Date of birth
Age Calculator – Calculate Your Exact Age Online
Use this free age calculator to instantly calculate your age in years, months, days, weeks, and total days lived. Also works as a birthday calculator with next birthday countdown.
Interactive age calculation
Select your date of birth above
Your exact age in years, months, and days will appear instantly. Optionally set a specific date to calculate age at that moment.
About This Age Calculator
This free tool helps you determine your exact age based on your date of birth. Enter your birthdate and instantly see your age broken down into years, months, and days. You'll also get total days lived, total weeks, and total months—providing multiple ways to understand your lifespan. The result includes how old you are right now, plus days until your next birthday. Whether you're looking for precise age for documentation, curious about how many days you've lived, or planning a birthday celebration, this tool delivers accurate results instantly and privately on your device.
Everything you need in a age calculator
Exact Years, Months & Days
Breaks your age into the most precise components — not just full years, but the exact leftover months and days too.
Total Days Lived
See the total number of days you've been alive — a perspective-shifting figure most people have never calculated.
Total Weeks & Months
Alongside total days, get your age expressed as total complete weeks and total complete calendar months.
Next Birthday Countdown
Always shows exactly how many days remain until your next birthday, recalculated fresh every time you visit.
Leap Year Aware
Handles Feb 29 birthdays, leap year edge cases, and month-length differences with mathematically correct carry-over logic.
Instant Results
Results appear the moment you select a date — no submit button, no waiting.
How to use the age calculator
Select birth date
Use the calendar picker or enter your exact date of birth.
Select target date
By default it measures to today, but you can change it to any past or future date.
Read the results
Your age and milestones calculate instantly below the inputs.
Who uses this age calculator?
Medical Records
Provide exact age in months and days for pediatric or medical forms.
Parenting
Track exactly how many weeks or months old your baby or toddler is.
Milestones
Find out exactly what day you hit 10,000 days alive.
Why use ClockUnit instead of an app?
While most age calculators just subtract years, ClockUnit provides a deep-dive into your personal timeline. We calculate everything from your exact total days lived to your upcoming astrological milestones, all powered by High-Precision browser-native dates.
Our tool is optimized for fast, accurate results without needing any personal data stored on a server. It's the perfect utility for verifying age-restricted forms, checking milestones, or just satisfying curiosity.