# How do you use dimensional analysis to figure out how many seconds are in 4 years?

##### 1 Answer

All there is behind the solution is the constant stream of multiplying. This is what dimensional analysis is all about. A conversion from one unit to another requires some sort of multiplier to change one unit to another.

Here is a list of these multipliers.

If you want to switch these, all you need to do is to divide the non-one value with itself and the 1 to find the other, vice versa solution.

From there, we are ready to move on.

1 minute = 60 seconds

1 hour = 60 minutes

24 hours = 1 day

365.25 days = 1 year (to account for leap years, the likelihood of the extra day out of 4 years is added.)

...and finally: