Enter a date of birth to get an exact age in years, months and days – or measure the time between any two dates.
🔒 Dates are calculated in your browser and never sent anywhere.
How to use the age calculator
- Enter the date of birth (or start date).
- Optionally change the 'age at' date.
- Read the exact age and next birthday countdown.
Date difference calculator
Set any two dates to measure the exact time between them – handy for anniversaries, contracts and project deadlines.
Frequently asked questions
How is age calculated?
Full years are counted first, then remaining months, then remaining days, exactly as on official forms.
Does it account for leap years?
Yes. It uses the real calendar, including leap years.
Can I calculate age on a past or future date?
Yes. Change the 'age at' date.