Convert Second to Millisecond (s → ms)

Converting seconds to milliseconds is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1. 1
   Take your value in seconds

   Start with the number of seconds (s) you want to convert.
2. 2
   Multiply by 1,000

   The conversion factor from s to ms is 1,000. Multiply your value by this number.
3. 3
   Read the result in milliseconds

   The result is your value in milliseconds (ms).

Multiply the value in seconds by 1,000. For the reverse direction, multiply by 0.001.

• ✓60 s = 1 minute; 3600 s = 1 hour; 86,400 s = 1 day.
• ✓For sub-second intervals use ms (milliseconds), µs (microseconds) and ns (nanoseconds).
• ✓The symbol is s (lowercase). "sec" is informal.

• ✗Writing S instead of s for the second.
• ✗Confusing second of time with second of arc in astronomy.
• ✗Assuming microsecond and millisecond are similar — 1 ms = 1000 µs.

What is the Second?

The second is the base SI unit of time. Since 1967, it has been defined by atomic physics: the duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom. This makes the second extraordinarily reproducible — modern atomic clocks based on optical transitions can keep time to a few parts in 10¹⁸. The second is the foundation of all time measurements: the minute (60 s), the hour (3,600 s), the day (86,400 s). It is also fundamental in physics — speeds (m/s), accelerations (m/s²), frequencies (Hz = 1/s), and Planck's constant all reference the second. International civil time, GPS, and the internet's time synchronization all depend on cesium-based atomic seconds. The second relates to the millisecond (1,000 ms = 1 s), the microsecond, and the nanosecond.

• Everyday timekeeping
• Scientific and engineering measurements
• Sports timing (100 m sprint in ~10 s)

What is the Millisecond?

The millisecond equals one thousandth of a second (10⁻³ s) and is the standard unit for web latency, computer benchmarks, audio production, and high-speed photography. Human reaction time is roughly 200–250 ms, and a single video frame at 60 fps is about 16.7 ms. Internet ping times to nearby servers are typically 5–50 ms, while transcontinental pings reach 150–300 ms. The millisecond is critical in audio engineering (sound delays of more than 30 ms become perceptually noticeable), competitive gaming (frame timing matters at the millisecond level), and stock-market trading (high-frequency trading systems compete on microsecond and millisecond delays). The millisecond relates to the second (1,000 ms = 1 s), the microsecond (1,000 µs = 1 ms), and the nanosecond.

• Network latency and ping times
• Game frame rates and rendering
• Human reaction time studies