Quarter Calculator

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.

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 2026-10-21 by CalcHub Editorial.

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Quick answer