Convert days to weeks instantly. Type a value below to see the result, or press Swap direction to convert weeks back to days. The tool uses the exact conversion factor, and a quick-reference table is below.
Weeks
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Conversion formula
Weeks = days ÷ 7
Divide by 7. 30 days is 4 weeks and 2 days, or 4.29 weeks.
Quick reference table
| Days (d) | Weeks (wk) |
|---|---|
| 1 d | 0.142857 wk |
| 3 d | 0.428571 wk |
| 7 d | 1 wk |
| 10 d | 1.42857 wk |
| 14 d | 2 wk |
| 21 d | 3 wk |
| 28 d | 4 wk |
| 30 d | 4.28571 wk |
| 60 d | 8.57143 wk |
| 90 d | 12.8571 wk |
Frequently asked questions
How do I convert days to weeks?
Weeks = days ÷ 7
How do I convert weeks back to days?
Use the reverse formula, or press Swap direction in the converter above. You can also use our reverse converter.
How many weeks is 90 days?
90 days is about 12.86 weeks, or 12 weeks and 6 days.
More free tools: Reverse converter · Unit converter · All free tools
Conversions use standard factors. Check critical measurements.