Graduation Year Calculator

DateMath takes the first fall in which the child is 5 years old on or before the cutoff date as the kindergarten year. A cutoff from July to December falls in that fall: born on or before the cutoff's month and day, kindergarten starts the fall of the year they turn 5; born after it, the year after. A cutoff from January to June falls in the spring of the same school year, such as January 1, 2027 for the 2026–27 year: born on or before it, kindergarten starts the fall before the year they turn 5; born after it, the fall of that year. Kindergarten and grades 1 to 12 make 13 school years, so the class graduates in the spring 13 years after kindergarten starts. A school year is counted from July 1 to June 30, so the grade changes on July 1.

• The Gregorian calendar. DateMath treats every date as a Gregorian date, with its leap-year rule: a year divisible by 4 is a leap year, except century years not divisible by 400, so 2000 had a February 29 and 2100 will not. Source: Gregorian calendar.

DateMath's date math is tested against more than 100 cases worked out by hand. Every worked example and table on the site is computed with the same code the calculators run, so a page and its calculator can't disagree.

A child graduates from high school 13 school years after starting kindergarten: kindergarten plus grades 1 to 12. And kindergarten starts in the first fall when the child is 5 by the school’s cutoff date. So the graduation calculator by birthday needs two things, the date of birth and the cutoff, and gives the class year, the fall kindergarten starts and the grade on any date.

The method, step by step

Born October 14, 2019, with a September 1 cutoff:

1. Compare the birthday with the cutoff: October 14 comes after September 1, so the child is still 4 on the cutoff in 2024.
2. Kindergarten starts the next fall, when the child is 5 on the cutoff: fall 2025.
3. Add 13 school years: kindergarten in 2025–26, 12th grade in 2037–38, so the class of 2038.

Born on or before September 1 the same year, the child would have started a year earlier and be in the class of 2037. DateMath counts a birthday on the cutoff day itself as in time.

With a September 1 cutoff, everyone born from January 1 to September 1 of a year is in one class, and everyone born from September 2 to December 31 in the next. The grade is the one for 2026–27 on an on-time path.

For the child born October 14, 2019, on time, the school years run:

High school, grades 9 to 12, starts in fall 2034. A four-year college degree started right after it is the college class of 2042.

Kindergarten cutoff dates differ by state, and some states leave the date to each district, so a child born in the fall can be in different classes in two places. DateMath doesn’t keep a state table: check your school district’s rule and enter its date. For a child born September 15, 2020:

A cutoff from January to June falls in the spring of the school year, after kindergarten has started: with “5 on or before January 1,” the 2026–27 kindergarten class is the children who turn 5 by January 1, 2027. A child born in the fall can then start kindergarten at 4, a few months before the 5th birthday, and the calculator counts any cutoff in those months that way.

Early entry, redshirting and repeated grades

The calculator gives the on-time path. A child who starts kindergarten a year late, which is often called redshirting, graduates a year later; one who skips a grade or starts early through a district’s early entry rule, a year sooner. A school year is counted from July 1 to June 30 here, so the grade line moves up on July 1.

• Enrolling a child. The kindergarten year tells you when to register; the age calculator gives the exact age on the cutoff.
• Youth sports and camps. Teams that group players by graduation year rather than age use the class year.
• Reunions and yearbooks. The class year of someone born in a given year, on the usual path.
• Counting down. Looking for a graduation date calculator? The class year gives the spring of graduation; the day itself is the school’s to set, so put it in the day countdown when the school announces it; ceremonies are usually in May or June.