A lifetime, one sunrise at a time
How many days have I been alive?
Enter your birthday and see your age as a stack of days, weeks, hours, and satisfying milestones.
Private by default. Your birthday stays in this browser and is never sent to RoutineSum.
Your running total
—days aliveBehind the number
Simple date math, made memorable.
RoutineSum counts complete calendar days from your birth date through today. That naturally includes leap years. Hours are the day count multiplied by 24, so they are a readable calendar estimate rather than a record of daylight-saving clock changes.
Questions people ask
How is my age in days calculated?
We compare your birth date with today using calendar dates, then divide the difference by the length of a day.
Does it include leap years?
Yes. Every February 29 between the two dates is included automatically.
What happens if I was born on February 29?
The day total stays exact. For the next-birthday countdown on a non-leap year, this page uses February 28.
Is my birthday saved?
No. This tool calculates locally in your browser and does not submit your date.