How to convert days to seconds
To convert days (d) to seconds (s), multiply the value in days by 86,400.
s = d × 86,400
Example: 5 d = 432,000 s.
You can also type 5 d to s into the smart calculator, or mix units: 1 d + 1 s.
Days to Seconds conversion table
| Days | Seconds |
|---|---|
| 0.01 d | 864 s |
| 0.1 d | 8,640 s |
| 0.25 d | 21,600 s |
| 0.5 d | 43,200 s |
| 1 d | 86,400 s |
| 2 d | 172,800 s |
| 3 d | 259,200 s |
| 4 d | 345,600 s |
| 5 d | 432,000 s |
| 6 d | 518,400 s |
| 7 d | 604,800 s |
| 8 d | 691,200 s |
| 9 d | 777,600 s |
| 10 d | 864,000 s |
| 12 d | 1,036,800 s |
| 15 d | 1,296,000 s |
| 20 d | 1,728,000 s |
| 25 d | 2,160,000 s |
| 30 d | 2,592,000 s |
| 40 d | 3,456,000 s |
| 50 d | 4,320,000 s |
| 60 d | 5,184,000 s |
| 75 d | 6,480,000 s |
| 100 d | 8,640,000 s |
| 250 d | 21,600,000 s |
| 500 d | 43,200,000 s |
| 1,000 d | 86,400,000 s |
Converting seconds back to days
1 s = 0.00001157407407 d. See the Seconds to Days converter, or press the swap button above.
About the units
Day (d)
Twenty-four hours, or 86,400 seconds.
Second (s)
The SI base unit of time, defined by 9,192,631,770 cycles of the caesium-133 hyperfine transition.
The second is the SI base unit of time, defined by the caesium-133 atom. Months and years vary in length, so this converter uses Gregorian averages: a year of 365.2425 days and a month of 30.436875 days. For exact calendar spans between two dates, use the date calculator.
Questions and answers
How many seconds are in a day?
One day (d) equals 86,400 seconds (s).
How do I convert days to seconds?
To convert days to seconds, multiply the value in days by 86,400. The formula is s = d × 86,400. For example, 5 d = 432,000 s.
What is 5 d in s?
5 days is 432,000 seconds.
Which is bigger, a day or a second?
A day is bigger: 1 d = 86,400 s.
How long is a month in this converter?
Months and years change length, so unit conversion uses Gregorian averages: a year of 365.2425 days and a month of 30.436875 days. For exact spans between two calendar dates, use the date calculator.
Does this d to s converter work offline?
Yes. ConvertEasy is a progressive web app: after your first visit it keeps working with no connection, and you can install it to your home screen from the browser menu.