Weeks to Days Converter
Convert weeks to days and back. 1 week = 7 days exactly.
Tip: Results show up to 8 significant digits. The factors and their sources are listed on the "Where our numbers come from" page.
On this page
Weeks and Days
One week is exactly 7 days, and one day is about 0.142857142857 weeks. The converter works both ways: use the two tabs at the top of the tool to choose the direction.
Quick conversion table
Weeks to Days
| Weeks | Days |
|---|---|
| 0.5 wk | 3.5 d |
| 1 wk | 7 d |
| 2 wk | 14 d |
| 3 wk | 21 d |
| 4 wk | 28 d |
| 6 wk | 42 d |
| 8 wk | 56 d |
| 12 wk | 84 d |
| 26 wk | 182 d |
| 52 wk | 364 d |
| 104 wk | 728 d |
Days to Weeks
| Days | Weeks |
|---|---|
| 1 d | 0.14285714 wk |
| 3 d | 0.42857143 wk |
| 7 d | 1 wk |
| 10 d | 1.4285714 wk |
| 14 d | 2 wk |
| 21 d | 3 wk |
| 28 d | 4 wk |
| 30 d | 4.2857143 wk |
| 90 d | 12.857143 wk |
| 365 d | 52.142857 wk |
Exact factor and source
| Conversion | Value | Basis |
|---|---|---|
| 1 week in days | 7 | exact. 1 week = 7 days = 604,800 s (ISO 8601 week) |
| 1 day in weeks | 0.142857142857 | rounded to 12 digits. SI Brochure, 9th edition (BIPM 2019): Table 8, the day is accepted for use with the SI; 1 d = 86,400 s |
How to convert weeks to days
- Step oneTake the number of weeks.
- Step twoMultiply it by 7.
- Step threeThe result is the number of days.
- Step fourTo go back, divide by 7, or multiply by 0.142857142857.
Example: 4 wk x 7 = 28 d.
All time units compared
Each unit written in seconds, the base unit of this tool. Exact values come straight from the definitions.
| Unit | Symbol | Value in seconds |
|---|---|---|
| Seconds | s | 1 second |
| Minutes | min | 60 seconds |
| Hours | h | 3,600 seconds |
| Days | d | 86,400 seconds |
| Weeks | wk | 604,800 seconds |
What is a week?
A week (wk) is 7 days, or 168 hours.
What is a day?
A day (d) is 24 hours or 86,400 seconds. This tool counts a civil day and ignores leap seconds.
What this converter does not do
- Results are rounded for display to 8 significant digits; the stored factor is the exact one.
- A day is exactly 24 hours here: leap seconds and daylight saving shifts are ignored.
- It does not convert to calendar months or years, because they have different lengths.
Frequently asked questions
How many days are in a week?
1 week is exactly 7 days. That factor is exact by definition.
How many weeks are in a day?
1 day is about 0.142857142857 weeks.
How many days are in 52 weeks?
52 weeks is 364 days, which is 8,736 hours. A calendar year has 365 days (366 in a leap year), so 52 weeks is one day short of a common year.
Where do the factors come from?
Weeks: 1 week = 7 days = 604,800 s (ISO 8601 week). Days: SI Brochure, 9th edition (BIPM 2019): Table 8, the day is accepted for use with the SI; 1 d = 86,400 s.
References
- Weeks: 1 week = 7 days = 604,800 s (ISO 8601 week)
- Days: SI Brochure, 9th edition (BIPM 2019): Table 8, the day is accepted for use with the SI; 1 d = 86,400 s
- NIST Special Publication 811: Guide for the Use of the International System of Units (SI), 2008 edition.
- The International System of Units (SI Brochure), 9th edition, BIPM.