Age Calculator + formulas
Calculate your exact age with advanced metrics: decimal years, dog years, cat years, and see the formulas behind every number.
How It Works
Enter Your Birth Date
Simply input your date of birth. Optionally add birth time for precision.
Compare Dates
Choose any comparison date (default today).
Detailed Results
Get years, months, days, seconds, plus dog years, cat years, and formulas.
More About Your Age
Moon Phase at Birth
Discover what the moon phase was on the day you were born.
Birth Day Facts
Interesting facts about the day you were born.
Why Use Our Age Calculator?
Knowing your exact age is more than just a number—it’s essential for medical checkups, legal documentation, retirement planning, and even fun facts. Our age calculator goes beyond simple year counting. It provides a comprehensive breakdown in years, months, days, hours, minutes, and seconds. You can also compare your age to any past or future date, making it perfect for anniversary countdowns, eligibility checks, or simply satisfying your curiosity.
The tool uses the Gregorian calendar and accounts for leap years automatically. Unlike many online calculators that only give approximate results, our engine calculates down to the millisecond. You can even include your exact birth time for ultra‑precise results—ideal for astrological purposes or if you need to know your age to the second.
🔍 What makes this calculator different?
- Decimal age: See your age as a precise decimal (e.g., 27.34 years) for financial or scientific use.
- Dog & cat years: Fun approximations based on common veterinary guidelines.
- Zodiac sign & moon phase: Instant astrological insights at birth.
- Next birthday countdown: Days, hours, and minutes until your special day.
- Life percentage: How much of an average lifespan (79 years) you’ve already lived.
🎯 Common use cases
• Medical & health: Doctors often ask for exact age in months for infants, or in years for medication dosages.
• Legal age verification: Check if someone meets the minimum age for driving, voting, or retirement.
• Event planning: Calculate how many days until a milestone birthday or anniversary.
• Genealogy & history: Determine the precise age of ancestors at important historical events.
• Just for fun: Share your age in seconds with friends or see how your age compares to your pets in “their years.”
❓ Frequently Asked Questions
Q: Is the calculator accurate for leap years and time zones?
Yes. The calculator uses your local time zone and correctly handles February 29. For the most accurate results, ensure your device’s date and time are set correctly.
Q: Can I calculate the age of someone who has already passed away?
Absolutely. Just enter their birth date and the date of death as the “Compare To” date. The tool will show their exact age at the time of passing.
Q: Why do dog/cat years formulas differ?
Different sources use different approximations. We’ve adopted a widely accepted method: first two dog years = 10.5 each, then 4 per year; cat years: first year = 15, second = 9, then 4 per year. This gives a reasonable estimate for adult pets.
Q: Do I need to enter birth time?
No, it’s optional. If you omit it, the calculator assumes 00:00 (midnight) on your birth date. Adding time refines the seconds and improves accuracy for next‑birthday countdowns.
Disclaimer: Finance ToolBajar’s age calculator is provided for informational and entertainment purposes only. While we strive for accuracy, we cannot guarantee that the results are suitable for legal or medical decisions. Always consult a qualified professional for critical age‑related matters.