Quarter Calculator
Enter any date to find which calendar quarter (Q1 through Q4) it falls in, along with that quarter's exact start and end dates.
Quarter
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Enter a date to calculate.
How the Quarter formula works
Standard calendar quarters:
Q1: January – March Q2: April – June Q3: July – September Q4: October – December
Step-by-step calculation
- Take the month of the entered date.
- Match it against the four 3-month quarter ranges.
- Return the corresponding quarter and its start/end dates for that year.
Worked example
August 4 falls in Q3 (July–September), which runs from July 1 to September 30 of that year.
Frequently asked questions
Does every business use the same quarter dates?
No — this calculator uses standard calendar quarters (Q1 starting in January). Many companies and governments use a fiscal year that starts in a different month, which shifts their internal Q1-Q4 numbering relative to the calendar quarters shown here.