How does the Age Calculator count age?
It uses the common birthday-based system where age increases on a person's birthday. Someone who has lived for 3 years and 11 months is still 3 years old until the next birthday.
Age Calculator
Calculate the time between a date of birth and another date.
Date & Time Toolsavailable
Enter a date of birth and an age at date, then calculate the interval.
Your age calculation will appear here.
About Age Calculator
Calculate the time between a date of birth and another date. The Age Calculator shows a birthday-based age in years, months, and days, then breaks the same interval down into weeks, days, hours, minutes, and seconds.
How to use
- Enter the date of birth.
- Enter the date you want to calculate the age at.
- Click Calculate Age to see the age and interval breakdown.
Features
- Uses the common birthday-based age system.
- Shows years, months, weeks, days, hours, minutes, and seconds.
- Handles leap years and uneven month lengths with consistent date-to-date calculations.
Common use cases
- Checking someone's age on a specific date.
- Calculating the interval between two dates.
- Comparing age or elapsed time for records, forms, and personal planning.
Frequently asked questions
Can age be counted differently?
Yes. Some cultures and traditions count age differently. This tool uses the standard birthday-based method used in most western countries.
Why can month and day results look unusual?
Months have different lengths, so calculations across February or from the end of one month to another can look different depending on the method. ToolMetro uses a consistent date-to-date approach so results remain predictable.