Habit Tracking Calculator

Track your habit streak, estimate formation progress based on the 66-day rule, and project your consistency over time.

Current streak

days

Total days tracked

days

Days completed

days

Habit difficulty

/10

Time per day

min

Tab to move between fields

Completion rate

80%

Habit formation progress

21%

Days to formation52 days

Automaticity score35/100

Streak resilience83%

Total time invested6 hrs

Projected annual days292 days

Projected annual hours73 hrs

Expected Max Streak3

How to Use This Calculator

Enter your current habit streak (consecutive days without missing).
Input total days tracked since you started and total days you completed the habit.
Rate your habit difficulty (1 = easy, 5 = moderate, 10 = very hard).
Review Completion Rate (%), Habit Strength Score, and estimated days to automatic habit formation.
Use the streak count and strength score as motivation to maintain your daily practice.

How the result changes with Total days tracked

Current streak: Consecutive days you have completed this habit without a break.
Total days tracked: How many days since you started tracking this habit.
Days completed: Total days you completed the habit (including before current streak).
Habit difficulty: 1=trivial (drink water), 5=moderate (exercise), 10=very hard (cold showers).
Time per day: Minutes this habit takes each day.

Completion rate: Percentage of tracked days where you completed the habit.
Habit formation progress: Progress toward automatic habit formation (based on 66-day research, adjusted for difficulty).
Days to formation: Estimated days remaining until the habit becomes automatic.
Automaticity score: How automatic the habit likely feels based on your streak length.
Streak resilience: Estimated probability of maintaining your streak tomorrow.
Total time invested: Total hours you have spent on this habit.
Projected annual days: Days you will complete this habit over a year at current rate.
Projected annual hours: Hours you will invest in this habit over a year.

Identify Input Parameters
4 parameters
Current streak = 14, Total days tracked = 30, Days completed = 24, Habit difficulty = 5 = 5 input(s) provided
Calculate Completion rate
Completion rate = (daysCompleted / totalDaysTracked) * 100
80 = 80
Calculate Habit formation progress
Habit formation progress = min(100, (currentStreak / adjustedFormationDays) * 100)
21 = 21
Calculate Days to formation
Days to formation
52 = 52
Calculate Automaticity score
Automaticity score
35 = 35