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Age calculator
Calculate your exact age and the days until your next birthday.
As of:
RESULT
- Completed age
- 26 years
- Elapsed time
- 26y 8m 29d
- Next birthday
- 2027-01-01
- Days until birthday
- 93
- Total days since birth
- 9,769
How it works
Age is the number of completed calendar years since birth, followed by additional months and days. Month-end dates are clamped to the last day of the month. February 29 birthdays use February 28 in non-leap years. This is a calendar reference, not a legal age determination.
How to use
- Enter a date of birth.
- Check the completed years, months and days as of today.
- See the next birthday date and the days remaining.
Worked examples and common mistakes
Someone born on October 1, 2000 is 25 on September 30, 2026, and turns 26 on October 1. Subtracting birth year from current year alone overstates age before the birthday. Use the full birth date and check the reference date shown by the tool.
Completed years and elapsed years, months and days describe age differently. Months vary in length, so replacing each month with 30 days may not reproduce the result. For eligibility or enrolment, use the reference date and rules specified by the organisation.
Frequently asked questions
How are leap-day birthdays handled?
In a non-leap year, this tool treats February 28 as the birthday. Other conventions may apply for official purposes.
What happens on the birthday itself?
The age increases and the birthday countdown is zero for that day.