Convert Days to Seconds

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

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Results in Seconds:
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1 day = 86,400 sec
Do you want to convert seconds to days?

How to Convert Days to Seconds

Calendars document the days in a month

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.

Seconds

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

More Day Time Conversions

Convert to Centuries
1 day is equal to 2.7379E-5 centuries
Convert to Decades
1 day is equal to 0.000274 decades
Convert to Years
1 day is equal to 0.002738 years
Convert to Months
1 day is equal to 0.032855 months
Convert to Weeks
1 day is equal to 0.142857 weeks
Convert to Hours
1 day is equal to 24 hours
Convert to Minutes
1 day is equal to 1,440 minutes
Convert to Milliseconds
1 day is equal to 86,400,000 milliseconds
Convert to Microseconds
1 day is equal to 86,400,000,000 microseconds
Convert to Nanoseconds
1 day is equal to 86,400,000,000,000 nanoseconds