Your life in weeks

Each dot is one week. A 70-year life comes to about 3,650 of them, few enough to fit on one screen, and that is the unsettling part: a whole life, small enough to take in at a glance.

Filled dots are the weeks you've lived, the highlighted dot is this one, and the hollow dots are what's left if you get the years you chose. Ringed dots mark milestones along the way, like week 1,000 and day 10,000. Switch the grid to months and the same life is 840dots; switch to years and it's 70. Above the grid, a sundial and an hourglass show the same life at a glance: how far the shadow has moved, and how much sand has run through.

Morimantra counts the real calendar days between your birthday and today, leap days included, and divides by seven. The end date is your birthday plus the years you chose, so the total follows the calendar too instead of a flat 52 weeks a year (a year is about 52.18 weeks). Everything is worked out in your browser.

The grid marks round numbers that ordinary calendars skip. Here is the age each one arrives at:

• Week 1,000at 19
• Day 10,000at 27
• Halfway through 70 yearsat 35
• Week 2,000at 38
• Day 20,000at 54
• Week 3,000at 57

Most people pass week 1,000 without noticing. Put in your birthday above and the grid shows which of these are behind you, and when the next one lands.

The calculator starts at 70years: a round number, a little under today's global average. Change it to whatever fits you. Life expectancy differs by country and by sex, and it rises as you get older, because the years you've already lived can't be taken away. Anything from 1 to 150 works. The exact date was never the point; seeing that the supply runs out is.

Memento mori is Latin for “remember that you will die”, an old Stoic habit for deciding what matters today. Drawing a life as a grid of weeks is newer: Tim Urban's 2014 essay Your Life in Weeks made it famous, and Oliver Burkeman named a book after the same arithmetic, Four Thousand Weeks.

Nothing dramatic. Look at this week's dot, pick one thing worth doing before it fills in, and get back to your day. That's the whole practice, and it's the one Morimantra is built around: every new tab shows the time, today's list, a focus timer and a quiet look at the weeks you've got left.

Your birthday stays in this tab. It isn't sent anywhere or stored, and closing the tab clears it. Make a free account if you want Morimantra to keep it for you.