Age Calculator
Calculate your exact age in years, months, days, weeks, hours, minutes, and seconds — live.
Free Online Age Calculator
Our free age calculator lets you find your exact age in years, months, and days, plus your total age in weeks, hours, minutes, and seconds. Simply enter your date of birth and instantly see how old you are — down to the second. The calculator updates in real-time, so the seconds keep ticking.
How to Calculate Your Age
- Enter your date of birth — Use the date picker to select the day you were born.
- Optional: Age at date — Calculate your age as of any past or future date. Defaults to today.
- Click Calculate — Get your exact age in years, months, and days instantly.
- See total units — View your age in total months, weeks, days, hours, minutes, and seconds.
- Next birthday countdown — See how many days until your next birthday.
How Is Age Calculated?
Age is calculated as the difference between two dates: your date of birth and the target date. The calculator counts complete years first (calendar year boundaries), then remaining complete months, then remaining days. For example, if you were born on March 15, 1995, and today is July 25, 2026, your age is 31 years, 4 months, and 10 days.
The total values (weeks, hours, minutes, seconds) are calculated from the exact time difference. One day = 24 hours = 1,440 minutes = 86,400 seconds. One week = 7 days. These totals update live as time passes.
Why Use an Age Calculator?
- Personal curiosity — Find out exactly how old you are in days or seconds
- Eligibility checks — Verify age for voting, driving, retirement, or enrollment
- Birthday planning — Countdown to your next birthday
- Pet age — Calculate your pet's age in human-readable terms
- Anniversaries — Find out how long since an important date
- Legal documents — Quickly determine age as of a specific date
Age Calculation Examples
- Years, months, days — The most common format: "31 years, 4 months, 10 days"
- Total days — "11,440 days old" — great for milestones
- Total weeks — "1,634 weeks old"
- Total seconds — "987,840,000 seconds old" — for fun facts
FAQ
Is this age calculator accurate? — Yes. It accounts for leap years and varying month lengths (28–31 days) for precise results.
Does it account for leap years? — Yes. Leap years are factored into the calculation, so your age is accurate even if you were born on February 29.
Can I calculate someone else's age? — Yes. Just enter their date of birth. No personal data is stored.
Is my data safe? — Yes. All calculations happen locally in your browser. Your date of birth is never sent to any server.