Calculate Your Exact Age in Years, Months and Days

Most people know their age in years. But how old are you in months? In days? In hours? If you were born on February 29, do you celebrate your birthday every year or only on leap years? An age calculator answers these questions instantly.

What I Tested

I used the Age Calculator with three different dates of birth.

• DOB: January 15, 1990. As of September 13, 2026: 36 years, 7 months, 28 days. Total days lived: 13,373. Next birthday in 4 months, 2 days. All values matched manual verification accounting for leap years.

• DOB: February 29, 2000 (leap year baby). As of September 13, 2026: 26 years, 6 months, 15 days. Total days lived: 9,693. The calculator correctly handled the leap year birthday.

• DOB: December 31, 2025. As of September 13, 2026: 0 years, 8 months, 13 days. Total days lived: 256. Demonstrates the calculator works for very young ages too.

How It Works

The calculator counts the complete years between your date of birth and today, then counts the remaining complete months, then the remaining days. It accounts for varying month lengths (28-31 days) and leap years (February 29 in divisible-by-4 years, except century years not divisible by 400).

When You Need This

A parent tracking their baby's exact age in months for pediatrician visits. Someone born on February 29 checking if this year they get a real birthday. An HR manager verifying age for retirement eligibility. A government office requiring exact age in days for legal purposes. Anyone curious about how many days they have been alive.

Step-by-Step

(1) Open the Age Calculator. (2) Enter your date of birth using the date picker. (3) See your exact age in years, months, and days instantly. (4) Check total days lived and next birthday countdown below the main result.

How It Compares

Timeanddate.com has an age calculator but loads external resources and shows ads. Calculator.net works but has a cluttered interface. Our tool runs instantly in your browser with no ads, no account, and also shows total days lived — a feature most free age calculators skip.

Limitations

The calculator uses calendar dates only — it does not account for time of birth. Future dates are not supported. Age is calculated from date of birth to today's date only.

Privacy

Your date of birth is processed entirely in your browser. It is never sent to any server. No one at FreeDigitalToolkit can see the date you enter.