Calculators
Age Calculator
Calculate exact age from a birth date.
Calculate exact age in years, months and days from any birth date — and figure out the day of the week you were born. Useful for forms, school records, retirement planning and just answering ‘how many days have I been alive?’
Use the tool
What this tool does
An age calculator subtracts a birth date from a target date (today by default) and reports the difference broken down into years, months, days, total weeks and total days.
Why people use it
- Healthcare and government forms often require age in years and months.
- Insurance premiums depend on exact age at the policy date.
- Parents track milestones in months for the first few years.
- Retirement planners need exact ages for benefit eligibility dates.
Step-by-step guide
- Open the Age Calculator tool.
- Enter your birth date.
- Optionally enter a target date (defaults to today).
- See your age in years, months and days, plus the day of the week you were born.
Real examples
Filling a passport form
A parent calculates their child’s age in months and days for a passport application.
Pension start date check
A retiree confirms the exact date they reach 67 years old to file pension paperwork.
Common use cases
- Government forms
- Insurance applications
- School enrollment
- Retirement planning
- Birthday countdowns
Frequently asked questions
Is leap year handled?
Yes. The calculation uses calendar arithmetic that accounts for leap years and varying month lengths.
Can I calculate age between two arbitrary dates?
Yes — set both the birth date and target date.