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Life in Weeks
Enter your birth date and see your life as a grid: one row per year, one square per week. Filled squares are the weeks you have lived. Add your own milestones, color the life stages and print it as a poster.
Example shown. Enter your own date.
Weeks lived–
Weeks left–
Your age–
Days lived–
Next birthday–
Age ↓ Week of the year →
Hover or tap a square · click to add a milestone
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How to use the Life in Weeks
- Enter your birth date. The grid updates instantly: every filled square is a week you have already lived, and the highlighted square is this week.
- Pick the length of the grid: 80, 90 (the classic) or 100 years. Optionally add your name for the poster title.
- Add milestones such as graduation, a move or a new job. Give each a date and a color; it shows up as a marked square.
- Explore: hover or tap any square to see the age and exact dates of that week. Turn on life-stage colors for a different view.
- Print or download your life calendar as a poster (Print) or as a PNG image (Download PNG).
How the life calendar is built
Each row is one year of your life, starting on your birthday. Each row has 52 squares, one per week, so a 90-year calendar has 90 × 52 = 4,680 squares. A calendar year is 365 or 366 days, which is 52 weeks plus 1 or 2 days, so the last square of each row is slightly longer than seven days. That keeps every row lined up with your birthday.
- Current row = your age in whole years.
- Current square = full weeks since your last birthday (days ÷ 7, rounded down), from week 1 to week 52.
- Weeks lived = age × 52 + full weeks since your last birthday.
- People born on 29 February have their birthday row start on 28 February in common years.
Life calendar sizes at a glance
| Grid length | Squares (52 per year) | Actual 7-day weeks | Days (approx.) |
|---|---|---|---|
| 80 years | 4,160 | ≈ 4,174 | ≈ 29,219 |
| 90 years | 4,680 | ≈ 4,696 | ≈ 32,872 |
| 100 years | 5,200 | ≈ 5,218 | ≈ 36,524 |
Actual weeks and days use the average Gregorian year of 365.2425 days.
Ideas for using your life in weeks
- Mark the chapters of your life. Add milestones for moves, schools, jobs and the people who mattered. Seeing them on one page often shows how short each chapter really was.
- Turn on life-stage colors to see how much of the grid each phase takes up. The stages are rough age bands for reflection, not official definitions.
- Plan with the future squares. Count the weeks until a goal: a summer is about 13 squares, a school year about 40, a decade 520.
- Print it and keep it visible. Many people colour in one square each week by hand as a weekly habit.
Frequently asked questions
How many weeks are in a 90-year life?
A 90-year life calendar has 90 × 52 = 4,680 squares. Because a year is 52 weeks plus 1 or 2 days, the exact number of 7-day weeks in 90 years is about 4,696, so the grid rounds each year to 52 squares, the same way the original life-in-weeks poster does.
How is the current week calculated?
Each row starts on your birthday in that year. Your current row is your age in whole years, and the square in that row is the number of full weeks since your last birthday (0 to 51). The extra day or two at the end of each year belongs to the last square.
Where does the idea of a life in weeks come from?
The life calendar was popularized by Tim Urban's 2014 essay "Your Life in Weeks" on Wait But Why, which showed a 90-year human life as a grid of weeks. It is often used as a memento mori: a reminder that time is limited and worth spending well.
Is 90 years my life expectancy?
No. 90 years is simply the classic length of the poster. Average life expectancy differs a lot by country, sex and health, so the remaining squares are not a prediction. You can switch the grid to 80 or 100 years.
Is my birth date stored or sent anywhere?
No. All calculations run in your browser. Your birth date and milestones are saved only in your own browser's local storage so they come back next time, and you can clear them with the Reset button.
How do I print my life calendar?
Press Print poster. The page switches to a clean one-page layout with only your title, the grid, the legend and your milestones. Choose portrait orientation; for the sharpest result use Save as PDF in the print dialog.
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