Habit Tracker (Streak Calculator)
Track a habit’s current streak, longest streak, and consistency rate over a given window.
Inputs
Current streak
—
Completion rate
—
Days missed
—
Next milestone
—
Expected next month
—
About Habit Tracker (Streak Calculator)
How long to form a habit
Phillippa Lally’s research (2010) found a range of 18-254 days, with an average of 66. "21 days" is a myth. The right number depends on the habit and the person.
Don’t miss twice
James Clear’s "Atomic Habits" rule. One miss is an accident; two in a row is the start of a new (bad) habit. If you slip, get back on the next day.
Make it easier
Lower the activation energy: clothes by the bed for running, book on the pillow for reading. The smaller the habit, the higher the consistency rate.