Age Calculator — Calculate Your Exact Age in Years, Months and Days
Find out your exact age down to years, months, days, hours, and a live seconds counter. Includes next birthday countdown with day-of-week, zodiac sign, Chinese zodiac, and age comparison between two people.
100% private. All calculations run in your browser. Your date of birth is never sent to any server.
How to Calculate Your Exact Age
- 01
Enter your date of birth
Select your birth date using the date picker. The maximum selectable date is today.
- 02
Set the reference date
Choose the date to calculate age as of. Defaults to today. Use presets for your next birthday or New Year 2026.
- 03
View your exact age
See your age in years, months, and days. Explore total weeks, days, hours, and a live seconds counter. Check your zodiac sign and next birthday countdown.
Frequently Asked Questions
How does the age calculator count days and months?
The calculator uses calendar-accurate month counting. It starts from your birth date and counts completed years, then remaining months, then remaining days. February and months with 30 days are handled correctly — a person born on March 31 will have their "month" complete on April 30 (the last day of April), not April 31.
Why does the seconds counter keep ticking?
The live seconds counter increments every second in real-time using your browser's clock. It shows the total number of seconds since your birth date as of the current moment. This resets when you change the "calculate as of" date to a fixed date.
How accurate is the zodiac sign calculation?
The zodiac sign is determined by your birth month and day using standard Western astrology dates. For example, Aries runs from March 21 to April 19. The exact cusp dates can vary by a day depending on the year, so if you were born on a cusp day, the sign may differ from some sources.
What is the "Calculate age as of" date for?
This lets you calculate age at any point in time — past, present, or future. For example, you can find out how old you will be on New Year's Day 2030, or verify how old someone was on a specific historical date. The default is today's date.
How does the age comparison mode work?
Age comparison mode takes two dates of birth and calculates the exact difference between them. It shows who is older and by how many years, months, and days. This is useful for comparing ages between family members, friends, or historical figures.