Convert Excel time to decimal seconds
To convert a valid Excel time into decimal seconds, you can multiply by 86400. In the example shown, the formula in C6 is:
which returns a value of 60, since there are 60 seconds in 1 minute.
How this formula works
In the Excel time system, one 24-hour day is equal to 1. This means times and hours are fractional values of 1, as shown in the table below:
Because each hour can be represented as 1/24, you can convert an Excel time into decimal hours by multiplying the value by 24, convert to decimal minutes by multiplying the value by 1440 (24 * 60) , and convert to seconds by multiplying by 86400 (24 * 60 * 60).
With the time value 6:00 cell A1, you can visualize the conversion like this:
=A1*(24*60*60) =(6/24)*86400 =0.25*86400 =21,600
The Excel time 6:00 converts to 21,600 seconds.
Format result as number
When you multiply a time value by 86400, Excel may automatically format the result using a time format like h:mm, which will display the value incorrectly. To display the result as a regular number, apply the General or Number format.