Months Between Dates
Calculate the exact number of months between two dates with decimal precision.
Results
How many months between two dates? This calculator is useful for lease duration calculations, subscription billing periods, employment length, loan terms and age-related milestones. Enter your start and end dates to get both whole months and a precise decimal month count that accounts for varying month lengths.
Explore all our date difference calculator tools, or browse the full time and date converters & calculators.
Frequently asked questions
The calculator counts full calendar months between dates, then shows a decimal value using 30.4375 days per month (the average month length). For example, January 15 to April 20 is 3 whole months and about 3.16 decimal months.
Standard leases are 12 months (1 year). Short-term leases run 3-6 months, while long-term leases can be 18-24 months. Enter your lease start and end dates to verify the exact month count for rent calculations.
Enter the loan start date and payoff date. A 30-year mortgage is 360 months, a 15-year mortgage is 180 months, and a 5-year car loan is 60 months. This tool helps verify the exact count between custom dates.
Months have 28-31 days, so 'one month' is not a fixed duration. January 31 plus one month could be February 28 or March 2 depending on interpretation. Our calculator uses calendar months for whole counts and the 30.4375-day average for decimals.
Enter today's date as the start and December 31 as the end date. From July 1, that is 6 months. From September 15, about 3.5 months.