Record Sizing Calculation

First of all, apologies for using he wrong forum. Why isn't there a "Database" forum?
I am currently trying to size a number of tables for a client. From dim and distant genetic memory I think that the following worse-case calculations apply:
Length of NUMBER column (in bytes) = 1+((max column length)/2)
Length of VARCHAR2 column (in bytes) = 1 + (max column length)
Length of CHAR column (in bytes) = (max column length)
Length of DATE column (in bytes) = 7
Record header length = 3 bytes
So, for a table, if:
N = the number of NUMBER columns
n = the total length of all NUMBER columns
V = the number of VARCHAR2 columns
v = the total length of all VARCHAR2 columns
D = the number of DATE columns
c = the total length of all CHAR columns
Then the maximum record length =
3 + (N+(n/2)) + (V+v) + (D*7) + C
Can anyone confirm this (or suggest the correct formula)?
Also, is the calculation any different for 9i?
Regards,
Tim Fitzpatrick

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