To convert months to days, multiply by 30.4375.
The calculation uses 1 mo = 30.4375 d. Results are displayed to at most 10 significant digits. Definitions can be exact while a displayed decimal is rounded. Match the displayed precision to your original measurement.
Uses an average month of 365.25/12 days. Calendar months have different lengths; use a date calculator for calendar intervals.
The formula
mo- Input unit: months
d- Output unit: days
How to use this calculator
- Enter a value in mo.
- Multiply by the stored conversion factor.
- Read the result in d; divide by the same factor to convert back.
Worked examples
Worked conversion
1 mo × 30.4375 ≈ 30.4375 d.
Reverse conversion
30.4375 d ÷ 30.4375 ≈ 1 mo. Rounding intermediate values can change the last displayed digit.
Frequently asked questions
What factor does this converter use?
It uses 30.4375 d per mo. Uses an average month of 365.25/12 days. Calendar months have different lengths; use a date calculator for calendar intervals.
Why can another converter show a slightly different answer?
Check the unit convention first (such as US versus Imperial or decimal versus binary), then compare rounding. Measurement uncertainty is separate from the unit conversion.
mo to d table
| mo | d (rounded) |
|---|---|
| 0 | 0 |
| 1 | 30.4375 |
| 2 | 60.875 |
| 5 | 152.1875 |
| 10 | 304.375 |
| 100 | 3043.75 |