Convert days to seconds
Days to seconds. Enter a value to convert, or use the days to seconds chart further down the page.
1 day equals 86,400 seconds. Going the other way, 1 second = 0.00001157407407 days.
Note. Months and years are not fixed lengths. This converter uses the average Gregorian year of 365.2425 days and the average month of one twelfth of that.
How to convert days to seconds
To convert days to seconds, multiply the day value by 86400. You can also divide by 0.00001157407407 to get the same answer.
s = d × 86400
Worked example
Convert 30 d to seconds:
30 d = 2,592,000 s
days to seconds conversion chart
Use this days to seconds table for quick reference without typing anything.
| days (d) | seconds (s) |
|---|---|
| 1 d | 86,400 s |
| 2 d | 172,800 s |
| 5 d | 432,000 s |
| 10 d | 864,000 s |
| 15 d | 1,296,000 s |
| 30 d | 2,592,000 s |
| 45 d | 3,888,000 s |
| 60 d | 5,184,000 s |
| 100 d | 8,640,000 s |
| 1,000 d | 86,400,000 s |
What is a day?
A day is exactly 86,400 seconds by definition. The Earth’s actual rotation drifts slightly from this, which is what leap seconds correct.
What is a second?
The second is the SI base unit of time, defined by 9,192,631,770 periods of the radiation of the caesium-133 atom.
Frequently asked questions
How many seconds are in a day?
1 days equals 86,400 seconds. Going the other way, 1 seconds is 0.00001157407407 days.
How do you convert days to seconds?
To convert days to seconds, multiply the day value by 86400. You can also divide by 0.00001157407407 to get the same answer.
What is 10 days in seconds?
10 days equals 864,000 seconds. The conversion chart on this page lists the other values people look up most often.
Related time conversions
Convert days to other units
- seconds to days
- days to minutes
- days to hours
- days to weeks
- days to months
- days to years
- days to milliseconds
Convert other units to seconds
- minutes to seconds
- hours to seconds
- weeks to seconds
- months to seconds
- years to seconds
- milliseconds to seconds
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