Weeks to Days Converter
Convert weeks to days — seven to the week. Results update as you type; exact factors shown.
One week is 7 days — see the exact factor, not a rounded rule of thumb.
How the weeks to days converter works
Time converts through the second. Minutes, hours, days and weeks are exact multiples. A month is taken as the Gregorian average (30.436875 days) and a year as the Gregorian average (365.2425 days = 31,556,952 s); calendar months and leap years vary from these averages.
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common time conversions
| From | To | Units |
|---|---|---|
| 1 wk | 7 d | week to days |
| 2 wk | 14 d | weeks to days |
| 3 wk | 21 d | weeks to days |
| 4 wk | 28 d | weeks to days |
| 6 wk | 42 d | weeks to days |
| 8 wk | 56 d | weeks to days |
| 12 wk | 84 d | weeks to days |
| 13 wk | 91 d | weeks to days |
| 26 wk | 182 d | weeks to days |
| 40 wk | 280 d | weeks to days |
| 52 wk | 364 d | weeks to days |
| 104 wk | 728 d | weeks to days |
Units in this converter and their exact factors
| Unit | Symbol | One unit in seconds |
|---|---|---|
| millisecond | ms | 0.001 second |
| second | s | 1 second |
| minute | min | 60 second |
| hour | h | 3,600 second |
| day | d | 86,400 second |
| week | wk | 604,800 second |
| month (average, 30.4369 days) | mo | 2,629,746 second |
| year (365.2425 days) | yr | 31,556,952 second |
FAQFrequently asked questions about time conversion
How many days in a week?
Seven.
How many days is 12 weeks?
84.
How many weeks in a year?
52 weeks and one day, or two days in a leap year.
How long is a pregnancy in days?
40 weeks is 280 days, which is how due dates are calculated.
How many working days in 4 weeks?
Twenty, assuming a five-day week and no holidays.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.