Age Calculator
Calculate your exact age or time between two dates
Leave blank to calculate age until today
Age Calculation Results
Your life progress (based on average 80-year lifespan)
The Complete Guide to Age Calculation
What is an Age Calculator?
An age calculator is a tool that determines the exact time duration between two dates, typically calculating how old someone is in various units of time. Our advanced calculator provides your age in years, months, weeks, days, hours, minutes, and even seconds!
How to Calculate Age Accurately
Calculating age might seem simple, but accounting for leap years and varying month lengths requires precision. Our calculator handles all these complexities automatically:
- Enter your birth date in the first field
- Optionally enter an end date (or leave blank for current age)
- Click “Calculate Age” to get instant results
The calculation considers:
- Leap years (including century year rules)
- Different month lengths (28-31 days)
- Time zone adjustments
- Daylight saving time changes
Practical Uses of Age Calculation
Child Development
Track milestones in months and weeks for babies and toddlers
Employment
Verify age requirements for jobs or retirement planning
Birthdays
Countdown to special birthdays in exact days and hours
Education
Determine school enrollment eligibility dates
Age Calculation Formulas
While our calculator handles all the math automatically, here’s how age calculation works behind the scenes:
Basic Age in Years Calculation:
Age = Current Year – Birth Year
(Adjusts -1 if birthday hasn’t occurred yet this year)
Precise Month Calculation:
Months = (Current Month – Birth Month) + (Current Year – Birth Year) × 12
(Accounts for month overflow and underflow)
Exact Days Calculation:
Days = Current Day – Birth Day + Month Day Adjustments + Leap Days
(Includes all calendar complexities)
Frequently Asked Questions
Why does my age sometimes show one day less?
This typically happens when calculating across time zones or daylight saving time changes. Our calculator accounts for these factors to give you the most accurate result possible.
How do you handle leap years in age calculation?
We automatically detect all leap years (including special rules for century years) and adjust the day count accordingly. February 29 birthdays are properly calculated for non-leap years.
Can I calculate age at a future date?
Yes! Simply enter your birth date and any future date in the end date field to see how old you’ll be on that specific date.
Why are there different age counting systems in some cultures?
Some cultures count age differently (like the East Asian age reckoning). Our calculator uses the international standard (Western) method, but we can add cultural variations if requested.
Interesting Age Facts
The average person lives about 30,000 days (82 years)
By age 18, you’ve lived approximately 940 weeks
The oldest verified person lived to 122 years (Jeanne Calment)