Planning tool
Age Calculator
Calculate exact age in years, months, days, total days, and the next birthday.
Runs in your browser- Exact age
- 31 years, 7 months, 17 days
- Total months
- 379
- Total days
- 11,552
- Next birthday
- 1/1/2027
- Days until next birthday
- 136
How to use this age calculator
- Enter the birth date and comparison date, using the local calendar dates rather than approximate years.
- Review the calculated totals, units, and assumptions. Check the inputs and units before relying on the result.
- Change one input at a time to compare another case, then copy or save the result you plan to use.
About this age calculator
Age Calculator helps you calculate exact age in years, months, days, total days, and the next birthday. The input and result appear together for easy comparison.
You can also use it to compare results after changing one input.
Example
Enter a birth date and today's date to see exact age, total days lived, and the time until the next birthday.
Common uses
- → calculate exact age in years, months, days, total days, and the next birthday
- → compare results after changing one input
- → save an estimate for planning or comparison