How many sec is 500 ms?
500 ms = 0.5 sec
Rounding 0.5 sec to 1 sec is off by 100%. At this value the decimals are worth keeping.
And how many ms is 500 sec?
500 sec = 500,000 ms
Formula: sec = ms × 0.001
ms to sec around this value
50 ms0.05sec
100 ms0.1sec
150 ms0.15sec
200 ms0.2sec
250 ms0.25sec
300 ms0.3sec
350 ms0.35sec
400 ms0.4sec
450 ms0.45sec
500 ms0.5sec
550 ms0.55sec
600 ms0.6sec
650 ms0.65sec
700 ms0.7sec
750 ms0.75sec
800 ms0.8sec
850 ms0.85sec
900 ms0.9sec
950 ms0.95sec
1,000 ms1sec