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Life in Weeks Calculator

See your life in weeks: how many weeks you have lived, how many are likely left and what share of an expected lifespan you have used — the memento mori grid in numbers.

Date of birth
Count up to this date
Expected lifespan
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How it works

Weeks lived = ⌊days since birth ÷ 7⌋ · total weeks = ⌊days from birth to birth + lifespan ÷ 7⌋ · weeks left = total − lived · share = lived ÷ total × 100

The “life in weeks” grid, popularized by Tim Urban of Wait But Why, draws one box per week of a 90-year life — about 4,700 boxes. This calculator counts the actual days between your birth date and the chosen date, divides by 7, and compares it with the lifespan you enter. Average life expectancy at birth is about 71 to 73 years worldwide (WHO) and about 78 to 79 in the United States (CDC), but your own expectation rises the older you get.

Worked example

Born June 15, 1995 and counting to October 5, 2026 with an 80-year lifespan: 11,435 days lived = 1,633 full weeks; the 80-year span holds 4,174 weeks, so about 2,541 weeks remain and 39.12% has been lived. Age 31, with 49 summers left.

Sources: Wait But Why — Your Life in Weeks · WHO — Life expectancy at birth · CDC NCHS — Life expectancy

Frequently asked questions

How many weeks are in a lifetime?

About 52.18 weeks per year, so an 80-year life is about 4,174 weeks and a 90-year life about 4,696 weeks. Tim Urban’s famous poster rounds it to 52 × 90 = 4,680 boxes.

How do I calculate how many weeks I have lived?

Count the days from your birth date to today and divide by 7. Someone who is exactly 30 years old has lived 10,957 or 10,958 days, about 1,565 weeks.

What lifespan should I enter?

Use your country’s life expectancy for your age and sex from official life tables. Remaining life expectancy grows with age: a 65-year-old in the US can expect about 18 to 20 more years.

What is the point of seeing life in weeks?

It is a memento mori exercise: a finite, countable number of weeks makes it easier to prioritize what matters. The figure is an estimate, not a prediction.

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This calculator is for educational purposes. Double-check important results before acting on them.