example from my system right now: ``````[troy@MacBook-Pro Documents]\$ python mem.py Wired Memory: 2775 MB Active Memory: 5958 MB Inactive Memory: 5078 MB Free Memory: 410 MB Real Mem Total (ps): 11756.645 MB `````` https://apple.stackexchange.com/questions/67031/isnt-inactive-memory-a-waste-of-resources Per this, it seems Free+Inactive for me is 5,488MB out of 16GB - so it's about 1/3rd like the article says is a healthy amount. In Windows they report this very differently - or maybe use memory differently - my current system in windows shows as: ``````Total Physical Memory: 32,438 MB Available Physical Memory: 27,786 MB `````` So just using these 2 things, windows is using 15% of it's memory, but it's probably safe to assume mac is always trying to use 66%+ for efficiency. So for v1 lets go with this; totalmem = 16,000 avail = 5488 ---- 5488/16000=0.343 (34% free, 66% used) usedpercent = 66 So we're going to make a formula to soften this a bit and be a little closer to "windows reality" so that we can use the same counters for both platforms. `109.8591 - (input * 2.453182) + (0.02409091 * input * input)` where `input` is the "usedpercent" ``````[79] pry(main)> input = 66 => 66 [80] pry(main)> 109.8591 - (input * 2.453182) + (0.02409091 * input * input) => 52.88909196 [81] pry(main)> input = 90 => 90 [82] pry(main)> 109.8591 - (input * 2.453182) + (0.02409091 * input * input) => 84.20909099999999 [83] pry(main)> input = 99 ^[[A=> 99 [84] pry(main)> 109.8591 - (input * 2.453182) + (0.02409091 * input * input) => 103.10909090999999 `````` We can add a min 1 and max 100 if that helps