How this calculator works
The SI prefix milli means one thousandth, making 1 ms exactly 0.001 s. Divide by 1000 to read a millisecond timer in seconds, or multiply seconds by 1000 when configuring a timer whose input uses milliseconds.
Formula
seconds = milliseconds / 1000; milliseconds = seconds x 1000.
Worked example
A 1250 ms timeout lasts 1.25 seconds. A 0.075 second interval is 75 ms.
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Frequently asked questions
Is 100 ms one second?
No. It is 0.1 second; one second is 1000 ms.
What does a 250 ms delay mean?
It lasts one quarter of a second.
Can a millisecond have a fraction?
Yes. For example, 0.5 ms is 0.0005 s or 500 microseconds.