Age Calculator
Calculate your exact age in years, months, and days — plus your next birthday and fun facts. 100% client-side.
Your age
31years
3months 26days
🎂 Next birthday
In
247 days
Date
Tuesday, June 15, 2027
Weekday
Tuesday
⏱ You have lived
Months
375
Weeks
1,634
Days
11,441
Hours
274,584
Minutes
16,475,040
Seconds
988,502,400
🎈 Fun facts
Day you were born
Thursday
Western zodiac
Gemini
Chinese zodiac
Year of the Pig
🔒 100% private: All calculation happens in your browser. Your date of birth never leaves your device.
About Age Calculator
Calculating exact age seems trivial, but the math is not obvious. "Age" is usually measured in years, but that hides the exact months and days — important for medical forms, visa applications, and legal eligibility. Additionally, there are edge cases: leap years, month lengths varying between 28 and 31 days, and the ambiguity around "one year older" when the birthday falls on February 29. This tool computes your exact age from date of birth to today (or any other date): years, months, and days precisely; total days, weeks, hours, minutes; countdown to the next birthday; and fun facts like the day of the week you were born. Everything runs locally in your browser.
How It Works
- Enter your date of birth.
- Optionally change the "calculate age as of" date (defaults to today).
- See your exact age in years, months, and days.
- Scroll down for total units, next birthday, and day-of-week info.
✨ Key Features
- ✓Exact age in years, months, and days
- ✓Total months, weeks, days, hours, minutes lived
- ✓Next birthday countdown (days until, and which weekday)
- ✓Day of week you were born
- ✓Zodiac sign (Western)
- ✓Chinese zodiac
- ✓Leap-year awareness (Feb 29 birthdays handled)
- ✓Custom "as of" date (not just today)
- ✓Copy any value with one click
- ✓100% client-side — no data sent to any server
🎯 Common Use Cases
- →Filling out forms that require exact age
- →Checking eligibility (driving, voting, retirement)
- →Finding the day of the week you were born
- →Planning birthday celebrations
- →Calculating age differences between people
- →Filling out medical or visa paperwork
- →Fun — knowing how many days you have lived
- →Calculating a pet's age in human years (with your pet's birthdate)
💡 Advanced Tips & Pro Insights
- ▸Age is typically calculated in completed years — you turn 30 on your 30th birthday, not the day before.
- ▸For February 29 birthdays, most countries define the "legal birthday" as either February 28 or March 1 in non-leap years. This tool treats it as March 1 by default.
- ▸The total days lived changes every day. Refresh to update.
- ▸Weeks are calculated as days / 7 (integer). Hours are days × 24; minutes are days × 24 × 60.
- ▸The day-of-week you were born uses the Gregorian calendar. Dates before 1582 (the Gregorian calendar introduction) may vary by country.
- ▸Chinese zodiac cycles every 12 years. This tool uses the Chinese New Year as the year boundary — not January 1.
Frequently Asked Questions
Is this age calculator free?▾
Yes, this age calculator is completely free with no signup, email, or usage limits.
Is my date of birth safe?▾
Yes, 100% safe. All calculation happens in your browser. Your date of birth is never sent to any server.
How is age calculated?▾
Age is calculated in completed years, months, and days. For example, if you were born on 1995-06-15 and today is 2026-10-10, your age is 31 years, 3 months, 25 days (completed units).
What if I was born on February 29?▾
February 29 is a leap day. In non-leap years, the "birthday" is conventionally taken as February 28 or March 1 (varies by country). This tool treats it as March 1 for the "next birthday" countdown.
Why does the total days count seem different from what I expected?▾
It counts actual days elapsed, including leap days. If you were born on 1995-06-15, the total days lived counts every day from that date to today — including all Feb 29s in between.
Can I calculate age at a specific date?▾
Yes — change the "as of" date to any date (past or future). This is useful for forms (age on a specific cutoff date) or historical calculations.
What is the difference between "years" and "completed years"?▾
"Completed years" means how many full birthdays have passed. If you are 30 years, 3 months, and 25 days old, your completed years = 30. This is what forms usually want.
Does the tool handle the Chinese zodiac correctly?▾
Yes — the Chinese zodiac uses the Chinese New Year (which varies between Jan 21 and Feb 20 each year) as the boundary, not January 1. This tool uses the correct boundary.