How to use the Age Calculator
- 1 Enter the date of birth.
- 2 Leave Age on this date as today, or pick another date, for example the closing date of a job or admission form.
- 3 Read the exact age, and the weekday of birth underneath.
- 4 Check total months, weeks, days and hours, and how many days remain until the next birthday.
Features
Calendar-exact
Months and days are counted on the real calendar, borrowing days from the previous month the same way people count ages by hand, so the answer matches official forms.
Age on any date
Calculate age on a past or future date, which is what eligibility rules on job, visa and exam forms usually ask for.
Leap-day birthdays
People born on 29 February celebrate on 1 March in years without a leap day, and the countdown handles this automatically.
When to use it
Form eligibility
Many recruitment and admission forms set an age limit on a specific date. Enter that date to check your age exactly as the form counts it.
Milestones
Find out when someone turns 10,000 days old or how many weeks old a baby is today.
Children's ages for school and vaccines
Schools and health programmes often set rules by age in months or on a cut-off date. Enter the child's date of birth and the cut-off date to see the age exactly as the rule counts it.
Frequently asked questions
How is age calculated in years, months and days?
Full years are counted first, then full months, then the remaining days. If the day of the month has not been reached yet, the days are borrowed from the previous month.
Why does my age differ by a day from another calculator?
Calculators handle month ends differently. This one counts calendar days from the date of birth to the chosen date, which is how most official forms count.
Does the time I was born matter?
No. The calculator works with dates only, which is what certificates and forms use.
Can I calculate the age between any two dates?
Yes. Enter the earlier date as the date of birth and the later date in Age on this date.
Is my date of birth stored?
No. The calculation runs in your browser and nothing is saved or sent.
How old am I in months or weeks?
Look at the totals below the main result. Total months counts complete months since birth, and total weeks counts complete seven-day weeks, so they are always whole numbers.
Reviewed by ToolsUnlocked Team · Last updated