Weeks to Days
An instant weeks-to-days converter, with the formula and a reference table below.
| Weeks | Days |
|---|---|
| 1 wk | 7 day |
| 2 wk | 14 day |
| 3 wk | 21 day |
| 5 wk | 35 day |
| 10 wk | 70 day |
| 25 wk | 175 day |
| 50 wk | 350 day |
| 100 wk | 700 day |
How to use
- Enter a value in the Weeks field.
- The Days figure appears immediately — no button to press.
- Typing in the Days field converts back to Weeks the same way.
- Use the reference table for the values that come up most often.
Weeks to Days formula
Converting weeks to days is a single multiplication by 7.
day = wk × 7
Put another way, one week is exactly 7 days.
Why this factor: the week and the day are both defined against the second, so dividing one definition by the other gives 7 directly. Both definitions are set out in full below.
To go the other way, divide by 7 — or use the Days to Weeks converter, which is the same calculation reversed.
Worked example
Start with 15 wk. Multiply by 7 to get 105 day.
15 wk × 7 = 105 day
The converter above does this for any value you type, in either direction.
What is a week?
A week is seven days, the standard unit of work and project planning.
Definition: Exactly 604,800 seconds.
Where it is used: Sprint and project planning, payroll periods, pregnancy tracking, and lead times.
What is a day?
A day is 24 hours, one nominal rotation of the Earth.
Definition: Exactly 86,400 seconds by convention. The Earth's actual rotation drifts slightly, which is what leap seconds correct.
Where it is used: Calendars, project schedules, hotel and rental periods, and interest accrual.
Weeks vs Days
The week and the day belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many days are in a week?
One week equals 7 days.
What is the formula to convert weeks to days?
Multiply the number of weeks by 7. To reverse it, divide by 7 instead.
How do I convert days back to weeks?
Divide by 7, which is the same as multiplying by 0.142857143.
How many days are in 10 weeks?
10 wk works out to 70 day.
How is the week defined?
Exactly 604,800 seconds.