Calendar Quarter Calculator

Find the calendar quarter for any date, including its quarter number and the three-month period it belongs to.

Find the calendar quarter

How to find the quarter of a date

This calendar quarter calculator identifies which of the four standard calendar quarters contains a selected date. Enter a date to determine whether it falls in Q1, Q2, Q3, or Q4.

How to use the calculator

Select a date from the date field.
Choose Calculate to find its calendar quarter.
Review the quarter result and its corresponding three-month period.
Choose Reset to clear the date and make another calculation.

Calendar quarter dates

Q1: January 1 to March 31.
Q2: April 1 to June 30.
Q3: July 1 to September 30.
Q4: October 1 to December 31.

Calendar quarter formula

Quarter number = ceiling(month number ÷ 3)

January is month 1 and belongs to Q1; April is month 4 and belongs to Q2; July is month 7 and belongs to Q3; and October is month 10 and belongs to Q4.

Example

If the selected date is May 18, it falls in Q2 because May is the fifth month of the year. Q2 runs from April 1 through June 30.

When is a quarter calculator useful?

Grouping sales, revenue, and expenses by calendar quarter.
Preparing quarterly reports and business reviews.
Organising project milestones by quarter.
Checking reporting periods for a selected date.
Planning personal or business goals across the year.

Frequently asked questions

1. How many calendar quarters are there in a year?

There are four calendar quarters in a year, and each quarter contains three months.

2. Which months are in Q1?

Q1 includes January, February, and March.

3. Which months are in Q2?

Q2 includes April, May, and June.

4. Which months are in Q3?

Q3 includes July, August, and September.

5. Which months are in Q4?

Q4 includes October, November, and December.

6. What quarter is June in?

June is in Q2, the second calendar quarter of the year.

7. What quarter is October in?

October is in Q4, the fourth calendar quarter of the year.

8. What is the difference between a calendar quarter and a fiscal quarter?

A calendar quarter follows the standard January-to-December calendar. A fiscal quarter follows a financial year defined by an organisation or jurisdiction.

9. Does a leap year change the calendar quarters?

No. Leap years add February 29, but the four quarter boundaries and their month groupings remain the same.

10. Can a quarter span two calendar years?

Not in the standard calendar-quarter system. Each calendar quarter begins and ends within the same calendar year.