In 1 days there are 0.033333 months. Meanwhile in 1 months there are 30 days. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Months to Days calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert days to months, start by choosing the type of month you mean. Months don’t all have the same number of days, so the best method depends on your goal.
For an average month (good for estimates), use 30.44 days per month:
months = days ÷ 30.44
Example: 90 days ÷ 30.44 = 2.96 months
For a 30-day month (simple planning), use:
months = days ÷ 30
Example: 90 days ÷ 30 = 3 months
For an exact calendar conversion (best for billing, contracts, and due dates), you need a start date and end date. Count how many full months fit between the dates, then track any remaining days.
Tip: Always state the method you used, like average month or calendar months, so the result is clear.
Days to months depends on how you define a month. A calendar month can be 28, 29, 30, or 31 days. A common estimate uses the average month length of about 30.44 days (365.2425 days per year divided by 12). For a quick estimate, divide days by 30. For a more accurate average, divide days by 30.44.
Months don’t have a fixed number of days. February can have 28 or 29 days. Other months have 30 or 31 days. If you convert a time span across real calendar dates, the answer can change based on which months are included.
No. Some months have 31 days, some have 30, and February has 28 or 29. People use 30 days as a simple rule of thumb, but it’s not exact.
It depends on the month:
On average, a month is about 30.44 days. This comes from the average length of a year (about 365.2425 days) divided by 12 months.
Use this method for general planning:
Count the months and days based on the actual dates. For example, from January 15 to February 15 is 1 month, but from January 31 to February 28 is not a full month. Date-based counting follows the calendar, not a fixed day number.
A 30-day month is a fixed unit used for estimates. A calendar month is a named month like March or April, and it has a set number of days. Estimates are good for quick math. Calendar months are best for deadlines and schedules.
Using common estimates:
Using estimates:
Using estimates:
Using the average month length:
Yes, but only in small ways. Leap years add one day to February, so the year has 366 days. This changes the average days per month for that year and can affect date-to-date spans that cross February.
Use the option that fits your goal:
You can get an exact answer only when you anchor the span to real calendar dates. Without dates, “months” is not a fixed unit, so any result is an estimate.
Divide by 30 for a fast estimate. If you want a closer average, divide by 30.44. Round to the nearest tenth or quarter month to keep it simple.
The Calculate Box tool to convert days to months uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a days value in the box and have it instantly converted to months.