Quarter of the Year Calculator
Enter a date to find its calendar quarter (Q1–Q4), how many days into the quarter you are, and how many days remain — the figures every finance team and project manager needs.
Calendar quarters, not fiscal quarters
This calculator uses calendar quarters: Q1 = January–March, Q2 = April–June, Q3 = July–September, Q4 = October–December. Fiscal-year offsets used by some companies are not modelled here.
Leap years change Q1 length
In a leap year, Q1 (January–March) has 91 days instead of the usual 90, because February gains one day. Q2, Q3, and Q4 are unaffected.
What is a calendar quarter?
The standard four-part division of the business year
A calendar quarter divides the twelve-month Gregorian year into four equal segments of roughly 90–92 days each. Q1 runs from 1 January to 31 March, Q2 from 1 April to 30 June, Q3 from 1 July to 30 September, and Q4 from 1 October to 31 December. Quarters are the backbone of corporate financial reporting, tax filings, earnings releases, and project planning milestones worldwide — and are referred to as "Quartal" (Q1–Q4) in German business.
Enter any date to instantly see its quarter (Q1–Q4), its ordinal day within that quarter, and the number of days remaining before the quarter closes.
The quarter is determined by a simple integer formula applied to the month number. Once the quarter is known, the quarter's start date is computed in UTC, and the day-of-quarter and days-remaining figures follow from the difference in timestamps.
Quarter = floor((month − 1) ÷ 3) + 1For 17 June 2026: month 6 gives floor(5 ÷ 3) + 1 = floor(1.667) + 1 = Q2. Q2 starts on 1 April 2026 and ends on 30 June 2026. From 1 April to 17 June is 77 elapsed days, so day-of-quarter = 77 + 1 = 78. Q2 has 91 days total (April 30 + May 31 + June 30), so days remaining = 91 − 78 = 13.
Your quarter result tells you where a date sits within the annual business cycle, which is essential for meeting financial reporting deadlines and planning project phases. Q1 (January–March) is the first reporting period of the year and typically when annual targets are broken into quarterly milestones; Q2 (April–June) covers the mid-year mark and is a common deadline for half-year reviews; Q3 (July–September) is when companies begin forecasting year-end performance; and Q4 (October–December) carries the year's final push, budget closeout, and annual reporting preparation. The day-of-quarter figure shows how far into the current quarter you are — day 78 of 91, for instance, signals that roughly 86% of the quarter has elapsed and the deadline is near. The days-remaining figure is the most actionable number: it tells you exactly how many calendar days are left before the quarter turns over, letting you schedule deliverables, invoice cut-offs, or reporting windows with precision.
This tool computes calendar quarters only — it does not model fiscal-year offsets.
Fiscal quarters may differ from calendar quarters
Many companies and tax authorities define their fiscal year with a start month other than January. A company with a fiscal year starting in April, for example, treats April–June as Q1 and January–March as Q4. Government bodies such as the US federal government (fiscal year starts October) or the UK government (fiscal year starts April) also use non-calendar quarters. This calculator uses the standard calendar-year definition (Q1 = January) only — verify with your organisation's fiscal calendar before relying on the result for official reporting.