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66 days · keystone habits · free tracker
66-Day Habit Challenge
A well-known study found that new habits take about 66 days on average to become automatic. Three small keystone habits, every day, until they stick.
- Free to start
- No ads
- Works offline
- Android & browser
Why 66 days?
The "21 days to form a habit" idea is a myth. A study from University College London (Lally et al., 2009) followed people building new daily habits and found it took 66 days on average for a habit to feel automatic, with a wide range depending on the person and the habit.
The good news from the same study: missing a day now and then didn't stop the habit from forming. Consistency over perfection.
The three keystone habits
- Move 20 minutes. Easy enough to do on bad days too.
- Read 10 pages. A little every day adds up to many books.
- Plan tomorrow in 2 minutes. Write down tomorrow's top three.
With Momentum Pro you can swap them for your own habits and keep the 66-day structure.
The 66-Day Habit Challenge plan in Momentum
- Move 20 minutesEvery dayAny movement counts. Keep it easy enough to do daily.
- Read 10 pagesEvery dayA little every day adds up to books.
- Plan tomorrow in 2 minutesEvery dayWrite down tomorrow's top three.
Make it yours
Start this plan free, exactly as it is. With Momentum Pro you can shape it to your life, or build your own challenge from scratch:
- Your own habitsAdd, remove or rename habits: a dog walk, a spin class, no coffee after 2 pm.
- How often, per habitEvery day, or 1 to 7 times a week. Strength twice, a class once.
- Your recovery daysChoose how many off days you get, or go strict with none.
- Harder habits count moreIn your own plan, give tough habits up to 10 points so they weigh more in your score.
- Any length30, 66 or 90 days, or ongoing.
- A reminder for each habitEach at its own time, so the nudge comes when it helps.
Why it's easier to stick with
- One tap per habitCheck off as you go. No forms, no fuss.
- See your weekA progress ring and calendar show how you're really doing.
- Miss a day, keep goingRecovery days mean one off day doesn't undo your week.
- Reminders that landA daily nudge, and with Pro a reminder for each habit at its own time.
Questions
- How long does it really take to form a habit?
- About 66 days on average, according to a well-known UCL study, but it varies a lot by person and habit, from a few weeks to several months.
- What if I miss a day?
- Keep going. Missing a single day didn't stop habits from forming in the research, and Momentum's flexible mode gives you recovery days.
- Is the 66-Day Habit Challenge plan free?
- Yes. Starting and tracking any ready-made plan in Momentum is free, in the Android app and in your browser. Momentum Pro adds streaks, levels, your own plans and a reminder for each habit.
- How long does the 66-Day Habit Challenge plan take?
- 66 days, with 3 habits to check off each day.
Day 1 can be today.
Start 66-Day Habit Challenge in a minute. Free to start, no ads.
