How many days are in 1 week?

1 wk equals 7 d. This is an exact conversion factor defined by NIST.

How do I convert weeks to days?

Multiply the value in wk by the conversion factor. For example, 10 wk = 70 d. Use our calculator above for instant results.

Is the weeks to days conversion exact?

Yes, this conversion is mathematically exact based on the international definition of these units (NIST SP 811).

Can I convert weeks to days offline?

Yes! OmniConvert runs entirely in your browser — no internet connection needed after the page loads. Your data never leaves your device, ensuring complete privacy.

What is the difference between weeks and days?

Weeks (wk) and Days (d) are both units of time but belong to different measurement systems. 1 wk = 7 d. Use the converter above to switch between them instantly.

Weeks to Days (wk → d) — Free Online Converter

wk → d Reference Table

wk	d
0.001 wk	0.007 d
0.002 wk	0.014 d
0.003 wk	0.021 d
0.004 wk	0.028 d
0.005 wk	0.035 d
0.006 wk	0.042 d
0.007 wk	0.049 d
0.008 wk	0.056 d
0.009 wk	0.063 d
0.01 wk	0.07 d
0.02 wk	0.14 d
0.03 wk	0.21 d
0.04 wk	0.28 d
0.05 wk	0.35 d
0.06 wk	0.42 d
0.07 wk	0.49 d
0.08 wk	0.56 d
0.09 wk	0.63 d
0.1 wk	0.7 d
0.2 wk	1.4 d
0.3 wk	2.1 d
0.4 wk	2.8 d
0.5 wk	3.5 d
0.6 wk	4.2 d
0.7 wk	4.9 d
0.8 wk	5.6 d
0.9 wk	6.3 d
1 wk	7 d
1.5 wk	10.5 d
2 wk	14 d
2.5 wk	17.5 d
3 wk	21 d
3.5 wk	24.5 d
4 wk	28 d
4.5 wk	31.5 d
5 wk	35 d
5.5 wk	38.5 d
6 wk	42 d
6.5 wk	45.5 d
7 wk	49 d
7.5 wk	52.5 d
8 wk	56 d
8.5 wk	59.5 d
9 wk	63 d
9.5 wk	66.5 d
10 wk	70 d
11 wk	77 d
12 wk	84 d
13 wk	91 d
14 wk	98 d
15 wk	105 d
16 wk	112 d
17 wk	119 d
18 wk	126 d
19 wk	133 d
20 wk	140 d
25 wk	175 d
30 wk	210 d
35 wk	245 d
40 wk	280 d
45 wk	315 d
50 wk	350 d
55 wk	385 d
60 wk	420 d
65 wk	455 d
70 wk	490 d
75 wk	525 d
80 wk	560 d
85 wk	595 d
90 wk	630 d
95 wk	665 d
100 wk	700 d
120 wk	840 d
125 wk	875 d
130 wk	910 d
140 wk	980 d
150 wk	1050 d
160 wk	1120 d
175 wk	1225 d
180 wk	1260 d
200 wk	1400 d
225 wk	1575 d
250 wk	1750 d
275 wk	1925 d
300 wk	2100 d
350 wk	2450 d
400 wk	2800 d
450 wk	3150 d
500 wk	3500 d
600 wk	4200 d
700 wk	4900 d
750 wk	5250 d
800 wk	5600 d
900 wk	6300 d
1000 wk	7000 d
1200 wk	8400 d
1250 wk	8750 d
1500 wk	10500 d
1750 wk	12250 d
2000 wk	14000 d
2500 wk	17500 d
3000 wk	21000 d
4000 wk	28000 d
4500 wk	31500 d
5000 wk	35000 d
6000 wk	42000 d
7000 wk	49000 d
7500 wk	52500 d
8000 wk	56000 d
9000 wk	63000 d
10000 wk	70000 d
15000 wk	105000 d
20000 wk	140000 d
25000 wk	175000 d
50000 wk	350000 d
75000 wk	525000 d
100000 wk	700000 d

Values based on NIST SP 811 conversion factors

Why Convert Weeks to Days?

Converting between weeks (wk) and days (d) is one of the most common time conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert wk to d saves time and prevents errors.

Time conversion between wk and d is essential for project management, astronomy, and high-speed electronics. While day-to-day scheduling is simple, scientific and engineering fields often require converting between vast timescales (millennia) and infinitesimal ones (nanoseconds). Video editors and audio engineers work with frames and samples that require precise time unit conversions to sync media perfectly. In logistics, accurate delivery estimates depend on converting travel durations across time zones and varying speed metrics. Miscalculating time units can lead to missed deadlines, data desynchronization, or navigation errors in GPS systems.

How to Convert Weeks to Days

To convert weeks to days, use the following formula:

d = wk × 7

Example: 1 wk = 7 d

For example, 5 wk = 35 d, 10 wk = 70 d, and 100 wk = 700 d. For larger values, 1000 wk = 7000 d. Conversely, 1 d = 0.1428571429 wk. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Use Cases

Full-term pregnancy duration: 40 wk = 280 d
One week: 1 wk = 7 d
A standard two-week vacation: 2 wk = 14 d
One year: 52 wk = 364 d
Approximately one month: 4 wk = 28 d

Common Mistakes to Avoid

Decimal time: thinking 1.50 hours is 1 hour 50 minutes (it's 1 hour 30 minutes).
Leap years: assuming every year has 365 days.
Month length: assuming all months are 30 days.

Pro Tips

Excel format: Be careful converting time in Excel; it stores dates as serial numbers.
Time zones: Always specify UTC offset when scheduling international calls.
Seconds in day: There are 86,400 seconds in a standard day.

What is a Week?

A unit of time equal to 7 days.

Standard cycle for work and rest.

What is a Day?

A unit of time based on Earth's rotation, equal to 24 hours.

Basic unit for daily life and calendars.

Weeks → Days

Weeks to Days Formula