Convert days to weeks
To convert days to weeks: one day is 0.14285714 weeks, so 30 days is 4.28571 weeks. The factor is exact.
In weeks
- Conversion factor Exact.
- 1 day = 0.1428571429 weeks
- In every unit
- 2.5920e9 ms 2,592,000 s 43,200 min 720 h 30 day 4.2857 week 0.98565 month 0.082137 year
- As hours and minutes
- 720:00
- 7.25 decimal hours Multiply the fractional part by 60: 0.25 x 60 = 15 minutes.
- 7 hours 15 minutes (7:15)
- And the other way
- 7:15 is 7.25 decimal hours
- Minutes that convert cleanly
- 15 = 0.25, 30 = 0.50, 45 = 0.75
| Minutes | Decimal hours | Minutes | Decimal hours |
|---|---|---|---|
| 0 | 0 | 30 | 0.5 |
| 5 | 0.0833 | 35 | 0.5833 |
| 10 | 0.1667 | 40 | 0.6667 |
| 15 | 0.25 | 45 | 0.75 |
| 20 | 0.3333 | 50 | 0.8333 |
| 25 | 0.4167 | 55 | 0.9167 |
How the Time Converter works
One day is exactly 0.1428571429 weeks. That is a fixed convention, not a measurement: 60 seconds to the minute, 60 minutes to the hour, 24 hours to the day and 7 days to the week, with the second as the SI base unit. Leap seconds adjust the clock against the Earth's rotation; they do not change the length of a minute or an hour as a unit, so this factor is exact.
Worked through: 30 day x 0.142857143 = 4.28571 week.
Going the other way, one week is 7 days.
For mental arithmetic: Divide by 7. For a rough answer, scale from 70 days, which is exactly 10 weeks.
Divide by seven. The seven-day week is the only unit in this dimension with no astronomical basis at all. A day is a rotation and a year is an orbit, but a week is a convention, and that is why no number of weeks fits evenly into a month or a year. That is why payroll runs weekly, biweekly, semi-monthly or monthly and the four never line up: 52 weeks is 364 days, so a year is 52 weeks and a day, two in a leap year.
Precision is worth matching to the input. A measurement given as 7 day carries one or two significant figures, and reporting its conversion to six implies a precision the original never had.
Time Converter FAQ
How many weeks are in a day?
0.14285714. That is exact by convention: the units of the clock are fixed multiples of the second.
What is 30 day in weeks?
4.28571 week. Multiply by 0.14285714: 30 day x 0.142857143 = 4.28571 week.
How do I convert weeks back to days?
Divide by 0.14285714, or equivalently multiply by 7. One week is 7 days. The two factors are reciprocals, so you only need to remember one of them.
Is there a quick way to do this in my head?
Divide by 7. For a rough answer, scale from 70 days, which is exactly 10 weeks. It is close enough for everyday use.
More from the Time Converter
- weeks to days
- days to years
- months to days
- years to weeks
- years to days
- months to weeks
- weeks to months
- days to months