Days to Milliseconds Converter

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

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Result in Milliseconds:

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1 d = 86,400,000 ms

Do you want to convert milliseconds to days?

How to Convert Days to Milliseconds

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To convert a measurement in days to a measurement in milliseconds, multiply the time by the following conversion ratio: 86,400,000 milliseconds/day.

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 time in days multiplied by 86,400,000.

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

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

What Is a Day?

One day is the time it takes for the Earth to complete a single 360-degree rotation about its axis. 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 d; for example, 1 day can be written as 1 d.

Learn more about days.

What Is a Millisecond?

One millisecond is equal to 1/1,000 of a second or 1,000 microseconds.

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 thousandths, or 10-3. Milliseconds can be abbreviated as ms; for example, 1 millisecond can be written as 1 ms.

Learn more about milliseconds.

Day to Millisecond Conversion Table

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

More Day & Millisecond Conversions