How do I convert days to weeks?

Multiply the day value by 0.142857. So x d × 0.142857 = the equivalent in wk.

How do I convert back from weeks to days?

Multiply the week value by 7. For example, 1 wk = 7 d.

Is the day bigger than the week?

No. 1 day is smaller than 1 week. It takes 7 days to equal 1 week.

Are these conversion factors exact?

Yes. The factor of 0.142857 is derived directly from the SI definitions of day and week.

Days to Weeks Converter

1 d = 0.142857 wk

1 day equals 0.142857 weeks. To convert days to weeks, multiply the day value by 0.142857. For quick reference: 1 d = 0.142857 wk, 5 d = 0.714286 wk, 10 d = 1.42857 wk, 100 d = 14.2857 wk.

From

0.142857

FormulaWeeks = Days × 0.142857

Quick

How to convert days to weeks

Take your value
Start with your value in days.
Multiply by 0.142857
Multiply the day value by 0.142857. This is the exact conversion factor from days to weeks.
Read the result
The product is your value in weeks. For example, 5 d × 0.142857 = 0.714286 wk.

Conversion formula

The exact factor from days to weeks is 0.142857.

Weeks = Days × 0.142857

Days to Weeks conversion table

Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.

Conversion table from days to weeks
Days (d)	Weeks (wk)
1 d	0.14286 wk
2 d	0.28571 wk
3 d	0.42857 wk
4 d	0.57143 wk
5 d	0.71429 wk
6 d	0.85714 wk
7 d	1 wk
8 d	1.1429 wk
9 d	1.2857 wk
10 d	1.4286 wk
15 d	2.1429 wk
20 d	2.8571 wk
25 d	3.5714 wk
30 d	4.2857 wk
45 d	6.4286 wk
60 d	8.5714 wk
90 d	12.857 wk
100 d	14.286 wk
120 d	17.143 wk
150 d	21.429 wk
180 d	25.714 wk
240 d	34.286 wk
300 d	42.857 wk
360 d	51.429 wk
450 d	64.286 wk
500 d	71.429 wk
600 d	85.714 wk
750 d	107.14 wk
900 d	128.57 wk
1000 d	142.86 wk
1200 d	171.43 wk
1500 d	214.29 wk
1800 d	257.14 wk
2400 d	342.86 wk
3000 d	428.57 wk
3600 d	514.29 wk
4500 d	642.86 wk
6000 d	857.14 wk
7200 d	1028.6 wk
9000 d	1285.7 wk
10000 d	1428.6 wk
18000 d	2571.4 wk
36000 d	5142.9 wk
43200 d	6171.4 wk
86400 d	12343 wk
172800 d	24686 wk
604800 d	86400 wk
1000000 d	142857 wk
31557600 d	4508229 wk
100000000 d	14285714 wk

Real-world reference

One Earth rotation is 1 d. A standard rental period is often 1 d. In weeks, that gives you: 1 d = 0.142857 wk, 10 d = 1.42857 wk, 100 d = 14.2857 wk.

Frequently asked questions

How many weeks are in 1 day?: 1 day equals 0.142857 weeks.
How do I convert days to weeks?: Multiply the day value by 0.142857. So x d × 0.142857 = the equivalent in wk.
What is 5 days in weeks?: 5 days equals 0.714286 weeks.
What is 10 days in weeks?: 10 days equals 1.42857 weeks.
What is 100 days in weeks?: 100 days equals 14.2857 weeks.
How do I convert back from weeks to days?: Multiply the week value by 7. For example, 1 wk = 7 d.
Is the day bigger than the week?: No. 1 day is smaller than 1 week. It takes 7 days to equal 1 week.
Are these conversion factors exact?: Yes. The factor of 0.142857 is derived directly from the SI definitions of day and week.

About the day and the week

The day

The day (d) equals exactly 86,400 seconds, or 24 hours. This is the conventional 'civil' day used in calendars and contracts. The actual solar day (one full rotation of Earth relative to the Sun) varies slightly throughout the year; the difference is reconciled in atomic time scales using leap seconds.

The week

The week (wk) equals exactly 7 days, or 604,800 seconds. It is universally used as a planning unit across cultures even though it has no astronomical basis — its origin is religious and cultural, traced back to ancient Babylonian, Jewish, and Roman traditions.