The current encounter builder, page 56 of the Basic rules or somewhere in the DMG, is for newbies. That makes me think: I could recalculate the values on the table and of common monsters —it'd be a good use for the script, although I'd have to write a calculator in JavaScript, which is yucky.
What's the problem with the encounter building guidelines? I mean, they're obviously (very) loose estimates, but do they really give results that are that inaccurate?
Spoiler: Current Games
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Current Live Game: Defenders of Stormfast, "A Brave New World of Adventure" Obsidian Portal Current PbP Game: 5th Edition low-level game ICOOCTrackerMap Current PbP Game: I6 - Ravenloft ICOOC
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I often post from mobile, so feel free to correct any typos.