Life in weeks calculator
Each box is one week and each row is one year of age. Enter your date of birth and the lifespan you want to plan around to see how many weeks you have lived and how many remain on that scale.
Runs in your browser: nothing you enter is sent anywhere.
How to use it
- Enter your date of birth.
- Change the lifespan if you want a grid for more or fewer years than 80.
- Read the numbers above the grid, then look at the boxes. Filled boxes are weeks lived, the highlighted one is this week.
How it works
The number of whole weeks is the number of days since birth divided by 7, rounded down. The grid has one row per year of age with 52 boxes, and the first box of the first row is the week of birth. Row labels show ages 0, 10, 20 and so on.
Worked examples
- Born 15 May 1990, viewed on 3 November 2026: 13,321 days, or 1,903 whole weeks, which is about 46 % of an 80-year grid of 4,160 weeks.
- If you enter a lifespan shorter than your age, all boxes are filled and the tool shows how many weeks you are past it.
Good to know
The point of the chart is perspective, not prediction. Use it as a prompt to plan how you want to spend the weeks ahead.
Frequently asked questions
How many weeks are there in a lifetime?
80 years is 4,160 boxes at 52 weeks a year, which is a little under the true number, about 4,175, because a year has 52 weeks and one or two days. The chart uses 52 boxes per row to keep the rows aligned with years of age.
Is the lifespan a prediction?
No. It is only the size of the grid, 80 years by default. Real lifespans differ by country, sex and health, so choose any number you like, such as 90, to see what a longer life looks like.
How are the weeks counted?
Whole weeks of 7 days from the date of birth to today. Today's week is shown in a different colour. The page uses the date from your device and nothing you enter is sent anywhere.
Can I print the chart?
Yes. Use the print function of your browser. The grid is the part that is printed, so it makes a simple wall chart.