Age Calculator
About Age Calculator
The age calculator compares a birth date with another date and reports age in years, total days, and the next birthday countdown.
How to Use
The age calculator compares a birth date with another date and reports age in years, total days, and the next birthday countdown. Enter the Birth date and As of date values and review the Age, Total days, and Days to next birthday outputs after you calculate.
- Open the calculator : Use Age Calculator from the Time category.
- Check the inputs : Review the required values and any optional settings.
- Read the formula : Use the formula and notes below to understand how the result is produced.
Common Questions
What does the Age Calculator estimate?
Calculate age, total days lived, and days until the next birthday.
What time settings can change the result?
Date boundaries, local time, daylight-saving changes, and timezone settings can affect the result.
How is exact age mathematically calculated?
Age is traditionally calculated by determining the number of full years passed since the date of birth. Our calculator takes this further by computing the exact difference in months, days, and days factoring in leap years, to give you a precise chronological timestamp.
Inputs
- Birth date
- As of date
Outputs
- Age
- Total days
- Days to next birthday
Formula
Age is the number of full calendar years between birth date and the as-of date.