By Dan Remon · Evidence checked October 2026
You don’t need more time for new habits. You need better anchors.
Your day already runs on routines you never think about. The alarm, the first coffee, the walk to the car, the laptop opening, the last meeting. Each one happens whether you feel like it or not, and each one is a hook you can hang a new behaviour on.
That’s habit stacking. It’s the simplest way I know to add a habit to a full diary without adding a decision, and the research behind it is stronger than the name suggests.
What is habit stacking?
Habit stacking means attaching a new habit to something you already do every day, in the form “after I [current habit], I will [new habit]”. After I pour my first coffee, I write my 3 priorities. The existing routine becomes the trigger, so you don’t have to remember, find time or decide. The science underneath it combines 2 ideas: if-then plans, which psychologists call implementation intentions, and repetition in a consistent context, which is how a behaviour becomes automatic. It works best with small actions and anchors that happen every day, including when you travel.
Why habit stacking works
3 findings explain it.
An if-then plan beats a good intention
A habit stack is an if-then plan with an anchor you can’t miss. The research form is “if situation Y happens, then I will do X”. Pooled across 94 independent tests, these plans had a medium-to-large effect on goal attainment (d = 0.65).1 I’ve written about using them to plan a working week in a productivity system that survives a bad week, so I’ll keep this short. A stack is the same idea applied to one habit.
The new habit goes after the anchor
Order matters. In a small exploratory study, 50 people were asked to start flossing, half before brushing their teeth and half after.2 Those who flossed after brushing tended to form stronger habits, and 8 months later they had stronger habits and flossed more often. Brushing was the anchor. The new habit held better at the end of the routine than squeezed in front of it.
That’s why every stack below starts with “after”.
The cue does the remembering
As a behaviour is repeated in the same setting, control of it shifts to cues in that setting, and it starts to run with less thought.3 A fixed anchor gives you the same cue every day, at home or in a hotel room. Your memory and your mood stop being part of the system.
How long does it take to form a habit?
Longer than the 21 days you’ve heard. In a study at University College London, 96 volunteers picked one eating, drinking or activity behaviour and did it daily in the same context, such as “after breakfast”, for 12 weeks.3 For the 39 people whose data fitted the researchers’ model well, the median time to reach 95% of their peak automaticity was 66 days. The range ran from 18 to 254 days.
2 more findings matter if your diary is full. Missing one opportunity to do the behaviour did not materially set the habit back. And about half the participants didn’t do their behaviour consistently enough to reach habit status, even though they had volunteered to build one.
So plan for 2 to 3 months, not 3 weeks. Treat a missed day as data and run the stack the next day instead of restarting from zero. And keep the stack small enough that doing it every day is realistic, because repetition is what the habit is built from.
Habit stacking examples for a leader’s day
Every stack below follows the same pattern: a fixed anchor, then one small action. Pick one to start. Habits work best when they serve a target, so if you haven’t set one for this quarter, start with goal setting that survives the quarter.
Morning
- After I turn off my alarm, I drink a large glass of water before coffee.
- After I pour my first coffee, I write the 3 things that matter today.
- After I sit down at my desk, I do one 30-minute focused block before opening email.
During the workday
- After each meeting ends, I write down the decision, the owner and the deadline before I open anything else.
- After I step onto the BTS or into the back of the car, I reread my 3 priorities before I check messages. In Bangkok traffic, that anchor shows up twice a day.
- After I sit down for lunch, I put my phone face down until I’ve finished eating.
Evening
- After my last meeting, I walk for 10 minutes.
- After I close the laptop, I write tomorrow’s first task on paper.
- After I brush my teeth at night, I put my phone on charge outside the bedroom.
That last one is as much an environment change as a habit. Environment is one of the 6 areas I cover in self-leadership.
Travel days
- After I check into the hotel room, I put my training kit out before I open the laptop.
- After I sit down on the plane, I set my watch to the destination time zone.
How to build a habit stack that holds
- Start tiny. Start with a version you’d do on your worst day: 1 glass of water, 1 line in the notebook, 10 minutes of walking. Grow it once it runs without thinking. It’s the minimum effective dose applied to habits.
