Months Between Dates Calculator
Compare two dates and determine the number of complete calendar months between them.
Month calculations are useful for subscriptions, age-related planning, project schedules, billing periods and other intervals that follow calendar months rather than fixed numbers of days.
Enter the two dates and calculate the complete calendar-month difference. The calculator also shows the remaining days where relevant.
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 Days Between Dates Calculator, Weeks Between Dates Calculator, Date Difference Calculator and Days Until a Date Calculator. 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 are months between dates calculated?
The calculator compares calendar years and months, then accounts for the day positions when determining complete months.
Are all months treated as the same number of days?
No. Calendar-month calculations respect the actual calendar rather than assuming every month has the same length.