Age calculator
Calculate your exact age from your date of birth. Results show years, months, days, hours, and other time units instantly.
What is the Age Calculator?
The age calculator tells you exactly how old you are, down to the day. Enter your date of birth and it shows your age in years, months, and days — plus the total number of days you've been alive, the day of the week you were born, and how long until your next birthday.
How does age calculation work?
The calculation subtracts your birth date from the reference date, accounting for varying month lengths and leap years. You're 29 years and 11 months old until the exact day of your 30th birthday, at which point you become 30. This matches how most countries, schools, and government forms define age for official purposes.
When should you use an Age Calculator?
Age calculators come up in school admissions (where "age as of a specific date" is the official metric), immigration and visa forms, sports eligibility rules, retirement planning, and the occasional curiosity about how many days you've been alive. If you're filling out a form, expand the "calculate as of a different date" option and set it to the application's cutoff date.
Common Uses
- Passport and visa applications: Many countries require exact age verification at the time of travel or application — calculate your precise age to the day.
- Retirement planning: Determine how many years, months, and days remain until your target retirement age so you can plan contributions accurately.
- Child development milestones: Pediatricians track developmental milestones by month — calculate a child's exact age in months for growth chart comparisons.
- Health screening eligibility: Many preventive screenings (mammograms, colonoscopies, bone density scans) are recommended at specific ages — verify your eligibility instantly.
- Legal age verification: Confirm voting eligibility, drinking age compliance, or driving licence qualification with a precise date-based calculation.
- Leap year birthdays: People born on February 29 often need to know their legal age for non-leap years — the calculator handles this edge case correctly.
- Academic admission cutoffs: Schools and universities often require students to be a certain age by a specific date — verify cutoff compliance before applying.
- Insurance premium estimation: Life and health insurance premiums are age-banded — knowing your exact age helps you compare the right quotes.
FAQ
How is my exact age calculated?
The calculator subtracts your date of birth from today (or a date you choose), accounting for different month lengths and leap years. The result shows your age in complete years, months, and remaining days.
What happens if I was born on February 29?
In non-leap years, your birthday is treated as March 1 for calculation purposes. In leap years, February 29 is used as normal.
Can I calculate my age as of a specific date?
Yes. Click "Calculate as of a different date" and enter the date you need. This is useful for school admissions, visa applications, or any form with a specific cutoff date.
Is my birth date data stored anywhere?
No. The Age Calculator runs entirely in your browser. Your birth date is never sent to any server and is not stored in cookies or local storage. When you close the tab, no trace of your data remains anywhere outside your own device.
How accurate is the Age Calculator?
The Age Calculator is precise to the second when you enter a time of birth. Without a time, it calculates age in whole days at midnight. The calculation correctly accounts for all month lengths, leap years, and the Gregorian calendar. It matches the age calculation method used by most government forms, school admissions, and official documents worldwide.
By the Numbers
- Global average life expectancy is 73.3 years (WHO, 2024)
- Japan has the world's oldest population with a median age of 49.5 years (UN World Population Prospects, 2024)
- A person aged 65 today has a 50% chance of living to age 85 (U.S. Social Security Administration)
- Approximately 5 million people worldwide share a February 29 birthday — about 1 in every 1,461 people