On this page is an age in days calculator. Enter your birthday and we'll instantly tell you how many days you've been alive - plus weeks, months, and years. We'll also show your next milestone birthday.
Age in days calculator
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Using the age in days calculator
To find out how many days old you (or anyone) are:
- Birthday: Enter the date you were born.
- Auto-Calculate: Results update instantly as you change the date - no button needed.
The main result shows your age in days. The secondary line shows weeks, months, and years for context. Below that, you'll see your next milestone - when you'll hit a round number of days like 10,000 or 20,000.
(And don't worry, the tool does factor in leap years.)
Day milestones
Some people celebrate milestone day birthdays - hitting a round number of days old is a fun excuse for a party. Common milestones include:
- 1,000 days: Around 2 years, 9 months old
- 5,000 days: Around 13 years, 8 months old
- 10,000 days: Around 27 years, 5 months old
- 20,000 days: Around 54 years, 9 months old
More age calculators
Want to express your age in a different unit? Try one of these:
