The age of a person can be counted differently in different cultures. This age 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.

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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 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 someone who is in their twenty-first year of life. In particular, one traditional Chinese age system considers people to be born at age 1, and their age increases at the Traditional Chinese New Year instead of their birthday. As a result, if a baby is born just one day before the Traditional Chinese New Year, two days later that baby will be 2 years old, even though they are only 2 days old. This shows how different cultures count age differently — and why using an accurate Age Calculator can help avoid confusion.

Number of Days per Month

January – 31 days

February – 28 days in a regular year

February – 29 days in a leap year

March – 31 days

April – 30 days

May – 31 days

June – 30 days

July – 31 days

August – 31 days

September – 30 days

October – 31 days

November – 30 days

December – 31 days

You can count the days until a special day like a birthday, Thanksgiving, the Fourth of July, or the start of your vacation. Assuming the date is less than a year away, tally up the number of days per full month between now and your target date. Then add the partial months — the number of days left in this month, and the number of days in the partial month before your target date.

Learn more about how age is calculated from date of birth on Wikipedia.

You can use this Age Calculator to find the number of days until an event date. Insert today’s date in the “Date of Birth” field, and your target date on “Find Age on” field. The calculator will compute the number of days till your date and display it in the exact number of days.