One week is noise. Almost everything that feels like a trend in a single week is a bad Tuesday, an unusual meeting load or a cold, and reacting to it produces changes that get reversed the following week. A month is the shortest span where a pattern is distinguishable from weather.
Free, no sign-up. Worked out in your browser, nothing sent anywhere, and the result imports into EvyOS.
Put in four weeks of the same number. Any measure, as long as it is the same one.
Everything is worked out in this page and saved in this browser only. Nothing is sent anywhere.
Any numbers, as long as they are the same four weeks running. Changing them is what makes a month unreadable.
They are different problems. A falling average and a wild one need opposite responses.
Then run it again next month. Changing three makes the next month uninterpretable.
This takes four weeks of the same handful of numbers and does what a person cannot do reliably by eye: separates the direction from the variation. A declining average matters; a stable average with enormous swings is a different problem entirely and needs a different fix.
The variance finding is the one people never reach on their own. Consistency usually beats intensity, and a month with one heroic week and three poor ones almost always totals less than four ordinary ones.
This works something out and then forgets it. It cannot tell you whether the number moved, because it has no memory of the last time you ran it and no idea what you did in between. Every calculator on the internet has that limit, and if it has never bothered you then this one is yours for free for good.
EvyOS is the same structure with the work recorded against it. Send the result across and it becomes real goals, tasks or habits with their dates — then the next answer is computed from what actually happened rather than from what you remember typing.
Goals, projects, tasks, habits and skills in one system, with the work logged against what it belonged to.
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