- Pick a fixed anchor. Something that happens every day, in the same place, even when you travel. “When I have time” is not an anchor. Neither is the gym if you don’t go every day.
- Put the new habit straight after the anchor. Not before it, and not an hour later. The end of one routine is the cue for the next.
- Stack one at a time. Add the next habit when the first runs on its own. One stack held for 2 months is worth more than 5 started on a Monday.
- Track it. A tick on paper is enough, as long as it happens every day.
The system survives the version of you that’s tired.
Track your stack in 60 seconds
Tracking turns a stack from a hope into a record, and the evidence for it is solid. A 2016 meta-analysis of 138 randomised studies with 19,951 people found that prompting people to monitor their progress improved goal attainment (d = 0.40), with larger effects when progress was physically recorded.4
The tool I use is the Stealth Tracker, a 60-second daily check-in on your phone. For a habit stack, it records one thing: whether the stack ran today. Logged every day, that becomes a record you can read. You’ll see which anchors hold on travel days, which ones break on a heavy Monday and how many days the stack has run since you started.
Review that record once a week. If the stack keeps missing, it’s too big or the anchor isn’t fixed. Shrink it or move it, and keep going.
How to start
Pick one stack from the list above and run it tomorrow. Then find out where your next one should go.
- The 1% Scorecard. 8 questions, 2 minutes, free. You get a score out of 100 across 6 pillars and the one thing to install first, which tells you where a new stack will do the most good.
- The Quest. The performance membership. You install one change per 28-day cycle inside the Stealth OS, with a room of founders running the same system. Cancel anytime.
Pick the anchor tonight. The stack starts tomorrow.
Related reading: Productivity coaching for founders: install a system, 10 tips to boost productivity: how to be more productive and 5 systems for intentional focus and action.
FAQ
What is an example of habit stacking?
After I pour my first coffee, I write the 3 things that matter today. The coffee is the anchor you already have and the list is the new habit. Other examples: after I sit down at my desk, I do one focused block before email, and after I brush my teeth at night, I charge my phone outside the bedroom.
How long does habit stacking take to work?
In a UCL study of people building one new daily habit in a fixed context, the median time to reach 95% of peak automaticity was 66 days for those whose data fitted the model well. The range was 18 to 254 days. Plan for 2 to 3 months, not 3 weeks.
Does habit stacking work?
The pieces behind it are well studied. A meta-analysis of 94 tests found that if-then plans had a medium-to-large effect on reaching goals (d = 0.65), and habit research shows that repeating an action in a consistent context makes it more automatic. A small study also found a new habit formed more strongly when it came after an existing routine rather than before it.
What happens if I miss a day of a new habit?
Very little. In the UCL study, missing one opportunity did not materially affect the habit formation process. Run the stack the next day and keep going instead of starting over.
Sources
- Gollwitzer, P. M., & Sheeran, P. (2006). Implementation intentions and goal achievement: A meta-analysis of effects and processes. Advances in Experimental Social Psychology, 38, 69-119. doi.org/
10.1016/ S0065-2601(06)38002-1 - Judah, G., Gardner, B., & Aunger, R. (2013). Forming a flossing habit: An exploratory study of the psychological determinants of habit formation. British Journal of Health Psychology, 18(2), 338-353. doi.org/
10.1111/ j.2044-8287.2012.02086.x - Lally, P., van Jaarsveld, C. H. M., Potts, H. W. W., & Wardle, J. (2010). How are habits formed: Modelling habit formation in the real world. European Journal of Social Psychology, 40, 998-1009. doi.org/10.1002/ejsp.674
- Harkin, B., Webb, T. L., Chang, B. P. I., Prestwich, A., Conner, M., Kellar, I., Benn, Y., & Sheeran, P. (2016). Does monitoring goal progress promote goal attainment? A meta-analysis of the experimental evidence. Psychological Bulletin, 142(2), 198-229. doi.org/10.1037/bul0000025
This article is general information, not medical advice.
