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 US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
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 Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.