Age Calculator
Find your exact chronological age, or check your dog's age in human years.
Leave "as of" as today for your current age, or set a specific date — useful for exam eligibility checks like UPSC, where age is calculated as of a cutoff date rather than today.
All calculations happen locally in your browser. No dates or personal information are uploaded or stored anywhere.
Age Calculator — By Date of Birth, Instantly
Someone asks how old you are and, for half a second, you actually have to think about it — was your last birthday this year or not? An online age calculator skips that hesitation. Enter your date of birth and this chronological age calculator works out your exact age down to the day, along with how many total months, weeks, and days you've been alive.
Not Just "How Old" — Exact, To the Day
The headline number is your age in years, months, and days — not rounded, not approximate. Below that, you'll see the same age converted into total months, total weeks, and total days, which is often what parents tracking a baby's age, or anyone filling out a form that wants age "in months," actually need.
Calculating Age As of a Specific Date
By default, this works as an age calculator for today — but the "as of" field can be changed to any date. That matters for situations like UPSC and other exam age-eligibility checks, where your age is calculated as of a specific cutoff date set by the exam body, not as of today. Set the "as of" field to that cutoff date, and the result reflects exactly what an evaluator would see.
Bonus: Dog Age Calculator
The old "multiply by 7" rule for dog years is a myth — dogs age faster in their first two years and then the rate slows, and it varies by size. The Dog Age Calculator tab uses a more realistic, size-adjusted formula: a dog's first year is roughly 15 human years, the second year brings it to about 24, and each year after that adds somewhere between 4 and 6 human years depending on whether your dog is small, medium, large, or giant breed.
Why the Month and Day Numbers Can Look "Off"
Every so often someone double-checks the math and it seems a day or two short. This usually happens because months don't all have the same number of days. Counting from, say, January 31st to March 3rd isn't a clean "one month, three days" the way it would be for two 30-day months — the calculator has to account for exactly how many days each specific month actually held. It's not a bug; it's just calendar math being calendar math.
A Quick Note on How "Age" Is Counted Differently Around the World
This calculator uses the system most common in Western countries: your age increases by one on each birthday, and stays the same in between. It's worth knowing that isn't universal — in some traditional East Asian counting systems, a baby is considered age 1 at birth, and everyone's age increases together on New Year rather than on individual birthdays. Neither system is "more correct" — they're just different conventions, and this tool follows the birthday-based system used across most of the world.
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