Streaks are a good motivator and a bad measurement. They reset to zero on the day you were ill, which means a person who has done something 58 times out of 60 and a person who has done it 9 times both show a streak of nine — and only one of them has a habit.
Free, no sign-up. Worked out in your browser, nothing sent anywhere, and the result imports into EvyOS.
The start date needs to be in the past.
Everything is worked out in this page and saved in this browser only. Nothing is sent anywhere.
From the day you started, including the days you missed. A rate calculated only over the good weeks is not a rate.
One missed day costs almost nothing. Two in a row is where a habit actually breaks.
Formation takes somewhere between two and eight months depending on the habit, and there is no twenty-one-day rule.
The rate is the honest number, and it is almost always higher than people think after a break. What actually matters is not whether you missed a day but whether you missed two in a row, which is the point where the pattern reverts rather than dips.
The formation estimate here is deliberately a range. The often-quoted twenty-one days comes from a plastic surgeon's observation about amputees adjusting to prosthetics and was never a finding about habits at all.
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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