Second (s)
The SI base unit of time.
Result
1 second = 1,000 milliseconds
Second at a glance
| Unit name | Second (plural: seconds) |
|---|---|
| Symbol | s |
| Quantity measured | Time |
| Measurement system | SI |
| Also known as | sec, secs, s |
| Definition exact? | Yes — exact by definition |
1 second in other time units
| Unit | 1 s equals |
|---|---|
| Nanosecond | 1,000,000,000 ns |
| Microsecond | 1,000,000 µs |
| Millisecond | 1,000 ms |
| Minute | 0.016666667 min |
| Hour | 0.000277778 h |
| Day | 0.000011574 d |
| Week | 0.000001653 wk |
| Month | 0.00000038 mo |
| Year | 3.16887385 × 10⁻⁸ yr |
| Decade | 3.16887385 × 10⁻⁹ dec |
| Century | 3.16887385 × 10⁻¹⁰ c |
| Millennium | 3.16887385 × 10⁻¹¹ ky |
| Fortnight | 0.000000827 fn |
Popular second conversions
Frequently asked questions
- What is a second?
- The SI base unit of time.
- What is the symbol for the second?
- The symbol for the second is s. It measures time.
- How many milliseconds are in a second?
- 1 second = 1,000 milliseconds.
- How many minutes are in a second?
- 1 second = 0.016666667 minutes.
- How many hours are in a second?
- 1 second = 0.000277778 hours.