Formula
d to s conversion formula
Use this relationship for a direct conversion:
s = d x 86,400
Worked example
2 d = 172,800 s.
Use the Date Calculators for calendar months, leap years, daylight saving transitions, and business days.
Time conversion
Convert Day to Second
1 day (d) equals 86,400 second (s). Enter any value below to convert from d to s.
Enter a value and choose units. Results update instantly.
1 d = 86,400 s
All Time units
From 1 d| Unit | Value |
|---|---|
| Nanosecond ns | 8.64e13 |
| Microsecond μs | 86,400,000,000 |
| Millisecond ms | 86,400,000 |
| Second s | 86,400 |
| Minute min | 1,440 |
| Hour h | 24 |
| Day d | 1 |
| Week wk | 0.1428571429 |
| Average Gregorian month mo | 0.0328548841 |
| Julian year a | 0.0027378508 |
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Quick reference
Day to Second table
| Day (d) | Second (s) |
|---|---|
| 0.01 | 864 |
| 0.1 | 8,640 |
| 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 |
From unit
About the day
Exactly 24 hours for elapsed-time conversion.
Symbol: d
To unit
About the second
The SI base unit of time.
Symbol: s
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Related conversions
Source
Conversion standard
Definitions are checked against BIPM SI Brochure: Units of time. Calculations use full internal precision before display rounding.
View the complete time converterQuestions
d to s FAQ
How do you convert day to second?
Use the formula s = d x 86,400. 1 day (d) equals 86,400 second (s).
Is the d to s conversion exact?
Both unit definitions use exact factors. Only the displayed decimal may be rounded.