Age Calculator
Calculate your exact age in years, months, days, hours, and minutes. Find out how many days until your next birthday.
Your Age
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How to Use the Age Calculator
Select your date of birth and an optional target date (defaults to today). The calculator gives your exact age down to the day, along with total months, weeks, days, and hours lived.
Next Birthday
The calculator automatically shows how many days remain until your next birthday.
Frequently Asked Questions
- Subtract the birth year from the current year, then adjust for whether the birthday has occurred yet this year. Example: Born March 5, 1990 โ today is April 30, 2026 โ 2026 โ 1990 = 36, and the birthday already passed this year, so age = 36 years old. Our calculator gives the exact result down to days.
- Start with the full years, then count remaining months, then remaining days. Example: Born June 15, 1995 โ today April 30, 2026. Full years = 30. Then from June 15, 2025 to April 30, 2026 = 10 months, 15 days. So exact age = 30 years, 10 months, 15 days.
- Subtract the birth date timestamp from today's date, then divide by the number of milliseconds in a day (86,400,000). For example, someone born on January 1, 2000 has lived approximately 9,600+ days as of 2026. Our age calculator shows total days, weeks, months, and hours.
- Use our calculator by entering a start date as the 'Date of Birth' and an end date in the 'Calculate Age On' field. It will show the exact difference in years, months, days, total weeks, and total days between any two dates.
- Our age calculator automatically shows the number of days remaining until your next birthday. It finds the next occurrence of your birth month and day and calculates the exact day difference from today.
- Total months = (Years ร 12) + remaining months. Example: 30 years and 5 months = (30 ร 12) + 5 = 365 months. The age calculator shows this automatically in the stats breakdown.
- Gestational age is calculated from the first day of the last menstrual period (LMP). Enter the LMP date as 'Date of Birth' and today's date in the second field โ the result in weeks is the gestational age. Normal pregnancy duration is 40 weeks (280 days).
- Legally, a person reaches a given age on the anniversary of their birth date. If born on February 29 (leap day), most jurisdictions recognize March 1 as the legal birthday in non-leap years. Our calculator uses the same standard calendar-based method used in legal contexts.
- Approximate birth year = Current year โ Age. Example: If someone is 36 in 2026, they were born in approximately 1989 or 1990 (depending on whether their birthday has passed this year).