Age Calculator

📅 Calculate Your Age

Date of Birth

Age At Date (leave blank for today)

Calculate Age Reset

How the Age Calculator Works

Our age calculator computes the precise difference between your date of birth and today's date — or any reference date you choose. It breaks your age down into years, months and remaining days, then converts the total into weeks, days and hours for a complete picture.

Age Formula

Age is calculated using the following approach:

Age (Years) = Reference Date − Date of Birth
If birthday has not yet occurred this year: Age = Full Years − 1

Total Days  = (Reference Date − Date of Birth) in days
Total Weeks  = Total Days ÷ 7
Total Months = (Years × 12) + Remaining Months
Total Hours  = Total Days × 24

Leap Year Handling

The calculator automatically accounts for leap years. People born on 29 February have their birthday counted on 28 February in non-leap years, which is the standard legal convention in most countries.

Time Zone Note

All calculations are based on calendar dates only and do not factor in time zones or the exact time of birth. Results reflect the number of complete years, months and days elapsed.

Understanding Age Calculation

Age is the amount of time that has elapsed since a person's birth. In most countries it is expressed as the number of complete years lived. However, age can also be expressed in months (for infants), weeks or total days — all of which this calculator provides instantly.

Why Calculate Your Exact Age?

• Confirming eligibility for age-restricted services, benefits or legal requirements
• Calculating age for insurance policies, pension plans and retirement planning
• Medical and health assessments that require precise age in months or days
• Checking a child's age for school enrolment cut-off dates
• Personal milestones — find out exactly how many days or weeks old you are
• Visa applications, legal documents and official registrations

Different Ways to Express Age

While "years old" is the most common way to state age, different contexts call for different units. Paediatricians track infant growth in months and weeks. Insurance actuaries work in exact days. This calculator gives you all of these in one place with no extra effort.

Frequently Asked Questions