Glossary
Habit stacking, explained
Habit stacking is attaching a new habit to one you already do every day: "after I pour my morning coffee, I write tomorrow's plan". James Clear popularised the term in Atomic Habits (2018), building on BJ Fogg's "anchor" idea from Tiny Habits.
What it means
Existing routines are reliable cues. By chaining the new behaviour to one, you skip the need to remember it; the old habit reminds you.
How to do it in a calendar
- Pick an anchor that happens every day at about the same time.
- Put the new habit right after it as a short block.
- Keep the new habit small at first (5 to 15 minutes).
An example
After lunch (the anchor), a 15-minute walk. In Cutline: lunch at 12:00, "Walk 15 min" at 12:30 every weekday, ticked off when done.
Common mistakes
- Vague anchors. "In the morning" is not an anchor; "after I brush my teeth" is.
- Stacking too much at once. Add one habit, then the next.
Where it comes from
James Clear, Atomic Habits (2018); BJ Fogg, Tiny Habits (2019); Lally et al., European Journal of Social Psychology (2010).
Questions
How long until a stacked habit is automatic?
In one well-known study, habits took a median of 66 days to become automatic, with a wide range from 18 to 254 days (Lally et al., 2010).
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