What grade is a 15 year old in?

Age 15 · 2026–27

9th grade or 10th grade

A 15-year-old is usually in 9th grade or 10th grade. Which one depends on their birthday and your state's kindergarten cutoff (September 1 in most states).

For 2026–27: 10th grade if born Sep 2, 2010 – Sep 1, 2011.

9th grade if born Sep 2, 2011 – Sep 1, 2012.

Grade by age is a guide, not a rule. Some families wait a year to start kindergarten (often called redshirting), some schools allow early entry, and homeschoolers can place a child by readiness in each subject.

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Age by grade for 2026–27 (September 1 cutoff)
Grade	Typical age	Birthdates
Preschool (3s)	3–4	Sep 2, 2022 – Sep 1, 2023
Pre-K (4s)	4–5	Sep 2, 2021 – Sep 1, 2022
Kindergarten	5–6	Sep 2, 2020 – Sep 1, 2021
1st grade	6–7	Sep 2, 2019 – Sep 1, 2020
2nd grade	7–8	Sep 2, 2018 – Sep 1, 2019
3rd grade	8–9	Sep 2, 2017 – Sep 1, 2018
4th grade	9–10	Sep 2, 2016 – Sep 1, 2017
5th grade	10–11	Sep 2, 2015 – Sep 1, 2016
6th grade	11–12	Sep 2, 2014 – Sep 1, 2015
7th grade	12–13	Sep 2, 2013 – Sep 1, 2014
8th grade	13–14	Sep 2, 2012 – Sep 1, 2013
9th grade	14–15	Sep 2, 2011 – Sep 1, 2012
10th grade	15–16	Sep 2, 2010 – Sep 1, 2011
11th grade	16–17	Sep 2, 2009 – Sep 1, 2010
12th grade	17–18	Sep 2, 2008 – Sep 1, 2009

Cutoff source: NCES State Education Reforms, Table 1.3: kindergarten entrance requirements by state. Checked October 2026.

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A 15-year-old is usually in 10th grade (a sophomore), or in 9th grade if they turned 15 after the fall cutoff.

In states with a September 1 cutoff, 10th graders for 2026–27 were born between September 2, 2010, and September 1, 2011, and 9th graders between September 2, 2011, and September 1, 2012. Sophomore year is often Geometry or Algebra II, biology or chemistry, and a second year of a foreign language. Many students take the PSAT for practice in 10th grade, and it's a good time to look at dual-enrollment rules in your state.

Use the calculator above for an exact answer: enter your child's birthdate and choose your state, and it applies that state's kindergarten cutoff to the 2026–27 school year. Grade by age is a guide, not a rule. Homeschool families can place a child by readiness, even at different levels in different subjects.

Tips for using it

If you're homeschooling, look up your community college's dual-enrollment age and testing rules now; many start at 16 or in 11th grade.
A practice PSAT or SAT in 10th grade shows what to work on before the scores count.

Variations

All what grade is my child

Questions

Is a 15-year-old in 9th or 10th grade?

Either. A child who turned 15 by the fall cutoff is usually in 10th grade; one who turns 15 during the school year is usually in 9th.

Can a 15-year-old take college classes?

Sometimes. Dual-enrollment rules are set by each state and college. Some admit students by test scores at 15 or younger, while others start in 11th grade or at 16.