How to convert months to weeks
- Take the value in months.
- Use the formula weeks = months × 4.348214286.
- For example, 1 mo is 4.35 wk.
About months and weeks
An average month is 30.4375 days (365.25 ÷ 12), which is 4.348 weeks. Multiply months by 4.348 to get weeks: 3 months is 13.04 weeks, 6 months is 26.09 weeks and 12 months is 52.18 weeks. For a quick estimate multiply by 4 and add 9%.
Contracts, leases, probation periods and parental leave are usually written in months, while pay cycles, training plans and rotas run in weeks. Real months vary from 28 to 31 days, so a given stretch of the calendar can be a day or two off the average.
Examples
- 1 mo (one average month) is 4.35 wk
- 3 mo (a 3-month probation period, an illustrative length) is 13.04 wk
- 6 mo (a six-month lease) is 26.09 wk
- 18 mo (an 18-month contract, an illustrative length) is 78.27 wk
Months to weeks chart
| Months (mo) | Weeks (wk) |
|---|---|
| 0.5 | 2.17 |
| 1 | 4.35 |
| 1.5 | 6.52 |
| 2 | 8.7 |
| 3 | 13.04 |
| 4 | 17.39 |
| 5 | 21.74 |
| 6 | 26.09 |
| 7 | 30.44 |
| 8 | 34.79 |
| 9 | 39.13 |
| Months (mo) | Weeks (wk) |
|---|---|
| 10 | 43.48 |
| 11 | 47.83 |
| 12 | 52.18 |
| 15 | 65.22 |
| 18 | 78.27 |
| 24 | 104.36 |
| 30 | 130.45 |
| 36 | 156.54 |
| 48 | 208.71 |
| 60 | 260.89 |