Weeks to Days Converter
1 week = 7 days
Convert Weeks (wk) to Days (d) instantly.
Conversion Formula
days = weeks x 7
To convert weeks to days, multiply by 7. The seven-day week has been used for thousands of years, likely originating from the Babylonians who associated each day with one of the seven visible celestial bodies.
Weeks to Days Table
| Weeks (wk) | Days (d) |
|---|---|
| 1 | 7 |
| 2 | 14 |
| 4 | 28 |
| 6 | 42 |
| 8 | 56 |
| 12 | 84 |
| 16 | 112 |
| 26 | 182 |
| 40 | 280 |
| 52 | 364 |
About Weeks to Days
The weeks-to-days conversion is especially important in pregnancy tracking, software development sprints, and academic scheduling.
Pregnancy is the most prominent use case. A full-term pregnancy is 40 weeks (280 days). The first trimester ends at 12 weeks (84 days). The second trimester spans weeks 13-27 (91-189 days). A baby is considered premature if born before 37 weeks (259 days).
In agile software development, sprints are typically 1-4 weeks. A 2-week sprint is 14 days (10 working days). Quarterly planning of 13 weeks equals 91 days. A "6-week build cycle" as used by Basecamp's Shape Up methodology is 42 days.
Academic semesters are measured in weeks. A typical US college semester is 15-16 weeks (105-112 days). A quarter is 10-11 weeks (70-77 days). Summer session is 6-8 weeks (42-56 days).
Military deployments are often stated in weeks or months. A 26-week deployment is 182 days (about 6 months). A standard US military deployment of 9-12 months is 39-52 weeks (273-364 days).
Fitness programs often span weeks: Couch-to-5K is 9 weeks (63 days). Marathon training plans run 12-20 weeks (84-140 days). A standard gym "newbie gains" phase lasts about 12-16 weeks (84-112 days).
Frequently Asked Questions
How many days in a week?
There are exactly 7 days in a week. This has been the standard in most cultures for thousands of years.
How many weeks is pregnancy?
A full-term pregnancy is 40 weeks (280 days), counted from the first day of the last menstrual period. This is about 9 months and 1 week.
How many weeks in a year?
There are 52 weeks and 1 day in a regular year (365 days), or 52 weeks and 2 days in a leap year (366 days).
How many days is 6 weeks?
6 weeks equals 42 days. This is a common duration for post-surgical recovery, maternity leave check-ups, and fitness program blocks.