Days to Seconds ConverterRight in Your Browser
Convert days (d) to seconds (s). The day (d) is 24 hours — the natural unit for deadlines, rentals and trip lengths. The second (s) is the SI base unit of time, defined by the vibration of the cesium atom since 1967. Everything is calculated locally in your browser — no server, and it works offline.
86400 s
in seconds (second)
To convert days to seconds, multiply the day value by 86400.
Switch to Seconds to DaysDays to Seconds Chart
| Days (d) | Seconds (s) |
|---|---|
| 1 | 86400 |
| 2 | 172800 |
| 3 | 259200 |
| 4 | 345600 |
| 5 | 432000 |
| 10 | 864000 |
| 20 | 1728000 |
| 50 | 4320000 |
| 100 | 8640000 |
Frequently Asked Questions
How many seconds are in a day?
One day equals 86400 seconds (1 d = 86400 s). So to go from days to seconds, multiply the day value by 86400.
What is the formula to convert days to seconds?
To convert days to seconds, multiply the day value by 86400. For example, 10 d is 864000 s.
What is 30 days in seconds?
30 days — a typical calendar month — is 2592000 seconds. The converter above works for any value, entirely in your browser.
Is the day to second conversion exact?
The factor used here is the defined value: 1 d = 86400 s. Results are rounded to six significant digits for readability, so for high-precision work use the full factor.
Every conversion runs 100% in your browser — zero files uploaded, ever.
How to verify it yourself →