Days to Seconds Converter
Convert days to seconds instantly with this free days to seconds converter. Enter any value to get an accurate time conversion, plus the formula, the conversion factor and a full reference table.
What is 1 day in seconds?
1 day is equal to exactly 86,400 seconds.
1 × 86,400 = 86,400 seconds
Result
1 day = 86,400 seconds
Days to Seconds formula
s = d × 86,400
The days to seconds conversion factor is 86,400, which is exact by definition. 1 day = 86,400 seconds, and 1 second = 0.000011574074 days.
Worked examples
- 2 days = 172,800 seconds — 2 × 86,400 = 172,800 seconds
- 30 days = 2,592,000 seconds — 30 × 86,400 = 2,592,000 seconds
- 100 days = 8,640,000 seconds — 100 × 86,400 = 8,640,000 seconds
Days to Seconds conversion table
Every value below is calculated with the exact conversion factor and rounded for display.
| Days (d) | Seconds (s) |
|---|---|
| 1 d | 86,400 s |
| 2 d | 172,800 s |
| 5 d | 432,000 s |
| 10 d | 864,000 s |
| 15 d | 1,296,000 s |
| 30 d | 2,592,000 s |
| 45 d | 3,888,000 s |
| 60 d | 5,184,000 s |
| 90 d | 7,776,000 s |
| 100 d | 8,640,000 s |
| 365 d | 31,536,000 s |
| 1,000 d | 86,400,000 s |
When you need to convert days to seconds
- Converting durations in project plans, billing sheets and race results.
- Setting timeouts, cache lifetimes and cron intervals in software.
Common mistakes to avoid
- Dividing when you should multiply. Because 1 day = 86,400 seconds, the answer should be larger than the number you started with.
- Rounding too early. Convert first at full precision, then round the final answer to the precision the task actually needs.
How precise does the answer need to be?
Round only at the end, and only to the precision your task actually needs. The converter above keeps full double precision internally and rounds for display.
How these units are defined
- Day (d): 24 hours. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
- Second (s): The SI base unit of time. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
Related conversions
Frequently asked questions
- What is 1 day in seconds?
- 1 day is equal to 86,400 seconds.
- How many days are in one second?
- There are 0.000011574 days in 1 second.
- How do you convert days to seconds?
- Multiply the number of days by 86,400 — or use the formula s = d × 86,400.
- What is 30 days in seconds?
- 30 days is 2,592,000 seconds. 30 × 86,400 = 2,592,000 seconds.
- Is the days to seconds conversion exact?
- Yes. The relationship is fixed by definition, so 86,400 is an exact conversion factor — only the displayed result is rounded.