Calculate the number of full calendar months between two dates and see the remaining days.
Calendar-day differences, business-day counting, days-until questions and date arithmetic.
Enter the values requested above and select Calculate. Change any input to compare another scenario. The calculation runs locally in your browser and does not require an account.
January 15 to April 20 is 3 completed months plus 5 days.
Calculate completed calendar months plus remaining days between two dates. The result is intended for quick estimates, checking arithmetic and comparing scenarios. When a result affects a contract, tax filing, medical decision, building-code requirement or other high-stakes situation, verify the result with the appropriate professional or authoritative source.
January 15 to March 15 is two completed calendar months. March 15 to March 20 adds five days, so the span is 2 months and 5 days.
Completed calendar months are different from dividing the total day count by 30 or by an average month length.
For month-end dates, the calculator clamps to the last available day in shorter months. Financial agreements may use another month-counting convention.
Continue with: Days Between Dates Calculator · Weeks Between Dates Calculator
Calculate completed calendar months plus remaining days between two dates.
The calculator advances by whole calendar months first, then counts remaining days.
Yes. ERICH Calculators is free to use and does not require an account.
“Months between dates” can mean completed calendar months rather than total days divided by 30. This calculator reports full calendar months and remaining days so the result matches common date arithmetic.
See how formulas, sources and limitations are handled across ERICH Calculators.