Age Calculator
Select your birthdate, month, and year. The calculator will show your exact age in years, months, and days.
Years
Months
Days
Total days
Total weeks
Total months
Age Calculator — Calculate Your Exact Age
The age calculator determines your precise age from your date of birth to today's date. The result is displayed in multiple formats: years, months, and days, as well as totals in days, weeks, and months. Whether you need your exact age for an official form or just for fun, this tool handles leap years and varying month lengths automatically.
How Is Age Calculated?
Age calculation compares two dates — your birth date and the current date (or any target date you choose). The algorithm works through three steps:
- Years — Count full years from birthday to target date.
- Months — Count remaining full months after the last birthday.
- Days — Count remaining days after the last full month.
The calculator accounts for months with 28, 29, 30, or 31 days, and correctly handles February 29 for people born on leap days.
Multiple Output Formats
The calculator shows your age in six different ways:
- Years, months, and days — The traditional exact age
- Total days lived — How many sunrises you have seen
- Total weeks — Useful for pregnancy tracking and fitness plans
- Total months — Handy for subscription and billing calculations
- Next birthday countdown — Days until your next birthday
- Day of the week you were born — A fun trivia fact
Practical Uses of the Age Calculator
Official and legal purposes:
- Verifying age requirements (driver's license, voting, retirement)
- Insurance premium calculations that require exact age
- Legal age verification for contracts and consent
Health and wellness:
- Providing accurate age input for BMI, BMR, and calorie calculators
- Tracking developmental milestones in children
- Checking eligibility for age-specific medical screenings
Everyday fun:
- Finding the exact age difference between two people
- Planning milestone celebrations (10,000 days old, 1 billion seconds)
- Discovering what day of the week you were born
Fun Age Milestones
| Milestone | Approximate Age |
|---|---|
| 1,000 days old | 2 years, 9 months |
| 10,000 days old | 27 years, 5 months |
| 20,000 days old | 54 years, 9 months |
| 1,000 weeks old | 19 years, 2 months |
| 500 months old | 41 years, 8 months |
| 1 billion seconds old | 31 years, 8 months |
| 1 million hours old | 114 years |
Key Age Thresholds in the United States
| Age | Right or Restriction |
|---|---|
| 5 – 7 | Compulsory school attendance begins (varies by state) |
| 13 | Minimum age for most social media accounts (COPPA) |
| 15 – 16 | Learner's permit / driver's permit (varies by state) |
| 16 | Can work without major restrictions (Fair Labor Standards Act) |
| 18 | Legal adulthood, voting rights, military service, sign contracts |
| 21 | Legal drinking age nationwide |
| 25 | Can rent a car without surcharge from most companies |
| 35 | Minimum age to run for President |
| 62 | Early Social Security benefits |
| 65 | Medicare eligibility |
| 67 | Full Social Security retirement age (born 1960+) |
Frequently Asked Questions
How accurate is this age calculator?
The calculator is accurate to the day. It correctly handles leap years (including century rules), different month lengths, and time-zone-independent date arithmetic.
What if I was born on February 29?
The calculator handles leap-day birthdays correctly. In non-leap years, your birthday is typically counted as March 1 for age purposes.
How do I calculate age difference between two people?
Calculate each person's age in days using this tool, then subtract. Or use the Date Calculator to find the exact difference between two birth dates.
What day of the week was I born?
Enter your birth date and the calculator will tell you the day of the week alongside your age.
Related Tools
- Date Calculator — Find the difference between any two dates
- Pregnancy Calculator — Calculate due date and pregnancy weeks
- Days Until Christmas — Countdown to December 25
- Life Calculator — See your life in numbers
- BMI Calculator — Uses your age for health screening