How to convert days to seconds
Days and Seconds both measure time, so converting is a single multiplication. One d equals 86,400 s, so you multiply your days value by 86,400.
Formula: seconds = days × 86,400. For example, 10 d = 864,000 s.
Days to Seconds conversion table
| Days (d) | Seconds (s) |
|---|---|
| 1 | 86,400 |
| 2 | 172,800 |
| 5 | 432,000 |
| 10 | 864,000 |
| 25 | 2,160,000 |
| 50 | 4,320,000 |
| 100 | 8,640,000 |
| 1,000 | 86,400,000 |
Days and Seconds explained
Days (d): Twenty-four hours (86,400 seconds).
Seconds (s): The SI base unit of time.
When you'd convert days to seconds
You'll convert days to seconds whenever a measurement is given in one unit but you need it in the other — comparing days and seconds figures across regions, following a recipe or spec, or double-checking a number. Because 1 d is exactly 86,400 s, the result is precise every time.
Frequently asked questions
How many seconds are in a day?
One d equals 86,400 s. Multiply your days figure by 86,400 to get seconds.
What is the formula to convert days to seconds?
seconds = days × 86,400. The factor 86,400 is exact.
What is 2 days in seconds?
2 d = 172,800 s. You can enter any value in the converter above to get an instant result.
Is this Days to Seconds converter accurate?
Yes. It uses the standard conversion factor (1 d = 86,400 s) defined by BIPM — SI Brochure (definition of the second), so results are exact to several decimal places.