Does this calculate leap years correctly?

Yes. Our algorithm accounts for every leap day (February 29th) that has occurred since your birth year to ensure the day count is 100% accurate.

Can I calculate someone else's age?

Absolutely. You can use this to find out the age of historical figures, celebrities, or family members. Just enter their birth date.

How do I calculate age on a future date?

Change the 'Age at the Date of' field to any future date. This is useful for seeing how old you will be at the turn of the next century or on your retirement date.

Age Calculator | Calculate Exact Age from Date of Birth | Finmato

More Than Just a Number

We usually answer the question "How old are you?" with a single integer. "I'm 32." But that simplifies the rich complexity of time. You aren't just 32; you are 32 years, 4 months, 12 days, and (crucially) 6 hours old. Our Age Calculator peels back the layers of the calendar to give you a precise understanding of your chronology.

Why Precision Matters

Knowing your exact age isn't just trivia; it's useful for legal, financial, and personal planning.

Legal Milestones

Most legal rights (voting, driving, drinking, renting a car) activate on a specific day. Being "almost 18" is very different from being 18 years and 1 day.

Retirement Planning

Social Security and 401(k) withdrawals often depend on half-years (e.g., age 59 ½). Calculating this manually with leap years is tricky.

The Leap Year Problem

Why can't you just subtract 2024 from your birth year? Because the Earth takes 365.2422 days to orbit the sun.

Every 4 years, we add a day (February 29th) to stay in sync. If you are 40 years old, you have lived through roughly 10 extra days that simple subtraction ignores. Our calculator accounts for:-

Standard Leap Years (every 4 years).
Century exceptions (years like 1900 were not leap years, but 2000 was).
Varying month lengths (30 vs 31 days).

Baby Milestones

For infants, age is measured in weeks and months. "14 months old" conveys development stages better than "1 year old."

Event Planning

Find out exactly when your "Golden Birthday" is (turning the age of your birth date) or calculate when you will be 10,000 days old.

Wedding Anniversaries

Input your wedding date instead of a birth date to see exactly how long you have been married.

Frequently Asked Questions

How precise is the "hours" calculation?

Since we don't ask for your time of birth (only the date), the hour calculation assumes you were born at midnight (00:00). It gives you a "start of day" estimate.

What is the Korean Age system?

In South Korea (traditionally), you are 1 year old the day you are born, and you gain a year every New Year's Day. This calculator uses the International Standard (starting at 0).

Can I calculate age difference?

Yes! Open the calculator in two tabs. Calculate Age A and Age B, then compare the "Total Days" output to see the exact gap between two people.

Time Zones

Calculations are based on the user's local device time. Traveling across time zones may shift the "current date" and affect the result by +/- 1 day.

Data Privacy

We do not store your birth date. This tool runs entirely in your browser.

Age Calculator