Age Calculator

How age is calculated

Age is counted in whole years, then whole months, then days, exactly as it appears on forms. Months are stepped from the birth date, so someone born on the 31st completes a month on the last day of shorter months. Leap-day birthdays complete a year on 28 February in common years. The total in days, weeks and hours uses the exact number of calendar days.

Age on a specific date

Exam eligibility, visa applications and insurance often ask for your age on a cut-off date rather than today. Set the "Age on" field to that date. For "minimum 18 on 1 January", enter 1 January of that year and check the years figure.

Next birthday and milestones

The countdown to your next birthday and the weekday you were born on come from the same calendar math. Day milestones (your 10,000th day, for instance) are calculated from the birth date and fall on the same weekday pattern every 7,000 days.

Privacy

Dates are only used in your browser and remembered on your device so the page shows the same result when you return. Nothing is sent anywhere.