Age & Birthday Calculator
Enter your date of birth to calculate your exact age and see the countdown to your next birthday.
Age is calculated using the birth date and the selected "as of" date. If today is your birthday, the countdown shows 0 days.
Frequently Asked Questions
How is my exact age calculated?
Your age is calculated by comparing your date of birth with the reference date. You are one year older once the anniversary of your birth date passes; months and days are counted from your last birthday to the reference date.
How do I calculate my age in years, months and days?
Count whole years from your birth date, then whole months from your most recent birthday, then the remaining days up to today. The calculator does all three instantly.
When is my next birthday?
Your next birthday is the next occurrence of your birth month and day after the reference date. The countdown shows how many months and days remain.
Why does my age in years sometimes differ from my age in days divided by 365?
Because a year has either 365 or 366 days and birthdays fall on the same calendar date each year. The calculator uses calendar months and dates, which is how age is officially counted.
Is the age calculator free and private?
Yes — completely free, works in your browser without any sign-up, and no data ever leaves your device.
Can I calculate age for any date, not just today?
Yes — change the "as of" date to calculate the exact age at any past or future point, which is useful for legal documents, insurance or historical records.
How old am I if I was born in 1990?
If you were born in 1990, you are currently in your 30s. Your exact age depends on the specific month and day, which you can see instantly by entering your full birth date in the calculator.
How many days old am I?
Your age in days is the total number of days from your date of birth to today. For example, a 20-year-old is roughly 7,300 days old. The calculator shows your exact age in days, months and years at once.
Age Calculator — Your Exact Age, Every Time
Wondering exactly how old you are? Our free age calculator turns a date of birth into a precise answer in years, months and days — no mental arithmetic, no rounding. It also shows how long you have been alive in total days, weeks and months, and counts down to your next birthday so you never miss it. Fast, private and available in 11 languages.
Built for everyone
- Instant exact age in years, months and days.
- Live countdown to your next birthday.
- Adjustable "as of" date — calculate age at any point in time.
- Total days, weeks and months alive at a glance.
- Handles leap-year birthdays (29 February) correctly.
- Works completely offline and privately — no sign-up, no data upload.
Popular ways to use the age calculator
- Checking your exact age in years, months and days.
- Counting down to a child's birthday or your own.
- Filling in forms, insurance or legal documents that need an exact age.
- Age verification for school admissions or sports categories.
- Tracking a pet's age in human terms for fun.
- Researching historical dates — how old would someone be today?
Age is one of those numbers everyone asks about — at birthdays, on forms, in conversations. With this calculator, the answer is always accurate and instant. Bookmark it for birthday season, keep it handy for paperwork, or simply satisfy your curiosity about how many days you have lived so far.