Calculate an age from a date of birth
Years, months and days, the next birthday and the zodiac year, for as many dates as you paste.
Output
Paste or type above to see the result here.
Your files stay on your device
This tool runs entirely in your browser. What you paste is processed on your device and is never sent to a server, so it is safe to use with tokens, keys and unpublished text.
How it works
- Type or paste dates of birth, one per line.
- Dates can be written 1990-04-01, as your language writes them, or as a Japanese era date such as Heisei 2.4.1.
- To know an age on another day, such as a deadline or a trip, choose it in Age on.
- Each line shows the age in years, months and days, the zodiac year and the days to the next birthday.
Frequently asked questions
- How are months and days counted?
- A month is reached on the same day of the month as the birth, or on the last day of a shorter month: someone born on 31 January has reached one month on 28 February. The days are those since the last month was reached.
- What about someone born on 29 February?
- In years without one, the age changes on 1 March in this calculator, which is also how most countries treat it for everyday purposes.
- Is my date of birth sent anywhere?
- No. The calculation runs in your browser.
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