Does this age calculator account for leap years?

Yes. The calculator uses native calendar date arithmetic, so leap years (including February 29) are automatically accounted for in both the year/month/day breakdown and the total days lived figure.

Age Calculator

Find your exact age in years, months & days — plus zodiac sign, Chinese zodiac, and birthday countdown. Free, instant, no signup.

Date of Birth

Calculate Age As Of

About Age Calculator

This tool calculates your exact age in years, months and days using accurate calendar date arithmetic, including correct handling of leap years. It also breaks your age down into total weeks, days, hours, minutes and seconds.

Beyond the numbers, you get fun extras like your Western zodiac sign, Chinese zodiac animal, birthstone, and a live countdown to your next birthday.

Recent Calculations

Free Age Calculator — Find Your Exact Age in Years, Months & Days

If you've ever wondered "how do I calculate my exact age including months and days" — this tool gives you the answer instantly. The HB Tools Age Calculator by Haridash works out your precise age from any date of birth, down to the exact number of years, months, days, hours, minutes and seconds you've been alive. No software. No account. Completely free.

Whether you're filling out a form that needs your exact age, checking how many days until your next birthday, curious about your zodiac sign, or just love seeing your life measured in numbers — this calculator handles it all directly in your browser.

How to Calculate Your Age — Step by Step

Enter your date of birth in the first field, then click Calculate Age. By default, your age is calculated as of today — but you can change the Calculate Age As Of field to any past or future date to see what your age was, or will be, on that day.

Results are organized into clear sections: Age in Numbers, Next Birthday, Birth Day Facts, and Zodiac & Birthstone. You can export everything as JSON or CSV, or copy it to your clipboard with one click.

What Each Result Section Means

Here's what the calculator shows you in plain language:

Years, Months & Days — Your precise calendar age, accounting for varying month lengths and leap years. This is the figure most official forms ask for.
Total Days / Weeks / Months Lived — Your entire life converted into a single unit, useful for milestones like your 10,000th day alive.
Total Hours, Minutes & Seconds — A fun way to see just how much time has passed since you were born, including a live ticking seconds counter.
Next Birthday Countdown — The exact number of days until your next birthday, and which day of the week it falls on.
Day You Were Born — The day of the week and ISO week number of your birth date.
Zodiac Sign & Chinese Zodiac — Your Western astrological sign based on your birth month/day, and your Chinese zodiac animal based on your birth year.
Birthstone — The traditional gemstone associated with your birth month.

Why Calendar-Accurate Age Calculation Matters

Simple age calculators that just subtract years can be off by a year around birthdays, and naive day-counting often mishandles leap years. This tool uses native calendar date arithmetic to compute the year/month/day breakdown correctly in every case — including for people born on February 29th, whose "real" birthday only occurs once every four years.

This makes the calculator reliable for situations like age verification, eligibility checks (e.g. minimum age requirements), pension and retirement date planning, or simply settling a debate about who's older.

Common Reasons People Use an Age Calculator

Filling out official forms: Many applications ask for age in years, months, and days as of a specific date — not just years.
Checking eligibility: Verify if someone meets a minimum or maximum age requirement on a specific cutoff date.
Birthday planning: See exactly how many days remain until a birthday, and which day of the week it lands on.
Curiosity and fun: Find out your zodiac sign, Chinese zodiac animal, birthstone, or how many seconds you've been alive.
Comparing ages: Use the "Calculate Age As Of" field to find someone's age on a historical date, such as a wedding day or graduation.

How Is the Chinese Zodiac Sign Calculated?

The Chinese zodiac follows a 12-year cycle of animals — Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, and Pig — assigned by birth year. This calculator determines your zodiac animal from your birth year. Note that the Chinese New Year typically falls in late January or February, so people born in early January or December near the year boundary should double check against an official Chinese calendar for full accuracy.

Does This Tool Store My Date of Birth?

No. All calculations happen instantly in your own browser using JavaScript — your date of birth is never sent to or stored on our servers. Recent calculations are saved only in your browser's local storage for convenience, and you can clear that history at any time.

Other Free Calculators by HB Tools

📅 Date Calculator 📊 Percentage Calculator ⚖️ BMI Calculator ⏳ Countdown Timer

Frequently Asked Questions

Enter your date of birth and click Calculate Age. The tool instantly works out your exact age in years, months and days, along with totals in weeks, days, hours, minutes and seconds.

Yes. Use the Calculate Age As Of field to pick any date instead of today. The tool will show what the age was, or will be, on that exact date.

Yes. The calculator uses native calendar date arithmetic, so leap years — including February 29 birthdays — are automatically accounted for in both the year/month/day breakdown and the total days lived figure.

Your Western zodiac sign is determined by the month and day of your birth date, based on the standard 12 zodiac date ranges used in astrology. The tool also shows your Chinese zodiac animal based on your birth year.

After entering your date of birth, the Age in Numbers card shows the exact total number of days you have been alive, along with the equivalent in weeks, months, hours, minutes and seconds.

The tool finds the next occurrence of your birth month and day on or after the comparison date and shows exactly how many days remain, along with which day of the week your next birthday falls on.

No. All age calculations run entirely in your browser using JavaScript. Nothing is sent to or stored on our servers. Recent calculations are saved only in your browser's localStorage and can be cleared anytime using the Clear History button.