Memento mori calendar: your life in weeks

Memento mori is Latin for “remember that you must die.” The grid is a modern way to see that thought on one screen. Use it the way Marcus Aurelius used the thought: as a reason to act well now, not as a countdown.

How to read your grid

• Each square is one week. Each row is one year of 52 weeks, starting at the top with the year you were born. A small gap after every ten rows marks your decades.
• Filled squares are the weeks you have lived, counted from the first day of your birth month, since the calendar doesn’t ask for the day.
• The bronze square is this week.
• Outlined squares are the rest of the span you chose.

At the default span the grid holds 4,108 squares. A 30-year-old has filled about 1,560 of them. That is all the calendar does: it takes a number you already know in the abstract and lays it out where you can see it. A year runs a day or two past 52 weeks, and the grid absorbs the extra days, so the count is close but not exact.

If you are older than the span, every square fills and no week is marked; move the slider up. The Dark grid (or Light grid) button changes only how the grid looks on this page.

Where 79 comes from

The span starts at 79 because U.S. life expectancy at birth was 79.0 years in 2024, according to the CDC’s National Center for Health Statistics (Data Brief No. 548 (opens in a new tab), January 2026). The same report gives 76.5 years for men and 81.4 for women.

It is an average across a whole population, worked out from one year’s death rates. It is not a prediction for you, and no calendar can tell you how many weeks you have. The average also moves as you age: for people who have reached 65, the CDC’s figure is 19.7 more years, which runs to nearly 85, not 79.

So think of the span as a frame for the picture. Outside the U.S., use the figure your country’s statistics office publishes, or any number you like. The point of the exercise doesn’t depend on it.

What the Stoics did with this thought

The format is recent. Tim Urban drew a 90-year life as a chart of weeks in “Your Life in Weeks,” a 2014 post on his site Wait But Why, and many versions have followed, this one included. The Stoics had no chart. They kept the thought in sentences, and Marcus Aurelius needed only three:

The Meditations were private notes, and this is a reminder Marcus wrote to himself. Set beside your grid, the first sentence names the mistake the open squares invite: treating them as a supply for later. The last sentence is not an order to hurry or to cram more into the weeks ahead. It says to be good “while it is in thy power,” and elsewhere Marcus says what that looks like: doing the task in hand well, as if each act were your last (Meditations 2.5). Here, that means the work, the people, the decision you keep putting off. That is why this calendar marks the present week and counts nothing down.

For what Epictetus and Seneca added, and where the skull-on-the-desk image really comes from, see the memento mori guide. For their lines on time itself, see Stoic quotes about time.

One question for this week

Once your grid is drawn, ask yourself one thing: What have you been promising yourself for later?

It might be the call to an old friend, the visit home, the half-written book, or the apology rehearsed and never made. Seneca took this habit seriously. On the Shortness of Life opens by arguing that life is long enough and that we waste it (chapter 1). In chapter 9 he names putting things off as the worst waste of all. In our words, it gives away today, which is in your hands, for a promise about a future that is in Fortune’s.

Pick one item and give it a day this week, or do its first small piece today. Then close the calendar. This week’s square fills either way; what goes into it is the part that is up to you. At night, the Evening Examination is a good place to check whether you did it.

Print it or make it your wallpaper

The two download buttons under the grid make a PNG image in your browser; nothing is uploaded. Both images carry the line from Meditations 4.17, “While thou livest, while it is in thy power, be good,” with its citation (Marcus Aurelius, translated by George Long, 1862) and this site’s address, so the source travels with the picture.

• Printable poster: a light, portrait image sized for an A4 sheet at 300 dpi, titled Memento mori, with your span written under the title. Print it from any photo app or browser; on US Letter paper, choose “fit to page.”
• iPhone wallpaper: a dark, tall image, 1290 × 2796 pixels, shaped for a modern iPhone screen. Safari saves it to Downloads in the Files app. Open it there, tap Share and choose Save Image, then go to Settings, Wallpaper, Add New Wallpaper, Photos.

The wallpaper is always dark and the poster always light, whatever the grid looks like on screen. Both are pictures of this week, so make a new one now and then: on your birthday, say, or at the start of a season.