Age Calculator
Enter your date of birth to calculate your exact age
Your Date of Birth
About Age Calculator
Enter a birth date and get an exact age: years, months and days, plus totals in weeks, days and hours. Useful for forms that need an age on a specific date, and for anyone curious how many days they have been alive.
How exact age is counted
Age in years increments on the birthday, not by dividing days by 365. The calculator counts completed years first, then the remaining months, then the leftover days — which is why the day count changes depending on the length of the months involved. Leap days are handled by the calendar itself rather than by an average.
What happens to people born on 29 February?
Legally it varies by country: some treat the birthday as 28 February in common years, others as 1 March. Calculators usually pick one convention silently. For anything with a legal deadline attached — a licence, an age of majority — check which rule the relevant authority applies rather than trusting a calculator.
Why does another site give a different number?
Almost always time zones. If the tool uses UTC and you are ahead of it, your local date can already be tomorrow while the calculation still says today — shifting the result by a day around midnight. Age also changes at midnight local time, not at a fixed global instant.