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What is the 21/90 Rule?

According to the 21/90 Rule, you need 21 days to form a habit and 90 days to make it a routine. It's a memorable rule, but the numbers aren't scientifically fixed. Research published in 2009 already showed that forming habits can take very different amounts of time depending on the person and the behavior. Still, consistently repeating something for several weeks can be a useful way to start.

Tips for Applying the 21/90 Rule

To effectively use the 21/90 Rule, it's helpful to keep some strategies in mind. First, set clear goals: Think about exactly what you want to achieve and why. Goal setting gives you direction and helps you stay focused. As I like to say, the key to success is consistency. Integrate the new habit firmly into your daily life and stick to your plan. Self-monitoring also plays an important role. Keep a journal or use an app to track your progress. Additionally, it's important to reward yourself with small treats when you reach milestones. This motivates you and keeps the joy of change alive. Above all, be flexible and willing to adapt your approach if something does not work out as you had hoped.

Examples of Applying the 21/90 Rule

The 21/90 Rule can be applied to many areas of life. For example, if you want to exercise regularly, you could commit to doing a short workout every day for 21 days. After these first three weeks, you set a goal to continue training consistently for the next 90 days to develop a long-term fitness habit.

Another option is calorie counting. If you want to control your diet, you might track your calories for 21 days and keep a food diary. In the following phase, you continue to monitor your calories and work on healthy eating habits to achieve your weight management goals.

It doesn't necessarily have to be fitness-related. If you want to read more, it would be helpful to commit to reading for 20 minutes every day for 21 days. After that, try to maintain that reading time for another 90 days to make reading a solid habit. Or if you want to learn a new language, you could dedicate 30 minutes every day for 21 days and then continue your commitment for another 90 days to deepen your language skills.

My Experience with the 21/90 Rule

I applied the 21/90 Rule to establish my workout routine. Instead of focusing on training in the afternoon, I decided to develop a new habit of working out in the morning before work. To achieve this, I set my alarm for 2:30 in the morning. The first days were intense and required a lot of self-discipline. Waking up wasn't always easy, but the anticipation of the workout kept me motivated. Sure, I have no idea if it was really exactly 21 days, but after about a month, it got easier.

I decided to stick with this routine. After about three months (or 90 days), it became so ingrained that I now wake up at this time without an alarm clock. I've been following this routine for a few years now and it works smoothly without any problems.

Closing Words

The 21/90 Rule can be a useful reminder to stick with something long enough for it to become routine. Just don't assume you've failed if it takes more than 21 or 90 days. What matters much more is keeping at it.