Convert Days to Seconds
1 day is 86,400 s. One day is exactly 86400 seconds.
One day is 86400 seconds. To convert days to seconds, multiply by 86400; to go the other way, divide by 86400 or multiply by 1.1574 × 10^-5. The factor is exact rather than rounded: it follows from BIPM SI Brochure. Exactly 86,400 seconds by convention.
Factor checked against the defining standard · How we check
Seconds
86,400 s
- Days × 86400
value * 8640086,400 s
1 day in every time unit
| Unit | Value | Exact factor |
|---|---|---|
| seconds | 86,400 s | × 86,400 |
| minutes | 1,440 min | × 1,440 |
| hours | 24 h | × 24 |
| days (as entered) | 1 d | — |
| weeks | 0.1428571429 wk | × 0.142857142857 |
| months | 0.03285488408 mo | × 0.0328548840839 |
| years | 0.002737907007 yr | × 0.00273790700699 |
Factors are entered by hand from BIPM SI Brochure rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert days to seconds?
- 1.Take the measurement in days.
- 2.Multiply by 86400 — that is how many seconds fit in one day.
- 3.To go back the other way, divide by 86400, or multiply by 1.1574 × 10^-5.
Days to seconds conversion table
| Days | Seconds |
|---|---|
| 1 d | 86,400 s |
| 2 d | 172,800 s |
| 3 d | 259,200 s |
| 4 d | 345,600 s |
| 5 d | 432,000 s |
| 6 d | 518,400 s |
| 7 d | 604,800 s |
| 8 d | 691,200 s |
| 9 d | 777,600 s |
| 10 d | 864,000 s |
| 12 d | 1,036,800 s |
| 15 d | 1,296,000 s |
| 20 d | 1,728,000 s |
| 25 d | 2,160,000 s |
| 50 d | 4,320,000 s |
| 100 d | 8,640,000 s |
What are days and seconds?
- Day (d)
- Exactly 86,400 seconds by convention. A solar day runs a few milliseconds long or short, which is what a leap second corrects.
- Second (s)
- The SI base unit of time, fixed since 1967 by the caesium-133 hyperfine transition frequency of 9,192,631,770 Hz.
Source: BIPM SI Brochure — the second, and units accepted for use with the SI
Questions people actually ask
- How many seconds are in a day?
- 86400. The SI base unit of time, fixed since 1967 by the caesium-133 hyperfine transition frequency of 9,192,631,770 Hz.
- How do I convert seconds back to days?
- Divide by 86400, or multiply by 1.1574 × 10^-5 — they are the same operation.
Other time conversions
Seconds to days — the same conversion the other way.