See your life
in months.
Enter your birthday. Each box is one month of an 80-year life — twenty-four across, two years to a row. The orange ones are gone; the one still burning is this month.
Stays on this page. Nothing is sent anywhere.
What is a life in months calendar?
A life in months calendar is a chart with one box for every month of a life — 960 boxes for eighty years — so a whole lifetime fits on a single page. You fill in the months behind you and see, at a glance, what remains.
It’s the coarser cousin of the life in weeks grid that Tim Urban’s “Your Life in Weeks” and Oliver Burkeman’s Four Thousand Weeks made famous. Fewer boxes, each one heavier — a month is long enough to hold a move, a season, a whole chapter.
How many months
are in a life?
About a thousand. An 80-year life is 960 months — twelve for every year, the number this page draws. Tim Urban’s 90-year chart runs to 1,080. Either way it’s a number you can say out loud, which is exactly what makes it land.
Nine hundred sixty boxes: enough to feel like a life, few enough to fit in one glance.
give or take — the three spans are the whole grid
Your life in months, by age
Every year of life is 12 boxes. At forty, the 80-year grid is exactly half full — 480 months gone, 480 to go.
| Age | Months lived | Months left |
|---|---|---|
| 18 | 216 | 744 |
| 25 | 300 | 660 |
| 30 | 360 | 600 |
| 40 | 480 | 480 |
| 50 | 600 | 360 |
| 60 | 720 | 240 |
| 70 | 840 | 120 |
| 80 | 960 | 0 |
whole 12-month years — the calculator above counts yours to the month
Months, or weeks?
The same 80 years is 960 months or 4,160 weeks. Months are the wide shot — the whole life legible at once, every box a chapter. Weeks are the close-up: small enough that this one, the one you’re in, is visibly burning. One Last Second’s app draws the weeks version, one three-second video at a time.
See your life in weeks→Keep the grid.
Fill it in.
This grid lives in One Last Second — a 3-second daily video journal. The app draws the finer version, your life in weeks, and fills it with the real thing: film one three-second moment a day and the boxes stop being empty.
A countdown to midnight, and whether you showed up today.
Every month stitches itself into a small film of your moments.
Old days resurface a month, six months, a year later.
No feed, no strangers. Your moments stay yours.
The same grid, always one tap away.
How does the life in months calculator work?
Enter the day you were born and the grid fills in — one box for every month you’ve been alive, out of the 960 months in an 80-year life. Everything is computed by your browser on your own device. Your birthday never leaves the page; it’s saved only in your browser so the grid is still filled in next time.
How many months are in 80 years?
960 months — twelve for each of eighty years. Tim Urban’s original 90-year chart runs to 1,080 months. Counted in days it’s the same life either way: about 29,220.
How many months has the average person lived?
Around 360 — the average person alive today is roughly thirty years old. A completed life at the world-average expectancy of about 73 years is roughly 876 months. At forty you’re at 480, exactly half the 80-year grid. The calculator above counts yours to the month.
Should I count my life in months or weeks?
Months are the calmer lens: 960 boxes you can almost take in at once, each one big enough to hold a season of your life. Weeks are the finer instrument — 4,160 dots, one per week, which is the version the One Last Second app draws. Try both; they tell the same story at different volumes.
Open the weeks calculator →Why 80 years?
It’s the horizon One Last Second draws — a round eighty years, close to a full life expectancy. The grid is a horizon, not a prediction: some people get more rows, some fewer. The point isn’t precision; it’s that the number of boxes is finite, and visibly so.
Can I keep my grid?
Yes — it lives in One Last Second, a free iPhone app built around this grid at its finer, weekly grain. Film one 3-second video a day and the boxes stop being empty: each one holds real footage of the life you were living. The app is free on the App Store.
Get the app →iOS, out now. Three seconds before midnight — that’s the whole ask.
Three seconds a day — free on the App Store