Tools · Android
Age Calculator
Calculate your exact age in years, months and days, and find your next birthday
Know your exact age, down to the day
Age Calculator instantly works out your exact age in years, months and days from a date of birth, along with how long until your next birthday, your total age in days, and other date-based facts. It's built for the everyday moments a rough 'I'm 27' isn't precise enough — form fields that ask for an exact age, eligibility checks, or just settling a friendly argument about who's older by exactly how much.
Key features
- ✓Exact age in years, months and days from any date of birth
- ✓Countdown to your next birthday
- ✓Total age shown in days, weeks and months for fun or reference
- ✓Compare ages between two people or two dates
- ✓Clean, fast interface with instant results as you pick a date
- ✓Useful for eligibility checks, forms and official age requirements
- ✓Share your calculated age easily with others
- ✓Works entirely offline — no data connection needed
Guides & articles
In-depth guides related to Age Calculator.
Common Age Milestones and Legal Thresholds Through Life
A general overview of common age-based milestones and legal thresholds people encounter through life, and why they vary by country.
Read article →How to Accurately Calculate the Age Difference Between Two People
How to properly calculate the exact age gap between two people, and why 'subtract the birth years' often gives the wrong answer.
Read article →Age Eligibility Requirements: Why 'As Of' Dates Matter
How age-based eligibility cutoffs work for exams, jobs and legal requirements, and why the 'as of' date matters as much as your birth date.
Read article →Your Age in Days: Fun Milestones Worth Celebrating
Why counting your age in total days reveals fun, oddly satisfying milestones most people never think to calculate or celebrate.
Read article →How to Count Down to Your Next Birthday (And Why People Do It)
The appeal of birthday countdowns, how they're calculated correctly, and simple ways to use one for planning ahead.
Read article →How Different Cultures Calculate Age Differently
A look at age-reckoning systems around the world that count age differently from the common Western birthday-based method.
Read article →How to Calculate Your Exact Age in Years, Months and Days
The actual method for calculating exact age from a date of birth, including why leap years and month lengths make manual calculation error-prone.
Read article →Born on 29 February? How Leap Year Birthdays Actually Work
How people born on 29 February calculate their age and celebrate birthdays in non-leap years, and how official systems handle it.
Read article →Pet Age in Human Years: Why 'Multiply by 7' Is Wrong
Why the popular 'dog years times seven' rule is inaccurate, and how age conversion for pets actually works based on real veterinary research.
Read article →Why Date Calculations Are Harder Than They Look
A look at why seemingly simple date math — age, durations, deadlines — is a surprisingly common source of real-world errors.
Read article →Frequently asked questions
How accurate is the age calculation?+
The calculator works out your exact age down to the day, accounting for varying month lengths and leap years, not just a rough estimate based on birth year.
Can I calculate age as of a specific date, not just today?+
Yes, you can calculate age as of any chosen date, not only the current date — useful for eligibility checks tied to a specific cutoff date.
Does the app tell me how many days until my next birthday?+
Yes, alongside your exact current age, the app shows a countdown to your next birthday.
Does the app need an internet connection?+
No, age calculation works entirely offline, since it's a straightforward date calculation done on your device.
Is the app free to use?+
Yes, Age Calculator is free to download and use from the Google Play Store.