How Many Months Are in a School Year?

A typical school year spans approximately 9 to 10 months; however, the length varies by country and region. Learn the details in this post now!
Updated: May 15, 2025
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After summer break, students return to school for several months of classes and exams. But "how many months are in a school year" varies by country. Let’s explore the typical duration and differences worldwide.

How Long is a School Year: General Duration

A typical school year generally spans approximately 9 to 10 months, divided into semesters, trimesters, or even quarters, depending on the specific scheduling system. This duration is designed to balance academic learning with breaks for holidays and vacations.

In many countries, the school year starts in late August or early September and ends in early June, or even earlier, in late May the year after. This structure allows for a long summer break, a common feature in many educational systems.

Calculate How Many Months, Weeks, and Days in a School Year

It’s easy to determine the number of months, weeks, or days in a school year by hand or using online time calculators.

If a school year lasts around 9 months, from early September to early June, for example, that’s approximately 38-39 weeks. With a five-day school week and accounting for breaks and holidays, this adds up to about 180 school days or less. However, this estimate doesn’t factor in other non-school days.

To ensure accuracy, the most important thing here is to identify the exact start and end dates of the school year. And then you can use online time calculation tools, such as the “How Many Months” and Subtract Time Calculators, to find the precise duration. Here’s how:

Step 1. Identify the start and end dates of the school year.

Step 2. Go to the “How Many Months” calculator.

Step 3. Enter the Start and End dates into the provided fields.

Step 4. Press the “Calculate” button to view the results, which will show how many months the school year lasts, along with the equivalent number of days, hours, minutes, and even seconds.

For instance, if a school year begins on September 1 and lasts until June 15 the following year, it spans approximately 9.43 months, or 9 months and 13 days.

It’s worth noting that these results don’t yet account for breaks and holidays within the school year. So, to account for them and determine exactly how many days are in a school year, use the "subtract time calculator" to deduct them from the total numbers calculated in step 4 recently.

Variations in School Year Length Across Countries

The length and structure of the school year can vary widely depending on the country, educational systems, climate, and other factors.

  • United States: The typical school year is around 160-180 days (around 9 months) with the exact number mainly depending on the states. In fact, school years at universities and colleges tend to be shorter.
  • Japan: The new school year begins in early April and ends in March of the following year (about 10–11 months), with breaks in summer, winter, and spring in between. This structure results in as many as 210 school days.
  • Finland: Known for its high-performing education system, Finland's school year lasts about 190 days or less, starting in mid-August and ending in late May.
  • Portugal: Most schools follow a similar academic calendar, typically running from mid-September to mid- or late June, with some exceptions. In higher education, such as universities and polytechnic institutes, the academic year generally starts in early September and extends to mid or late July.
  • Wales: In Wales, a school year consists of 190 days spread over 39 weeks and split into three terms, with school holidays and breaks in between.

FAQs

What Are Common School Holidays in the U.S.?

In the U.S., schools share a wide range of holidays and vacation days, including Thanksgiving break (late November), winter break (late December to early January), spring break (a whole week off in March), and fall break. Additionally, there are also various public holidays, such as Labor Day, Memorial Day, Veterans Day, Martin Luther King Jr. Day, etc., which give students days off.

How Many School Days are Typically in a Year?

The number of school days varies by country and region. In the United States, it's commonly around 180 days; however, the actual length of the school year varies by state. To illustrate, according to the Pew Research Center, 07 states have set minimum school days below 180, with Colorado having the lowest requirement at 160 days.

Why Do Some Countries Have shorter/Longer School Years?

The length of the school year can be influenced by several factors, including cultural traditions, climate, and more. For example, in countries and regions with harsh winters, shorter school years may be necessary due to inclement weather.

To conclude, while the typical school year lasts around 9 to 10 months,  its length varies significantly across countries and regions. In short, there’s no one-size-fits-all answer to how many months are in a school year. However, as long as you know the start and end dates, along with breaks and holidays in between, you can easily calculate the exact number of months and days for any school year.