In Roblox, the 100th of a second is called a hundredth of a second, which is 0.01 seconds. A millisecond is smaller: 1/1000 of a second = 0.001 seconds.

If you mean a timer or stopwatch format in Roblox, it’s usually shown like this:

  • Seconds: 1.0
  • Hundredths: 1.00
  • Milliseconds: 1.000

So 100th of a second = 10 milliseconds.

Roblox timing note

Roblox scripts often use frame-based timing for smoother countdowns, and developer discussions note that exact millisecond timing is limited by frame rate, so “hundredths” are a more practical display format.

Example

If your timer says 12.34, the 34 part means 34 hundredths of a second.