Conversion formula

The conversion factor from hours to days is 0.041666666666667, which means that 1 hour is equal to 0.041666666666667 days:

1 hr = 0.041666666666667 d

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

1 hr → 0.041666666666667 d

21 hr → T_(d)

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

T_(d) = 21 hr × 0.041666666666667 d

T_(d) = 0.875 d

The final result is:

21 hr → 0.875 d

We conclude that 21 hours is equivalent to 0.875 days:

21 hours = 0.875 days

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 day is equal to 1.1428571428571 × 21 hours.

Another way is saying that 21 hours is equal to 1 ÷ 1.1428571428571 days.

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 eight seven five days:

21 hr ≅ 0.875 d

An alternative is also that one day is approximately one point one four three times twenty-one hours.

Conversion table

hours to days chart

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