Find the calendar or fiscal quarter, fiscal year, start date, end date, and progress for any date.
Use calendar quarters (January–December) or set a shifted fiscal year.
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Calendar vs. Fiscal Quarters
Calendar quarters are fixed: Q1 begins January 1 and Q4 ends December 31. A fiscal quarter uses the same three-month structure but shifts Q1 to the organization’s fiscal start month.
Standard calendar-quarter dates
Quarter
Months
Usual dates
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
How shifted quarters work
Choose July as the fiscal start, for example, and Q1 becomes July–September, Q2 October–December, Q3 January–March, and Q4 April–June.
Fiscal-year naming
The same 12-month period can be named for the year in which it starts or ends. Always pair an FY label with exact dates when rules are unclear.
Common uses
Use quarter ranges for reporting deadlines, budget cycles, sales targets, project milestones, academic planning, and period-over-period analysis.
Limitations
This calculator only models four consecutive three-month quarters beginning on the first day of a month. It does not model week-based or irregular periods.
Formula and Counting Method
The quarter comes from a normalized month offset. Number January as 1 through December as 12:
fiscal month index = ((C − F + 12) mod 12), where C is the calendar month and F is the fiscal start month. The index runs from 0 to 11.
quarter = floor(fiscal month index / 3) + 1.
The fiscal-year start year is the selected date’s year when C ≥ F; otherwise it is the preceding year.
quarter start = fiscal-year start + (quarter − 1) × 3 months. The quarter end is the calendar day immediately before the start plus three months.
inclusive total days = quarter end − quarter start + 1. Gregorian month lengths automatically include February 29 in leap years.
The modular form prevents negative offsets when a fiscal year crosses New Year. Calendar mode uses F = 1.
Worked Examples
Calendar-year date: March 18, 2026
Inputs: date 2026-03-18, calendar mode (F = 1). Index ((3 − 1 + 12) mod 12) = 2, so floor(2 / 3) + 1 = Q1. The range is January 1–March 31, 2026: day 77 of 90, with 13 days after the selected date.
April-start year crossing New Year
Inputs: date 2026-03-18, April start, year-it-ends naming. Index ((3 − 4 + 12) mod 12) = 11, so the date is in Q4 of FY2026. The fiscal year is April 1, 2025–March 31, 2026; Q4 is January 1–March 31, 2026, day 77 of 90 with 13 days remaining after the date.
October-start US federal-style example
Inputs: date 2026-01-01, October start, year-it-ends naming. Index ((1 − 10 + 12) mod 12) = 3, so the date is the first day of Q2 in FY2026. The fiscal year is October 1, 2025–September 30, 2026; Q2 is January 1–March 31, 2026, day 1 of 90 with 89 later days.
Quarter boundary check
For calendar Q1 2026, January 1 returns day 1, week 1, and 89 later days. March 31 returns day 90, week 13, and 0 later days. Both boundary dates are included in the quarter.
FAQs
What quarter is today?
The calculator loads your current local date and immediately identifies its calendar or fiscal quarter. Choose Calendar Quarter for the standard answer, or Fiscal Quarter and your organization’s start month for a shifted answer.
What months are Q1, Q2, Q3, and Q4?
In a calendar year, Q1 is January–March, Q2 is April–June, Q3 is July–September, and Q4 is October–December. Fiscal quarters shift from the selected fiscal start month.
What is the difference between a calendar and fiscal quarter?
A calendar quarter is one of four fixed three-month periods in January–December. A fiscal quarter is one of four three-month periods measured from an organization’s chosen fiscal-year start month.
How is FY2026 labeled?
FY2026 may mean the fiscal year that ends in 2026 or the one that starts in 2026. Select the convention your organization uses; the result always shows the exact fiscal-year start and end dates.
How many days are in a quarter?
A standard month-based quarter has 89, 90, 91, or 92 days depending on its months and whether February falls in a leap year. The calculator counts both the quarter start and end dates.
Are weekends included?
Yes. Every calendar day is included, including Saturdays, Sundays, and holidays. This is not a business-day calculation.
Does a fiscal year have to start on January 1?
No. This calculator supports a fiscal year starting on the first day of any month. Confirm the start date and naming rule against your organization’s official calendar.
Does this support 4-4-5 calendars?
No. It supports four quarters made from three whole Gregorian calendar months each, not 4-4-5, 4-5-4, 5-4-4, 52/53-week, stub-year, 13-period, or April 6 tax-year calendars.
Methodology and Limitations
Method: The calculator uses the proleptic Gregorian calendar and groups three complete calendar months into each quarter. The IRS definition of tax years describes a calendar year as January 1–December 31 and a fiscal year as 12 consecutive months ending on the last day of a month other than December.
Check your official calendar: Tax, accounting, government, and organizational conventions vary. Verify results before filing or reporting. This tool does not calculate 4-4-5, 4-5-4, 5-4-4, 52/53-week, 13-period, stub-year, retail, or April 6 tax-year calendars.
