Time converter
Months to Days
Converting Months to Days is a single multiplication when you know the factor. One mo equals 30.4375 d, so multiply the value in mo by 30.4375. The calculator below works in both directions and accepts decimals.
Formula 1 mo = 30.4375 d
Need the other direction? Days to Months.
How to convert Months to Days
A month here is the average Julian month of 30.4375 days (2,629,800 seconds). A day is 24 hours, or 86,400 seconds, ignoring leap seconds.
To convert Months to Days, multiply the value in mo by 30.4375. For example, 10 mo × 30.4375 = 304.375 d. This works because the ratio between the two units is constant for every value in time.
Worked examples
| mo | d |
|---|---|
| 1 mo | 30.4375 d |
| 2.5 mo | 76.09375 d |
| 5 mo | 152.1875 d |
| 10 mo | 304.375 d |
| 25 mo | 760.9375 d |
| 50 mo | 1,521.88 d |
| 100 mo | 3,043.75 d |
Reverse conversion
| d | mo |
|---|---|
| 1 d | 0.03285421 mo |
| 5 d | 0.16427105 mo |
| 10 d | 0.32854209 mo |
| 25 d | 0.82135524 mo |
| 50 d | 1.64271 mo |
| 100 d | 3.285421 mo |
When this conversion is useful
This is the calculation you need when you are planning a project, a sprint or a schedule and need consistent units. Because the factor is fixed, you can use the same number for a single measurement or for a batch: 1,000 mo is 30,437.5 d.
Is the conversion exact?
Seconds, minutes, hours, days and weeks are exact. Months and years here use average Julian values (30.4375 days and 365.25 days), so a calendar conversion can differ slightly.
Reference: BIPM SI Brochure and NIST SP 811. Last reviewed: 2026-11-01.
mo to d conversion chart
The chart lists the most requested values. For a value that is not here, use the converter at the top of the page.
| Months (mo) | Days (d) |
|---|---|
| 1 mo | 30.4375 d |
| 2 mo | 60.875 d |
| 3 mo | 91.3125 d |
| 4 mo | 121.75 d |
| 5 mo | 152.1875 d |
| 6 mo | 182.625 d |
| 7 mo | 213.0625 d |
| 8 mo | 243.5 d |
| 9 mo | 273.9375 d |
| 10 mo | 304.375 d |
| 11 mo | 334.8125 d |
| 12 mo | 365.25 d |
| 13 mo | 395.6875 d |
| 14 mo | 426.125 d |
| 15 mo | 456.5625 d |
| 16 mo | 487 d |
| 17 mo | 517.4375 d |
| 18 mo | 547.875 d |
| 19 mo | 578.3125 d |
| 20 mo | 608.75 d |
| 21 mo | 639.1875 d |
| 22 mo | 669.625 d |
| 23 mo | 700.0625 d |
| 24 mo | 730.5 d |
| 25 mo | 760.9375 d |
| 26 mo | 791.375 d |
| 27 mo | 821.8125 d |
| 28 mo | 852.25 d |
| 29 mo | 882.6875 d |
| 30 mo | 913.125 d |
| 31 mo | 943.5625 d |
| 32 mo | 974 d |
| 33 mo | 1,004.44 d |
| 34 mo | 1,034.88 d |
| 35 mo | 1,065.31 d |
| 36 mo | 1,095.75 d |
| 37 mo | 1,126.19 d |
| 38 mo | 1,156.62 d |
| 39 mo | 1,187.06 d |
| 40 mo | 1,217.5 d |
| 41 mo | 1,247.94 d |
| 42 mo | 1,278.38 d |
| 43 mo | 1,308.81 d |
| 44 mo | 1,339.25 d |
| 45 mo | 1,369.69 d |
| 46 mo | 1,400.12 d |
| 47 mo | 1,430.56 d |
| 48 mo | 1,461 d |
| 49 mo | 1,491.44 d |
| 50 mo | 1,521.88 d |
| 60 mo | 1,826.25 d |
| 70 mo | 2,130.62 d |
| 80 mo | 2,435 d |
| 90 mo | 2,739.38 d |
| 100 mo | 3,043.75 d |
Frequently asked questions
How many Days are in 1 Months?
1 mo equals 30.4375 d.
How do I convert Months to Days?
Multiply the mo value by 30.4375. Example: 25 mo = 760.9375 d.
What is 2.5 mo in d?
2.5 mo = 76.09375 d.
Is the mo to d conversion exact?
Seconds, minutes, hours, days and weeks are exact. Months and years here use average Julian values (30.4375 days and 365.25 days), so a calendar conversion can differ slightly.
Does the calculator work offline?
Yes. The conversion runs in your browser with JavaScript, so it works after the page has loaded, even without a connection.