Habit Consistency Calculator
Estimate your probability of sticking with a habit for 30 or 90 days. Then get the plan to make it stick.
Biggest Friction
3 adjustments to raise your probability
Your 7-Day Consistency Plan
What This Habit Consistency Calculator Measures
This calculator estimates how likely you are to maintain a habit over 30 or 90 days. It uses six inputs that behavioral research has shown to be the strongest predictors of habit survival.
- Session size determines how much activation energy you need each time. Smaller is almost always better at the start.
- Frequency sets the rhythm. Too much too soon kills habits before they root.
- Difficulty captures the skill and effort gap. Hard habits need different strategies than easy ones.
- Environment measures whether your space supports the habit or works against it.
- Trigger clarity determines whether your habit has a reliable cue or depends on willpower.
- Time of day adjusts for when willpower is highest and when it drops.
Why Most Habits Fail in Week One
The most common reason habits fail is not motivation. It is friction. The habit is too long, too frequent, too hard, or too dependent on willpower. Most people design habits for the best version of themselves on the best day of the week. But habits need to survive the worst days too.
Research from the British Journal of General Practice shows that habits take an average of 66 days to become automatic. The first 7 days determine whether you survive to day 66 or not. If you cannot do it on day 3 when you are tired and busy, the plan is wrong.
This calculator identifies where your plan is weakest and gives you specific adjustments to increase your probability of getting past week one.
The Three Levers That Increase Consistency Fast
If your probability is below 70%, focus on these three levers before anything else.
- Shrink the session. A 2-minute habit done daily beats a 30-minute habit done once. The goal is to make starting so easy that skipping feels harder than doing it.
- Set a clear trigger. "After I pour my morning coffee, I will read 1 page." This format (after X, I will Y at Z) has been shown to double habit follow-through in implementation intention studies.
- Shape the environment. Put the book on the coffee table. Put the running shoes by the door. Remove the phone from the bedroom. Your environment should make the right action the default action.
What to Do Next: Your 7-Day Consistency Plan
After calculating your probability, scroll down to your personalized 7-day plan. Each day gives you one setup action, one execution rule, and one mirror prompt. The plan is designed around your biggest friction driver.
If your friction is session size, the plan focuses on shrinking and stacking. If your friction is environment, the plan focuses on setup and obstacle removal. If your friction is trigger clarity, the plan teaches you implementation intention and cue design.
You do not need to be perfect. You need to be consistent. Run the 7-day plan, then recalculate. Your probability will move.
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