KB so you need to multiply the number in size field by 8 so you can have the result in KB. Then you multiply it by 1024 (1MB = 1024KB) and after you need to multiply again by 1024 (1GB=1024MB).
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Shaun KlineLead Software EngineerCommented:
No points, just clarifying Vitor's statements:
The data is stored in 8k page files. To convert to GB, you need to divide by 128 (to get to MB) and then divide by 1024 (to get to GB). Another way of looking at it is:
8k_size_page_count * 8 (to get to KB) / 1024 (to get to MB) / 1024 (to get to GB)
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Vitor MontalvãoMSSQL Senior EngineerCommented:
Oh yes, now I understood the pma111 question.
I don't know why I was so focus in the multiplication. Should be division :)

Thanks Shaun for the correction.

So, should be size * 8 / 1024 / 1024 (KB --> MB --> GB).
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Shaun KlineLead Software EngineerCommented:
I owed you one from that TRIM question earlier this week.
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