📅 Quarter of the Year Calculator
By ToolNimba Editorial Team · Updated 2026-06-19
Pick a date to see its quarter. The date defaults to today when you open the tool.
This calculator tells you which quarter of the year a date falls in. Pick a date (it defaults to today) and you will instantly see the calendar quarter (Q1 to Q4), the three months it covers, the exact quarter start and end dates, how far through the quarter the date sits, and how many days remain. Add a fiscal-year start month and it also works out the matching fiscal quarter, which is handy when your company or country does not run its accounts on the calendar year.
What is the Quarter of the Year Calculator?
A quarter is a three-month block, one fourth of a year, used widely in business, finance and government for reporting and planning. The calendar quarters are fixed: Q1 runs January to March, Q2 April to June, Q3 July to September, and Q4 October to December. To find the quarter from any date you only need its month: take the month number from 1 to 12, subtract 1, divide by 3, drop the remainder, and add 1. So month 5 (May) gives (5 - 1) ÷ 3 = 1 remainder 1, floor is 1, plus 1 equals Q2.
The four quarters are not all the same length, because months differ. Q1 has 90 days (91 in a leap year), Q2 has 91 days, and Q3 and Q4 each have 92 days. That matters when you measure how far through a quarter you are or how many days are left, which is why this tool reports the real start and end dates rather than assuming every quarter is 91 or 92 days. Days remaining here counts the days after your chosen date up to and including the last day of the quarter.
A fiscal quarter follows the same Q1 to Q4 pattern but is anchored to a fiscal year that may not start in January. Many organisations and governments use an April, July or October start, for example the US federal fiscal year begins on October 1. To map a date to its fiscal quarter, count how many whole months have passed since the fiscal year began, then apply the same divide-by-three rule. A date in August under an April fiscal-year start sits in fiscal Q2 (the July to September block), even though it is calendar Q3. Set the fiscal start month in this tool and it handles the wrap-around for you.
When to use it
- Checking which quarter today (or any date) falls in for reporting, OKRs or sales targets.
- Finding the exact start and end dates of a quarter so you can set deadlines or close the books.
- Seeing how many days are left in the current quarter to pace work toward a quarterly goal.
- Converting a calendar date to a fiscal quarter when your organisation uses an April, July or October fiscal-year start.
How to use the Quarter of the Year Calculator
- Pick a date, or leave it on today which is filled in automatically.
- Read off the calendar quarter (Q1 to Q4), the months it covers, and its start and end dates.
- Check the day-of-quarter and days-remaining figures to see how far through the quarter the date is.
- Optionally choose the month your fiscal year starts to also see the matching fiscal quarter.
Formula & method
Worked examples
You want the calendar quarter and days remaining for May 15, 2026.
- May is month 5, so quarter = floor((5 - 1) ÷ 3) + 1 = floor(1.33) + 1 = 2, giving Q2
- Q2 spans April, May and June, starting April 1 and ending June 30, 2026
- Q2 has 30 + 31 + 30 = 91 days
- Day of quarter = 30 (all of April) + 15 = day 45 of 91
- Days remaining = 16 (rest of May) + 30 (June) = 46 days after May 15
Result: Q2, April 1 to June 30, day 45 of 91, with 46 days remaining
Your fiscal year starts in April. You want the fiscal quarter for August 20, 2026.
- Months since the fiscal year began: August is month 8, fiscal start is month 4
- Offset = (8 - 4 + 12) mod 12 = 4 whole months elapsed
- Fiscal quarter = floor(4 ÷ 3) + 1 = 1 + 1 = 2, giving fiscal Q2
- Fiscal Q2 begins 6 months after April is wrong, it begins 3 months after April, which is July
- So fiscal Q2 covers July to September 2026
Result: Fiscal Q2, July 1 to September 30, 2026 (calendar Q3)
Calendar quarters, their months, dates and lengths (non-leap year)
| Quarter | Months | Start | End | Days |
|---|---|---|---|---|
| Q1 | January to March | Jan 1 | Mar 31 | 90 (91 in leap years) |
| Q2 | April to June | Apr 1 | Jun 30 | 91 |
| Q3 | July to September | Jul 1 | Sep 30 | 92 |
| Q4 | October to December | Oct 1 | Dec 31 | 92 |
How common fiscal-year start months map to fiscal Q1 to Q4
| Fiscal year starts | FQ1 | FQ2 | FQ3 | FQ4 |
|---|---|---|---|---|
| January (calendar) | Jan to Mar | Apr to Jun | Jul to Sep | Oct to Dec |
| April | Apr to Jun | Jul to Sep | Oct to Dec | Jan to Mar |
| July | Jul to Sep | Oct to Dec | Jan to Mar | Apr to Jun |
| October (US federal) | Oct to Dec | Jan to Mar | Apr to Jun | Jul to Sep |
Common mistakes to avoid
- Assuming every quarter is the same length. Quarters run 90 to 92 days because months vary. Q1 is the shortest at 90 days (91 in a leap year). Using a flat 91 or 92 days for day-of-quarter or days-remaining maths gives the wrong answer near the ends of a quarter.
- Mixing up calendar and fiscal quarters. A fiscal Q1 is only the same as calendar Q1 when the fiscal year starts in January. With an April or October start, a single date sits in different calendar and fiscal quarters, so always state which one you mean.
- Getting the fiscal year label backwards. Many bodies name a fiscal year by the calendar year in which it ends, not begins. A fiscal year running October 2026 to September 2027 is often called FY2027. Check the convention your organisation uses before labelling reports.
- Counting the chosen date twice in days remaining. Days remaining here means the days after your date up to the end of the quarter. If you also need to include the current day, add one. Being clear about whether endpoints are included avoids off-by-one errors.
Glossary
- Quarter
- A three-month period, one fourth of a year, numbered Q1 through Q4.
- Calendar quarter
- A quarter anchored to the calendar year: Q1 is January to March, and so on through Q4 (October to December).
- Fiscal quarter
- A quarter measured from the start of a fiscal year, which may begin in a month other than January.
- Fiscal year
- A 12-month accounting period used for budgeting and reporting that need not match the calendar year.
- Day of quarter
- The position of a date counting from the first day of its quarter, where the first day is day 1.
Frequently asked questions
What quarter is it right now?
Open the tool and it fills in today by default, then shows the current calendar quarter. As a quick rule: January to March is Q1, April to June is Q2, July to September is Q3, and October to December is Q4.
How do I work out the quarter from a date?
Take the month number from 1 to 12, subtract 1, divide by 3, drop the remainder, then add 1. For example September is month 9, so (9 - 1) ÷ 3 = 2 remainder 2, floor is 2, plus 1 equals Q3.
What is the difference between a calendar quarter and a fiscal quarter?
A calendar quarter always starts in January, April, July or October. A fiscal quarter is measured from whenever a fiscal year begins, so with an April start the first fiscal quarter is April to June, not January to March.
Why are quarters different lengths?
Each quarter is three calendar months, but months have 28 to 31 days. Q1 has 90 days (91 in a leap year), Q2 has 91, and Q3 and Q4 have 92 each. The tool uses the real dates so day counts are exact.
When does the US federal fiscal year start?
The US federal government fiscal year begins on October 1 and ends on September 30. So federal fiscal Q1 is October to December, and the fiscal year is named after the calendar year in which it ends.
How many days are left in the current quarter?
Pick the date and read the days-remaining figure, which counts the days after your date up to and including the last day of the quarter. It uses the quarter exact end date, so leap years and short months are handled correctly.