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How can I determine or estimate the size of the SQL dump file prior to using something like mysqldump?

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Please run this query:

SELECT
    Data_BB / POWER(1024,1) Data_KB,
    Data_BB / POWER(1024,2) Data_MB,
    Data_BB / POWER(1024,3) Data_GB
FROM (SELECT SUM(data_length) Data_BB FROM information_schema.tables
WHERE table_schema NOT IN ('information_schema','performance_schema','mysql')) A;

This will give you a ballpark figure. The column index_length is not used because mysqldump does not dump indexes, only data. Just to be safe, you should always gzip it immediately:

mysqldump --all-databases --routines --triggers | gzip > MySQLData.sql.gz

Give it a Try !!!

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