Age Calculator
Calculate exact age in years, months and days, total days lived, age in months and the countdown to the next birthday.
Age calculator
Calculate exact age, total days lived and the countdown to the next birthday.
Exact age
Total days lived
Next birthday
Age in months
How age is calculated
Exact age is calculated using calendar years, months and days rather than dividing the total number of days by a fixed year length.
Total days lived is based on the elapsed calendar time between the selected birth date and calculation date.
The next birthday countdown is measured from the calculation date and automatically handles leap years.
How to use it
Select the date of birth and the date you want to calculate age on. The calculator shows exact calendar age, total days lived, total completed months and days until the next birthday.
Privacy
Calculations are performed locally in your browser. The dates you enter are not submitted to Muft.
Tool behavior last checked Aug 23, 2026.