Age Calculator
Calculate your exact age online — get years, months, days, total days lived, and next birthday countdown. Free, instant, no sign-up required.
Updated May 2026
Chronological Precision
Our algorithm uses the Gregorian calendar and accounts for leap years to guarantee absolute accuracy.
Enter your date of birth to calculate
How to use this age calculator
Enter a birth date and a target date — everything else is automatic
1. Enter your date of birth
Pick it from the calendar or type it in directly.
2. Choose the target date
Defaults to today, but you can calculate age on any past or future date.
3. See the full result
Exact age in years, months and days, plus totals in weeks and hours, your zodiac sign, and a countdown to the next birthday.
What this age calculator does
Calendar-accurate math, not a rough estimate
Exact years, months and days
Calculated against the real calendar — never rounded to 30-day months.
Leap years handled correctly
February 29th is recognized in the math, even for people born in a leap year checking a non-leap year.
Totals in days, weeks and hours
A full breakdown of time lived, useful for curiosity or formal records.
Countdown to your next birthday
Shows exactly how many days are left, counted from the target date you choose.
Zodiac sign lookup
Your Western zodiac sign is derived automatically from the birth date you enter.
Fun estimates: hours slept, hours worked
Rough lifetime totals based on adjustable sleep and work hours per day, just for fun.
Example calculations
When you'll reach for this tool
The most common scenarios people use it for
Forms and paperwork
Fill in fields that require exact age in years, months and days.
Birthday planning
See exactly how many days are left until the next birthday from today.
Medical and pediatric calculations
Precise age in months and days is often required in clinical contexts.
Age-based eligibility
Confirm the exact age on a specific date for eligibility rules or deadlines.
Curiosity and horoscopes
Quickly check a zodiac sign or how many total days you've been alive.
Common mistakes when calculating age by hand
Dividing total days by 365.25
That gives an approximation, not the exact age in years, months and days.
Forgetting the target date can be in the past
It's not just "age today" — you can calculate age on any date, past or future.
Handling a February 29th birthday
In non-leap years the civil birthday is usually treated as Feb 28 or Mar 1 — this tool handles that consistently.
Why use this age calculator
The calculation uses real calendar arithmetic, not an approximate division by 365.25 — the result in years, months and days is exact, including for people born on February 29th.
Beyond age, it shows totals in days, weeks and hours, a countdown to the next birthday from your chosen target date, and a couple of fun extras like your zodiac sign and rough lifetime sleep/work hours — covering both casual and formal use.
Frequently asked questions
Enter your date of birth and a target date (today by default). The calculator works out the exact difference using real calendar math, with no rounding or approximation.
References
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