Life Calendar

How the grid is worked out

The grid is fifty-two boxes across for each year of the life expectancy you enter, so the total is that expectancy times fifty-two. Weeks lived is the milliseconds between your date of birth and now, divided by the milliseconds in a week and rounded down; weeks remaining is the total minus that, floored at zero. Life expectancy is clamped between 1 and 120 years, because a grid for 500 years is not a picture of anything.

Fifty-two is the deliberate simplification and it is worth stating plainly. A year is 52.18 weeks, so the grid runs about a fifth of a week short per year and roughly fourteen weeks short across an eighty-year life. The alternative is a ragged grid where the row breaks wander, which destroys the only thing the picture is for. Every guide line on it — a marker every thirteen columns for the quarters, a year label every five rows — is there to make it countable rather than to make it precise.

The expectancy figure is yours to set. The tool ships a starting number and does not look up an actuarial table for your country, your sex or your health, and it should not be read as a prediction about you: a period life expectancy is a population average for babies born now, not a forecast for a specific adult. The grid is drawn in this page and a reload starts it over.

Nothing on this site is medically reviewed. Every figure above was read out of the code that runs on this page, and where a number is our own judgement rather than a published one, the note says so and cites nothing. Method last checked 21 August 2026.