Days To Seconds Conversion (day To Sec) - Inch Calculator

On this page:

Show/hide table of contents Chevron Down Icon

• Days to Seconds Converter
• How to Convert Days to Seconds
• How Many Seconds Are in a Day?
• What Is a Day?
• What Is a Second?
• Day to Second Conversion Table
• References

Person Icon By Joe Sexton

Joe is the creator of Inch Calculator and has over 20 years of experience in engineering and construction. He holds several degrees and certifications.

Full bioChevron Right Icon Link Icon Copy Link Facebook Icon Share on Facebook X Icon Share on X Pinterest Icon Share on Pinterest Cite Icon Cite ×Close dialog

Cite This Page

Sexton, J. (n.d.). Days to Seconds Converter. Inch Calculator. Retrieved December 24, 2025, from https://www.inchcalculator.com/convert/day-to-second/

How to Convert Days to Seconds

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

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

seconds = days × 86,400

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

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

seconds = (5 d × 86,400) = 432,000 s

How Many Seconds Are in a Day?

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

1 d = 86,400 s

Days and seconds 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 Second?

The second has historically been defined as 1/60 of a minute or 1/86,400 of a day. According to the SI definition, the second is the duration of 9,192,631,770 oscillations of the frequency of light emitted from the atomic transition between the two hyperfine levels of the unperturbed ground state of the caesium 133 atom.[1]

The second is the SI base unit for time in the metric system. Seconds can be abbreviated as s, and are also sometimes abbreviated as sec. For example, 1 second can be written as 1 s or 1 sec.

Learn more about seconds.

Day to Second Conversion Table

Table showing various day measurements converted to seconds.

Days	Seconds
0.0001 d	8.64 s
0.0002 d	17.28 s
0.0003 d	25.92 s
0.0004 d	34.56 s
0.0005 d	43.2 s
0.0006 d	51.84 s
0.0007 d	60.48 s
0.0008 d	69.12 s
0.0009 d	77.76 s
0.001 d	86.4 s
0.002 d	172.8 s
0.003 d	259.2 s
0.004 d	345.6 s
0.005 d	432 s
0.006 d	518.4 s
0.007 d	604.8 s
0.008 d	691.2 s
0.009 d	777.6 s
0.01 d	864 s
0.02 d	1,728 s
0.03 d	2,592 s
0.04 d	3,456 s
0.05 d	4,320 s
0.06 d	5,184 s
0.07 d	6,048 s
0.08 d	6,912 s
0.09 d	7,776 s
0.1 d	8,640 s
0.2 d	17,280 s
0.3 d	25,920 s
0.4 d	34,560 s
0.5 d	43,200 s
0.6 d	51,840 s
0.7 d	60,480 s
0.8 d	69,120 s
0.9 d	77,760 s
1 d	86,400 s

References

1. International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf

More Day & Second Conversions

Calendar IconConvert from Days

• days to centuriesChevron Right Icon
• days to decadesChevron Right Icon
• days to yearsChevron Right Icon
• days to monthsChevron Right Icon
• days to weeksChevron Right Icon
• days to hoursChevron Right Icon
• days to minutesChevron Right Icon
• days to millisecondsChevron Right Icon
• days to microsecondsChevron Right Icon
• days to nanosecondsChevron Right Icon

Clock IconConvert to Seconds

• centuries to secondsChevron Right Icon
• decades to secondsChevron Right Icon
• years to secondsChevron Right Icon
• months to secondsChevron Right Icon
• weeks to secondsChevron Right Icon
• hours to secondsChevron Right Icon
• minutes to secondsChevron Right Icon
• milliseconds to secondsChevron Right Icon
• microseconds to secondsChevron Right Icon
• nanoseconds to secondsChevron Right Icon