21 weeks in days
Result
The conversion result is: 21 weeks is equivalent to 147 days.[1]
Conversion formula
How to convert 21 weeks to days?
We know (by definition) that: 1 wk = 7 d.
We can set up a proportion to solve for the number of days.
1 wk / 21 wk = 7 d / x d
Now, we cross multiply to solve for our unknown x:
x d = (21 wk / 1 wk) * 7 d → x d = 147 d
Conclusion:
21 wk = 147 d
Conversion in the opposite direction
The inverse of the conversion factor is that 1 day is equal to 0.00680272108843537 times 21 weeks.
It can also be expressed as: 21 weeks is equal to 1 / 0.00680272108843537 days.
Approximation
An approximate numerical result would be: twenty-one weeks is about one hundred and forty-seven days, or alternatively, a day is about zero point zero one times twenty-one weeks.
Footnotes
[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).
Results may contain small errors due to the use of floating point arithmetic.