Days in a Month Calculator
Choose a month and year to see exactly how many days it contains.
Months do not all contain the same number of days, and February changes length during leap years. This calculator gives the exact number for the month and year you select.
Select a month and year, then calculate the number of days in that calendar month.
Enter the values you want to compare or calculate, then use the result as a practical reference. The calculator runs in your browser and does not require an account.
This tool also fits into a wider set of practical utilities. Depending on what you are trying to calculate or measure next, you can continue with Leap Year Calculator, Day of the Week Calculator, Days Passed This Year and Days Remaining This Year. For the complete collection, visit the utility tools homepage and choose another tool when your task changes.
How to use this calculator
- Enter your values. Select the dates or numbers required by the calculator.
- Check the inputs. Make sure the dates are in the order and range you intend to calculate.
- Calculate the result. The result appears instantly in the calculator above without submitting a form.
- Use the result. Apply the result to your schedule, deadline, planning or date calculation.
How the calculation works
Enter the values you want to compare or calculate, then use the result as a practical reference. The calculator runs in your browser and does not require an account. The calculation is performed locally in your browser, so the page can return a result immediately after you change the inputs.
Things to know about date calculations
Calendar calculations can differ depending on whether a result is treated as an elapsed interval or an inclusive count. This site uses clear calendar-date rules and explains important assumptions where they affect the result. Business-day calculations on this page exclude weekends but do not automatically remove public holidays.
Frequently asked questions
How many days are in February?
February has 28 days in a common year and 29 days in a leap year.
How many days are in a month?
Depending on the month, a calendar month has 28, 29, 30 or 31 days.