Exact age and days until your next birthday.
Free to use, no sign-up required. Age Calculator is one of 198 tools built into Xenition, alongside a chat that can use them for you.
Gives your exact age in years, months and days from your date of birth, and how many days remain until your next birthday.
Years, months and days are counted by calendar subtraction. When the day of the month has not yet been reached, one month is borrowed and the length of the previous calendar month is added to the days. Next birthday counts whole calendar days from today to your birthday this year, or next year if it has passed.
Someone born on 15 August 1990, checking on 27 September 2026, is 36 years, 1 month and 12 days old, with 322 days until their next birthday.
Months have 28 to 31 days, so “1 month and 12 days” is counted from real calendar months, not from a fixed 30-day month.
In years without 29 February, the date rolls over to 1 March, so the countdown to your next birthday runs to 1 March in those years.
You do not have to open Age Calculator to use it. Ask Xenition in plain language and it runs the right tool, then carries the answer into whatever you are working on — a document, a spreadsheet, a deck.