About the Quarter Calculator
Which fiscal or calendar quarter a date falls in, with the quarter’s start and end dates.
Also known as: fiscal quarter calculator, what quarter is it, q1 q2 q3 q4 dates, business quarter.
How to use this calculator
- Enter date, fiscal year starts in.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
quarter = floor(months since the fiscal year start ÷ 3) + 1
Worked example
Using the values pre-filled in the calculator above:
- Date: 2026-09-22
- Fiscal year starts in: January (calendar year)
the calculator returns:
- Quarter: Q3
- Quarter starts: Wednesday, July 1, 2026
- Quarter ends: Wednesday, September 30, 2026
- Days into the quarter: 84