# How Many Microseconds in a Second

If you’re interested in learning how many microseconds there are in a second, keep reading! We’ll show you how to calculate this time unit conversion using an online calculator, and we’ll provide you with a table of common values for quick reference.

Microseconds (ms) are a very small unit of time. One microsecond is equal to 1,000 nanoseconds. The number of microseconds in a second is determined by the length of 9,192,631,770 cycles of radiation that comes from electrons moving between two energy levels of the caesium-133 atom at zero kelvins. A second is a unit of time that is used in many different types of applications and measurement systems. For example, the time it takes for light to travel from the moon to your eye is approximately one second.

Another unit of time that is commonly used in computers and electronic devices is a millisecond (ms). A millisecond is one-thousandth of a second. It is often abbreviated as ms, but is also sometimes written as msc or msec. A millisecond is the smallest unit of time that can be measured accurately, and it is commonly used to measure things such as the time required to read or write data to hard disks and solid-state drives.

The next smaller unit of time is a nanosecond (ns). A nanosecond is one billionth of a second. It is sometimes abbreviated as ns or nsec and is usually used in computer science. A nanosecond is a very short amount of time, and it can be difficult to comprehend how fast it is. For example, Admiral Grace Hopper once hand-delivered foot-long lengths of wire to attendees at her lectures on technology in order to help them understand the speed at which a computer’s memory can read or write information.