How many weeks in 21 hours?

Conversion formula

The conversion factor from hours to weeks is 0.005952380952381, which means that 1 hour is equal to 0.005952380952381 weeks:

1 hr = 0.005952380952381 wk

To convert 21 hours into weeks we have to multiply 21 by the conversion factor in order to get the time amount from hours to weeks. We can also form a simple proportion to calculate the result:

1 hr → 0.005952380952381 wk

21 hr → T_(wk)

Solve the above proportion to obtain the time T in weeks:

T_(wk) = 21 hr × 0.005952380952381 wk

T_(wk) = 0.125 wk

The final result is:

21 hr → 0.125 wk

We conclude that 21 hours is equivalent to 0.125 weeks:

21 hours = 0.125 weeks

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 week is equal to 8 × 21 hours.

Another way is saying that 21 hours is equal to 1 ÷ 8 weeks.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that twenty-one hours is approximately zero point one two five weeks:

21 hr ≅ 0.125 wk

An alternative is also that one week is approximately eight times twenty-one hours.

Conversion table

hours to weeks chart

For quick reference purposes, below is the conversion table you can use to convert from hours to weeks

hours (hr)	weeks (wk)
22 hours	0.131 weeks
23 hours	0.137 weeks
24 hours	0.143 weeks
25 hours	0.149 weeks
26 hours	0.155 weeks
27 hours	0.161 weeks
28 hours	0.167 weeks
29 hours	0.173 weeks
30 hours	0.179 weeks
31 hours	0.185 weeks

Conversion units

The units involved in this conversion are hours and weeks. This is how they are defined:

Hour

An hour (symbol: h; also abbreviated hr.) is a unit of time conventionally reckoned as 1⁄24 of a day and scientifically reckoned as 3,599–3,601 seconds, depending on conditions. The seasonal, temporal, or unequal hour was established in the ancient Near East as 1⁄12 of the night or daytime. Such hours varied by season, latitude, and weather. It was subsequently divided into 60 minutes, each of 60 seconds. Its East Asian equivalent was the shi, which was 1⁄12 of the apparent solar day; a similar system was eventually developed in Europe which measured its equal or equinoctial hour as 1⁄24 of such days measured from noon to noon. The minor variations of this unit were eventually smoothed by making it 1⁄24 of the mean solar day, based on the measure of the sun's transit along the celestial equator rather than along the ecliptic. This was finally abandoned due to the minor slowing caused by the Earth's tidal deceleration by the Moon. In the modern metric system, hours are an accepted unit of time equal to 3,600 seconds but an hour of Coordinated Universal Time (UTC) may incorporate a positive or negative leap second, making it last 3,599 or 3,601 seconds, in order to keep it within 0.9 seconds of universal time, which is based on measurements of the mean solar day at 0° longitude.

Source: Wikipedia Topic: hour

Week

A week (symbol: wk) is a time unit equal to seven days. It is the standard time period used for cycles of rest days in most parts of the world, mostly alongside—although not strictly part of—the Gregorian calendar. The days of the week were named after the classical planets (derived from the astrological system of planetary hours) in the Roman era. In English, the names are Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday.

Source: Wikipedia Topic: week