Our very own meryln, wrote a column all about calculating the size and hence download time for a given web page. You can read all about it here, however be aware that it is not complete, as it does not add the weight of a style sheet, nor can it take into account the weight of a image loaded via a style sheet, or ECMA Script call.
I tweaked the code to included linked style sheets, but it still ignores "@import"ed style sheets, and any image loaded via a style sheet or ECMA, as CSS and ECMA isn't parsed by any of the HTML parsers...
Update: NONE of the tools that parse HTML alone will give correct total-page sizes as they all miss scripting (ECMA, JavaScript etc. etc.) and CSS linked assets.
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ajt
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