How do I convert weeks to days?

Multiply the week value by 7. So x wk × 7 = the equivalent in d.

How do I convert back from days to weeks?

Multiply the day value by 0.142857. For example, 1 d = 0.142857 wk.

Is the week bigger than the day?

Yes. 1 week is larger than 1 day — specifically 7 times larger.

Are these conversion factors exact?

Yes. The factor of 7 is derived directly from the SI definitions of week and day.

Weeks to Days Converter

1 wk = 7 d (week → day)

1 wk = 7 d

1 week equals 7 days. To convert weeks to days, multiply the week value by 7. For quick reference: 1 wk = 7 d, 5 wk = 35 d, 10 wk = 70 d, 100 wk = 700 d.

From

FormulaDays = Weeks × 7

Quick

When to use weeks → days

Weeks to days multiplies by 7. A 6-week course is 42 days; a 12-week pregnancy trimester is 84 days. The factor of 7 is exact and the conversion underlies sprint planning, gestational dating, and notice periods. Beware the "business week" — if a deadline is quoted in working weeks, multiply by 5, not 7, and account for public holidays separately rather than assuming a flat seven-day week.

How to convert weeks to days

Take your value
Start with your value in weeks.
Multiply by 7
Multiply the week value by 7. This is the exact conversion factor from weeks to days.
Read the result
The product is your value in days. For example, 5 wk × 7 = 35 d.

Conversion formula

The exact factor from weeks to days is 7.

Days = Weeks × 7

Weeks to Days conversion table

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

Conversion table from weeks to days
Weeks (wk)	Days (d)
1 wk	7 d
2 wk	14 d
3 wk	21 d
4 wk	28 d
5 wk	35 d
6 wk	42 d
7 wk	49 d
8 wk	56 d
9 wk	63 d
10 wk	70 d
15 wk	105 d
20 wk	140 d
25 wk	175 d
30 wk	210 d
45 wk	315 d
60 wk	420 d
90 wk	630 d
100 wk	700 d
120 wk	840 d
150 wk	1050 d
180 wk	1260 d
240 wk	1680 d
300 wk	2100 d
360 wk	2520 d
450 wk	3150 d
500 wk	3500 d
600 wk	4200 d
750 wk	5250 d
900 wk	6300 d
1000 wk	7000 d
1200 wk	8400 d
1500 wk	10500 d
1800 wk	12600 d
2400 wk	16800 d
3000 wk	21000 d
3600 wk	25200 d
4500 wk	31500 d
6000 wk	42000 d
7200 wk	50400 d
9000 wk	63000 d
10000 wk	70000 d
18000 wk	126000 d
36000 wk	252000 d
43200 wk	302400 d
86400 wk	604800 d
172800 wk	1209600 d
604800 wk	4233600 d
1000000 wk	7000000 d
31557600 wk	220903200 d
100000000 wk	700000000 d

Real-world reference

A standard work week is 5 working days within 1 wk. Most pregnancy stages are tracked in weeks. In days, that gives you: 1 wk = 7 d, 10 wk = 70 d, 100 wk = 700 d.

Frequently asked questions

How many days are in 1 week?: 1 week equals 7 days.
How do I convert weeks to days?: Multiply the week value by 7. So x wk × 7 = the equivalent in d.
What is 5 weeks in days?: 5 weeks equals 35 days.
What is 10 weeks in days?: 10 weeks equals 70 days.
What is 100 weeks in days?: 100 weeks equals 700 days.
How do I convert back from days to weeks?: Multiply the day value by 0.142857. For example, 1 d = 0.142857 wk.
Is the week bigger than the day?: Yes. 1 week is larger than 1 day — specifically 7 times larger.
Are these conversion factors exact?: Yes. The factor of 7 is derived directly from the SI definitions of week and day.

About the week and the day

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.

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.