UnitConvConvert
Time

Convert weeks to days

1 wk=7d

Use the converter below to change any weeks value into days instantly — with formula, conversion table, and real-world examples.

7

Conversion formula

Forward
days = weeks × 7
Reverse
weeks = days × 0.1429

Example: 10 wk × 7 = 70 d.

About both units

From

Week

wk

The week equals 7 days — an invention of the ancient Babylonians linked to the 7 classical planetary bodies visible to the naked eye. The 7-day week is nearly universal today, used by all major calendar systems.

Real-world: UK workweek: Mon–Fri. US payroll cycle often biweekly. Pregnancy duration: 40 weeks.
Read full week reference →
To

Day

d

The day equals 86,400 seconds — the mean time for Earth to complete one rotation relative to the Sun (solar day). A sidereal day (relative to distant stars) is about 4 minutes shorter: 23 h 56 min 4 s. Most practical usage means solar day.

Real-world: International shipping: 2–7 days typical. Global work-week: 5 days in most countries. Human circadian rhythm: 24 h ± 30 min.
Read full day reference →

Week to Day conversion table

Common weeks to days values for quick reference.

Week (wk)Day (d)
1 wk7 d
5 wk35 d
10 wk70 d
30 wk210 d
60 wk420 d
120 wk840 d
300 wk2,100 d
600 wk4,200 d
1,800 wk12,600 d
3,600 wk25,200 d

Tips & common mistakes

Quick tips

  • 1 week = 7 days = 168 hours.
  • ISO 8601 week numbering standardises "Week 01 of Year" internationally.
  • Some cultures start week on Sunday, others on Monday — check locale.

Avoid these

  • Assuming week starts on Sunday in Europe — most of Europe starts Monday.
  • Mixing fiscal weeks (e.g. 4-4-5 accounting) with calendar weeks.
  • Using "week" in science without specifying Julian or Gregorian basis — rarely matters but can.

Frequently asked questions

How many days in a week?
One week equals 7 days.
How do I convert weeks to days?
Multiply the week value by 7 to get the equivalent in days.
What is 100 weeks in days?
100 weeks equals 700 days.
Is a week bigger than a day?
Yes. 1 week equals 7 days, so one week is larger.
How to convert weeks to days without a calculator?
Multiply by 7 for a quick estimate; use a calculator for precise results.

Related time conversions

📊 See full comparison matrix →

More from Week

wk → s
1 = 604,800 s
wk → ms
1 = 604,800,000 ms
wk → min
1 = 10,080 min
wk → h
1 = 168 h
wk → mo
1 = 0.23 mo
wk → yr
1 = 0.01916 yr
wk → dec
1 = 0.001916 dec
wk → c
1 = 0.0001916 c

More to Day

s → d
1 = 1.1574e-5 d
ms → d
1 = 1.1574e-8 d
min → d
1 = 0.0006944 d
h → d
1 = 0.04167 d
mo → d
1 = 30.4369 d
yr → d
1 = 365.25 d
dec → d
1 = 3,652.5 d
c → d
1 = 36,525 d

Conversions in other categories

WeightKilogram → PoundLengthKilometer → MileTemperatureCelsius → FahrenheitVolumeLiter → US GallonAreaSquare Meter → Square FootSpeedKilometer per Hour → Mile per HourEnergyKilojoule → KilocaloriePressureBar → Pound per Square Inch