Convert Days to Seconds

Enter the time in days below to get the value converted to seconds.

Results in Seconds:

1 day = 86,400 sec

How to Convert Days to Seconds

conversion scale showing days and equivalent seconds time values

To convert a day measurement to a second measurement, multiply the time by the conversion ratio. One day is equal to 86,400 seconds, so use this simple formula to convert:

seconds = days × 86,400

The time in seconds is equal to the days multiplied by 86,400.

For example, here's how to convert 5 days to seconds using the formula above.

5 day = (5 × 86,400) = 432,000 sec

Days and seconds are both units used to measure time. Keep reading to learn more about each unit of measure.

Days

One day is the time it takes for the Earth to complete a single rotation around its axis in relation to the Sun. There are 24 hours in a day.

The day is an SI accepted unit for time for use with the metric system. Days can be abbreviated as day, for example 1 day can be written as 1 day.

The second has historically been defined as 1/60 of a minute or 1/86,400 of a day. The SI defines the second 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.

The second is the SI base unit for time in the metric system. Seconds can be abbreviated as sec, for example 1 second can be written as 1 sec.

Day Measurements and Equivalent Second Conversions

Common day values converted to the equivalent second value
Days	Seconds
1 day	86,400 sec
2 day	172,800 sec
3 day	259,200 sec
4 day	345,600 sec
5 day	432,000 sec
6 day	518,400 sec
7 day	604,800 sec
8 day	691,200 sec
9 day	777,600 sec
10 day	864,000 sec
11 day	950,400 sec
12 day	1,036,800 sec
13 day	1,123,200 sec
14 day	1,209,600 sec
15 day	1,296,000 sec
16 day	1,382,400 sec
17 day	1,468,800 sec
18 day	1,555,200 sec
19 day	1,641,600 sec
20 day	1,728,000 sec
21 day	1,814,400 sec
22 day	1,900,800 sec
23 day	1,987,200 sec
24 day	2,073,600 sec
25 day	2,160,000 sec
26 day	2,246,400 sec
27 day	2,332,800 sec
28 day	2,419,200 sec
29 day	2,505,600 sec
30 day	2,592,000 sec
31 day	2,678,400 sec
32 day	2,764,800 sec
33 day	2,851,200 sec
34 day	2,937,600 sec
35 day	3,024,000 sec
36 day	3,110,400 sec
37 day	3,196,800 sec
38 day	3,283,200 sec
39 day	3,369,600 sec
40 day	3,456,000 sec