Age Calculator
The Age Calculator can determine the age or interval between two dates. The calculated age will be displayed in years, months, weeks, days, hours, minutes, and seconds.
Modify the values and click the calculate button to use
About Age Calculation
The age of a person can be counted differently in different cultures. This calculator is based on the most common age system. In this system, age increases on a person’s birthday. For example, the age of a person who has lived for 3 years and 11 months is 3, and their age will increase to 4 on their next birthday one month later. Most western countries use this age system.
In some cultures, age is expressed by counting years with or without including the current year. For example, a person who is twenty years old is the same age as another person who is in their twenty-first year of life. In one of the traditional Chinese age systems, people are born at age 1 and their age increases up at the Traditional Chinese New Year rather than their birthday. For example, if one baby is born just one day before the Traditional Chinese New Year, 2 days later, the baby will be 2 even though he/she is only 2 days old.
In some situations, the months and day result of this age calculator may be confusing, especially when the starting date is the end of a month. For example, we count Feb. 20 to Mar. 20 to be one month. However, there are two ways to calculate the age from Feb. 28, 2022 to Mar. 31, 2022. If we consider Feb. 28 to Mar. 28 to be one month, then the result is one month and 3 days. If we consider both Feb. 28 and Mar. 31 as the end of the month, then the result is one month. Both calculation results are reasonable. Similar situations exist for dates like Apr. 30 to May 31, May 30 to June 30, etc. The confusion comes from the uneven number of days in different months. In our calculations, we use the former method.
About Age Calculation Methods
Age is calculated differently across cultures. This calculator uses the international standard (Western system) where:
- Your age increases by 1 on each birthday
- For example, someone aged “3 years and 11 months” remains 3 years old until their next birthday
Cultural Variations:
- East Asian Counting:
- Babies start at age 1 at birth
- Everyone gains a year at the Lunar New Year
- Example: A baby born one day before Lunar New Year becomes “age 2” after the celebration
- Month-End Calculations:
- Dates at month-ends can create ambiguity:
- Feb 28 → Mar 31 can be counted as:
- 1 month (counting both as month-ends)
- 1 month and 3 days (fixed-day method)
- Feb 28 → Mar 31 can be counted as:
- We use the fixed-day method (option 2) for consistency
- Similar situations occur between April 30-May 31, May 30-June 30, etc.
- Dates at month-ends can create ambiguity:
