Days to Milliseconds Conversion

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

Results in Milliseconds:
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1 day = 86,400,000 ms

How to Convert Days to Milliseconds

To convert a day measurement to a millisecond measurement, multiply the time by the conversion ratio.

Since one day is equal to 86,400,000 milliseconds, you can use this simple formula to convert:

milliseconds = days × 86,400,000

The time in milliseconds is equal to the days multiplied by 86,400,000.

For example, here's how to convert 5 days to milliseconds using the formula above.
5 day = (5 × 86,400,000) = 432,000,000 ms

How Many Milliseconds Are in a Day?

There are 86,400,000 milliseconds in a day, which is why we use this value in the formula above.

1 day = 86,400,000 ms

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


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 millisecond is a multiple of the second, which is the SI base unit for time. In the metric system, "milli" is the prefix for 10-3. Milliseconds can be abbreviated as ms; for example, 1 millisecond can be written as 1 ms.

Day to Millisecond Conversion Table

Day measurements converted to milliseconds
Days Milliseconds
0.0000001 day 8.64 ms
0.0000002 day 17.28 ms
0.0000003 day 25.92 ms
0.0000004 day 34.56 ms
0.0000005 day 43.2 ms
0.0000006 day 51.84 ms
0.0000007 day 60.48 ms
0.0000008 day 69.12 ms
0.0000009 day 77.76 ms
0.00000001 day 0.864 ms
0.0000001 day 8.64 ms
0.000001 day 86.4 ms
0.00001 day 864 ms
0.0001 day 8,640 ms
0.001 day 86,400 ms
0.01 day 864,000 ms
0.1 day 8,640,000 ms
1 day 86,400,000 ms

More Day & Millisecond Conversions