Use this free months calculator to find how many whole months and extra days are between two dates.
How to use this months calculator
Select two dates and press Calculate Months. The result shows whole calendar months plus the remaining days, and the total period in days.
Common uses
Find a baby age in months, a subscription length, a rental term, or how long a project has been running.
Example
From 15 January to 15 April is exactly 3 months.
Frequently asked questions
Why do months have different lengths?
Calendar months run from 28 to 31 days, so this calculator counts whole calendar months first, then the leftover days.
Does the order of dates matter?
No. The period between the two dates is always measured.