What Is a Quarter Calculator?
A Quarter Calculator identifies which calendar quarter
contains a specific date. A standard calendar year is divided
into four quarters, with each quarter containing three months.
The calculator also shows the quarter's starting date,
ending date, total number of days, elapsed days, remaining
days, and percentage progress.
Example:
Date: August 15, 2026
August is month 8.
8 ÷ 3 = 2.67, rounded upward to 3.
Therefore, August 15, 2026 falls in
Q3 2026.
Calendar Quarter Dates
Standard calendar quarters divide January through December
into four three-month periods.
| Quarter |
Months |
Start Date |
End Date |
| Q1 |
January – March |
January 1 |
March 31 |
| Q2 |
April – June |
April 1 |
June 30 |
| Q3 |
July – September |
July 1 |
September 30 |
| Q4 |
October – December |
October 1 |
December 31 |
What Are Q1, Q2, Q3, and Q4?
Q1 — First Quarter
Q1 covers January, February, and March. It starts on
January 1 and ends on March 31.
Q2 — Second Quarter
Q2 covers April, May, and June. It starts on April 1
and ends on June 30.
Q3 — Third Quarter
Q3 includes July, August, and September. It starts on
July 1 and ends on September 30.
Q4 — Fourth Quarter
Q4 includes October, November, and December. It starts on
October 1 and ends on December 31.
How Many Days Are in a Quarter?
The number of days in a quarter depends on the months
included and whether the year is a leap year.
- Q1 normally contains 90 days.
- Q1 contains 91 days during a leap year.
- Q2 contains 91 days.
- Q3 contains 92 days.
- Q4 contains 92 days.
The calculator determines the actual number automatically
for the selected year.
Quarter Progress Calculator
Quarter progress measures how much of the selected quarter
has passed as of the chosen date.
Formula:
Quarter Progress =
(Days Elapsed ÷ Total Days in Quarter) × 100
For example, if 46 days have elapsed in a 92-day quarter,
the quarter is 50% complete.
Calendar Quarter vs Fiscal Quarter
A calendar quarter follows the standard January-to-December
calendar. A fiscal quarter depends on when an organization's
fiscal year begins.
This Quarter Calculator uses standard calendar quarters.
For a business with a non-calendar accounting year, a
Fiscal Year Calculator can be used to identify its fiscal
quarter instead.
Frequently Asked Questions
How do I calculate the quarter from a date?
Take the month number, divide it by 3, and round the result
up to the next whole number. The result is the calendar
quarter.
What months are in Q1?
Q1 consists of January, February, and March.
What months are in Q2?
Q2 consists of April, May, and June.
What months are in Q3?
Q3 consists of July, August, and September.
What months are in Q4?
Q4 consists of October, November, and December.
How many quarters are in a year?
There are four standard calendar quarters in one year.
Each quarter contains three months.
Does Q1 always have 90 days?
No. Q1 normally has 90 days, but it has 91 days when
February contains 29 days in a leap year.
Is a fiscal quarter the same as a calendar quarter?
Not always. Fiscal quarters depend on the organization's
fiscal-year start date, while calendar quarters always
follow January through December.