How to convert months to days
To convert a measurement in months to days, multiply the value by 30.436875. The conversion factor comes from the relationship between both units and the second.
For example, to convert 5 mo to days: 5 × 30.436875 = 152.184375 d.
What is a month?
A month here is the average Gregorian calendar month, equal to about 30.44 days (2,629,746 seconds) — one twelfth of an average year. The month originates from the lunar cycle (about 29.5 days), but calendar months were adjusted to fit the solar year. Because real months range from 28 to 31 days, an average length is used for conversions.
Common uses of months include: Loan and subscription billing; Rent and salary periods; Long-term project planning; Age and milestone tracking.
What is a day?
A day is a unit of time equal to 24 hours or 86,400 seconds, based on one full rotation of the Earth on its axis. The day is humanity's oldest natural time unit, set by the cycle of light and dark. The exact 86,400-second day is a civil convention; the true solar day varies slightly through the year.
Common uses of days include: Calendars and daily scheduling; Project timelines and deadlines; Shipping and delivery estimates; Medication dosing intervals.
Months to days worked examples
Here are some common values converted:
1 mo = 30.436875 d 5 mo = 152.184375 d 10 mo = 304.36875 d 50 mo = 1,521.8438 d 100 mo = 3,043.6875 d
Frequently asked questions
How many days are in one month?
One month (mo) equals 30.436875 days (d). Multiply any value in months by 30.436875 to convert to days.
How do I convert months to days?
Multiply the value in months by 30.436875. For example, 5 mo × 30.436875 = 152.184375 d.
How do I convert days to months?
Multiply the value in days by 0.032854884084, or divide by 30.436875. Use the swap button on the converter above to reverse the direction.
Is the month to day conversion exact?
Fixed units (second through week) are exact. Month and year use the average Gregorian calendar length (30.44 and 365.2425 days) since these vary in practice.
What is the formula for months to days?
The formula is: d = mo × 30.436875. This comes from the definition of both units relative to the second.