📏 Days to Seconds Converter
Convert days (d) to seconds (s) instantly, with the formula, a worked example and a conversion table.
Quick answer: 1 day (d) = 86,400 seconds (s). Formula: s = d × 86,400.
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Days to Seconds Converter inputs
Result
Days to Seconds conversion table
| Days (d) | Seconds (s) |
|---|---|
| 0.1 d | 8,640 s |
| 0.5 d | 43,200 s |
| 1 d | 86,400 s |
| 2 d | 172,800 s |
| 3 d | 259,200 s |
| 5 d | 432,000 s |
| 10 d | 864,000 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 |
| 1,000 d | 86,400,000 s |
Other time conversions
How to convert days to seconds
Multiply the number of days by 86,400 to get seconds: s = d × 86,400.
Example: 5 d = 432,000 s.
The day (d) and the second (s) are both units of time. Need the opposite direction? Use the s to d converter.
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Metric and imperial units
The metric system (SI) is used by almost every country and by science worldwide. Its units scale by powers of ten – 1 kilometer is 1,000 meters, 1 meter is 100 centimeters – which makes conversions inside the system easy. The imperial and US customary systems (inches, feet, pounds, gallons) are still used daily in the United States and partly in the UK.
Since 1959 the inch has been defined as exactly 2.54 centimeters and the pound as exactly 0.45359237 kilograms, so conversions between the two systems are exact. Note that a US gallon (3.785 L) and an imperial gallon (4.546 L) are different – choose the right one above.
This converter covers 10 categories and 66 units: length, weight, temperature, volume, area, speed, time, data, energy, pressure.
Frequently asked questions
How many seconds are in a day?
1 day = 86,400 seconds.
How do I convert days to seconds?
Use the formula s = d × 86,400. For example, 5 d = 432,000 s.
How do I convert seconds back to days?
1 second = 0.0000115741 days. Use the s to d converter linked on this page.
Are these conversions exact?
Yes – all factors use the internationally defined values (for example 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg exactly). Results are rounded to 8 significant digits for display.