Conversion formula

The conversion factor from hours to seconds is 3600, which means that 1 hour is equal to 3600 seconds:

1 hr = 3600 s

To convert 420 hours into seconds we have to multiply 420 by the conversion factor in order to get the time amount from hours to seconds. We can also form a simple proportion to calculate the result:

1 hr → 3600 s

420 hr → T_(s)

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

T_(s) = 420 hr × 3600 s

T_(s) = 1512000 s

The final result is:

420 hr → 1512000 s

We conclude that 420 hours is equivalent to 1512000 seconds:

420 hours = 1512000 seconds

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 second is equal to 6.6137566137566E-7 × 420 hours.

Another way is saying that 420 hours is equal to 1 ÷ 6.6137566137566E-7 seconds.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that four hundred twenty hours is approximately one million five hundred twelve thousand seconds:

420 hr ≅ 1512000 s

An alternative is also that one second is approximately zero times four hundred twenty hours.

Conversion table

hours to seconds chart

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