Month Calculator
About the Month Calculator
Leases quote three months notice, subscriptions bill in monthly cycles, and HR tenure reads in years and months-not just a flat day count. This month calculator measures the span between two dates as completed calendar months plus leftover days, mirroring how people describe durations in contracts and employment records. From 15 March to 20 June you get three months and five days, not merely ninety-seven days that ignore month boundaries. The algorithm borrows days across uneven month lengths, so January 31 to February 28 produces sensible month-and-day output instead of off-by-one surprises.
How to use it
- Enter the start date-the earlier boundary of the period.
- Enter the end date-the later boundary.
- Click Calculate months to get months plus remaining days.
- Review detail chips for total days if you need a cross-check.
- Copy the breakdown for contracts, HR files, or billing notes.
Good to know
Results are calendar math from the dates you enter. Business-day tools skip weekends when they say so. They do not know local holidays unless the page says they do.
Frequently asked questions
Is the Month Calculator free?
Yes. You can use it in your browser with no account and no download.
How does the month calculator differ from the day counter?
It expresses the span as calendar months plus leftover days instead of a single day total.
Are partial months rounded up?
No. Only fully completed months count; remaining days are reported separately.
What if the end date is before the start date?
The tool shows an error. Swap dates for a forward span.
Does it handle February and leap years?
Yes. Month lengths including February 28/29 are respected during borrowing.
Related
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