Age Calculator

What this calculates

Age sounds simple until you have to write it on a form. "Twenty-six" is not the same as "26 years, 4 months and 11 days", and application forms, insurance quotes and school admissions all want the precise version.

This works it out from the date of birth to today, accounting for months of different lengths and for leap years, and also gives the total in days and weeks — which is what medical forms and visa applications tend to ask for.

Where an exact age is needed

• School admissions — most boards have an age cut-off measured to the day.
• Competitive exams — eligibility windows are stated as an exact age on a given date.
• Insurance — premiums step up on a birthday, so the exact age changes the quote.
• Visas and passports — several forms ask for age in completed years and months.
• Medical records — infants are recorded in weeks or days rather than years.

How the months are counted

Months are counted as calendar months, not as fixed 30-day blocks. Someone born on 31 January is one month old on 28 February in a normal year, because February has no 31st — the calculation lands on the end of the month rather than spilling into March. That is the same convention forms expect.

Frequently Asked Questions

Other free tools