Month Calculator

The Month Calculator adds or subtracts months from any start date and shows the resulting calendar date instantly. It handles month-end edge cases like January 31 plus one month becoming February 28 or 29. Related tools: Date Calculator, Days Calculator, and Months to Years Converter.

How to Use the Month Calculator

Choose your start date.
Select whether to add or subtract months.
Enter the number of months to adjust.
View the result date and day of week immediately.

Common Examples

January 15, 2026 + 6 months = July 15, 2026
March 31, 2026 + 1 month = April 30, 2026
December 1, 2026 - 3 months = September 1, 2026

Frequently Asked Questions

How does the month calculator handle month-end dates?

If the target month has fewer days, the result moves to the last valid day of that month. For example, January 31 plus one month becomes February 28 or 29 in a leap year.

Can I subtract months from a date?

Yes. Choose the Subtract Months option and enter how many months to go back from your start date.

Does this calculator account for leap years?

Yes. Leap year rules are applied automatically when adjusting across February.

What is the difference between this and the days calculator?

The month calculator adjusts by calendar months, while the days calculator counts exact day differences between two dates.

Can I add more than 12 months at once?

Yes. Enter any whole number of months, such as 18 or 24, to project dates further into the future or past.

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Month Calculator