wikiHow Seconds to Hours Calculator To convert seconds to hours, you need to divide the number of seconds by 3600 (because there are 3600 seconds in one hour). Here is the formula: Number of hours = Number of seconds / 3600 For example, if you want to convert 7200 seconds to hours, you would use the formula as follows: Number of hours = 7200 seconds / 3600 = 2 hours So 7200 seconds is equal to 2 hours. Page