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Quarter Calculator

Calendar and fiscal quarter of a date, plus its day within the quarter.

By CalcHub Editorial · Last reviewed

Quick answer

  • Formula: Calendar quarter = ⌊(month − 1) ÷ 3⌋ + 1; Fiscal quarter = ⌊((month − fiscal start month) mod 12) ÷ 3⌋ + 1
  • Worked example — Calendar quarter: Q3 (full example below).

Quarter Calculator

Worked example result
Calendar quarterQ3
Fiscal quarterQ1
Fiscal year basisFiscal year starts in July
Day of calendar quarter46

August 15, 2026 is in calendar Q3 (its 46th day) but fiscal Q1 for an organization whose fiscal year starts in July.

Diagram: how the Quarter Calculator works — you enter Year, Month (1–12), Day, Fiscal year starts in; it applies the formula Calendar quarter = ⌊(month − 1) ÷ 3⌋ + 1; Fiscal quarter = ⌊((month…; and the worked example gives Calendar quarter: Q3.
How the Quarter Calculator works — the inputs, the formula, and a worked example (Calendar quarter: Q3).

Find which quarter a date falls in: the calendar quarter (Q1–Q4 of the calendar year) and the fiscal quarter for any fiscal-year start month you choose.

It also reports the day of the calendar quarter — how many days into the quarter the date sits — which is useful for reporting deadlines and pro-rata calculations.

The formula

Calendar quarter = ⌊(month − 1) ÷ 3⌋ + 1; Fiscal quarter = ⌊((month − fiscal start month) mod 12) ÷ 3⌋ + 1

Worked example

August 15, 2026 is in calendar Q3 (its 46th day) but fiscal Q1 for an organization whose fiscal year starts in July.

Worked example for the Quarter Calculator: with Year 2026, Month (1–12) 8, Day 15, the result is Calendar quarter: Q3; Fiscal quarter: Q1.
The worked example, with the example values entered and the results they give.

The example is pre-loaded in the result panel — press Calculate with your own numbers to replace it.

Frequently asked questions

Which fiscal start months are common?

Governments and companies vary: the US federal fiscal year starts in October, many retailers start in February, and plenty of firms simply match the calendar year with a January start.

How long is a quarter?

Calendar quarters run 90 to 92 days: Q1 has 90 days (91 in a leap year), Q2 has 91, and Q3 and Q4 have 92 each.

Category: Date & Time calculators

Sources & methodology

This calculator applies the formula shown on this page exactly as written, using the standard definitions for its inputs. Results are computed from the values you enter — no data is stored — and are rounded only for display.

Content last reviewed by CalcHub Editorial.

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