Days to Seconds Converter
1 day = 86,400 seconds
The calendar day is exactly 86,400 s here. Actual solar days vary by milliseconds, and leap seconds have occasionally been added to civil time.
1 day equals 86,400 seconds
How to convert days to seconds
A day here is a duration of 86,400 seconds. Unless explicitly labeled Julian, months and years use the mean Gregorian convention (365.2425 days per year; one twelfth per month), rather than the actual length of a particular calendar interval.
s = d × 86400One day is 86400 seconds, so a single multiplication converts any value.
864,000 s = 10 × 86400The calendar day is exactly 86,400 s here. Actual solar days vary by milliseconds, and leap seconds have occasionally been added to civil time.
Days to seconds conversion table
Common values in days, converted to seconds.
| Days (d) | Seconds (s) |
|---|---|
| 1 | 86,400 |
| 2 | 172,800 |
| 5 | 432,000 |
| 10 | 864,000 |
| 15 | 1,296,000 |
| 30 | 2,592,000 |
| 60 | 5,184,000 |
| 90 | 7,776,000 |
| 120 | 10,368,000 |
About these units
dayd
Exactly 24 hours, or 86,400 seconds.
seconds
The SI base unit of time, defined by the caesium-133 hyperfine transition frequency.
Reference: BIPM SI Brochure (9th ed.).
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.