🗓️ Days to Months
See how many average months correspond to a span of days.
Great for project timelines, subscription plans, and any schedule that needs a month-level estimate.
90 days ≈
2.956879 months
Years: 0.246407
Weeks: 12.857143
How to Use This Calculator
Enter days
Provide the total number of days in your schedule or scenario.
Review average months
The calculator divides by 30.436875 to estimate months in the Gregorian calendar.
Check supporting units
Weeks and years provide additional context for planning and reporting.
Formula
Average Month Length = 365.25 ÷ 12 ≈ 30.436875 days
Months ≈ Days ÷ 30.436875
Years ≈ Days ÷ 365.25
Weeks = Days ÷ 7
Use the formula breakdown to confirm the calculation logic or perform the conversion manually if needed.
Full Description
Months vary between 28 and 31 days. For planning horizons, budgets, and amortization schedules, using an average month keeps your math consistent without guessing individual month lengths.
The calculator uses the Gregorian average year (365.25 days) and divides by 12 to get the mean month length. If you’re working with a specific calendar month, adjust the result to the exact number of days in that month.
Additional outputs for weeks and years help you translate the same duration into other commonly referenced time spans.
Frequently Asked Questions
Why not use 30 days per month?
A 30-day month underestimates longer months and ignores leap years. The 30.4369-day average tracks the calendar year more accurately.
Can I enter fractional days?
Yes. Partial days convert to fractional months, which is useful for precise scheduling.
What about business months?
Business calendars sometimes use 30/360 conventions. Modify the divisor to 30 if you follow that accounting method.
Does this handle leap years specifically?
Leap years are averaged into the 365.25-day year. For a single leap year, divide by 366 instead.