The goal of this calculator is to get a low number or a high number?
I dunno I ran it on a few 1v1 games I had and there was very different levels of macro being employed. The player that won out macro'd and stomped the other, however had more workers and more avg unspent... their SQ scores were similar.
The sum doesn't seem like it considers enough variables to be accurate.. like time and workers... but then you got to factor in harrasment causing lower worker counts at varied points in time. As for example, the first game with 501 unspent and 1731 avg income meals totally different things if the game length was 17 mins... or 37 mins. and will cause a significant difference to the macro in game.
That being said, I don't feel that I know enough about the formula to really make an assessment.. but i'll probably look into it soon..
The goal of this calculator is just for calculating your SQ. Your goal to "macro like a pro" can be translated as having a high SQ.
The length of your game wouldn't really matter, as long as it's "long enough" and it's a normal game (I wouldn't call it normal if you have 10k mineral and 200/200 food for like 5 minutes - if you know what I mean). What really matter is your AI (Average Income) and your AUR (Average Unspent Resource)
As the example I gave above, the more bases you have, the more AI and the harder it is to maintain a lower AUR.
Hence, while in the 2nd game, my AI is only twice as much, and my AUR is tripled, I still have a better - higher SQ.
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