Day to Second Converter
Convert days to seconds with this free time converter. The exact relationship used on this page is 1 day = 86400 seconds. Type any number — the result updates instantly, works on phones and desktops, and is ready to copy into homework, a spec sheet, or a shopping list.
Formula: Second = Day × 86400
How to convert days to seconds
- Enter the value in days in the converter.
- Read the equivalent amount in seconds.
- Use the swap link if you need second to day instead.
- Check the table for common values without typing.
Worked examples
- 1 d = 86,400 s
- 5 d = 432,000 s
- 10 d = 864,000 s
- 25 d = 2,160,000 s
Conversion table
Common days values converted to seconds.
| d | s |
|---|---|
| 1 | 86,400 |
| 2 | 172,800 |
| 3 | 259,200 |
| 4 | 345,600 |
| 5 | 432,000 |
| 6 | 518,400 |
| 7 | 604,800 |
| 8 | 691,200 |
| 9 | 777,600 |
| 10 | 864,000 |
| 20 | 1,728,000 |
| 50 | 4,320,000 |
| 100 | 8,640,000 |
| 250 | 21,600,000 |
| 500 | 43,200,000 |
| 1,000 | 86,400,000 |
About this conversion
Day (d) and Second (s) are both time units. Time converters turn seconds into hours, hours into days, and days into years using standard mean values (365. Bookmark this URL when you convert days to seconds often, then explore related pairs in the same category if you need a different target unit.
Need the other direction? Open the second to day converter.
FAQ
How many seconds are in 1 day?+
1 day equals 86400 seconds.
What is the formula to convert days to seconds?+
Second = Day × 86400
How do I convert days to seconds by hand?+
Multiply the day value by 86400. Example: 10 days × 86400 = 864000 seconds.
Is this d to s converter accurate?+
Yes. Linear conversions use internationally agreed factors relative to SI. Temperature and inverse fuel units use the standard offset or reciprocal formulas, not a guessed scale factor.