How many s in 1 day?
The answer is 86400.
We assume you are converting between second and day.
You can view more details on each measurement unit: s or
day
The SI base unit for time is the second.
1 second is equal to 1.1574074074074E-5 day.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between seconds and days.
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››Date difference between calendar days

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You can do the reverse unit conversion from
day to s, or enter any two units below:

The second (symbol s) is a unit for time, and one of seven SI base units. It is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom at zero kelvins.

››Definition: Day

A continuous period of 24 hours which, unless the context otherwise requires, runs from midnight to midnight.

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